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<html><head><title>QString Class Reference</title><style>h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm }
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</style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr /><td align="left" valign="top" width="32"><img align="left" border="0" height="32" src="images/rb-logo.png" width="32" /></td><td width="1">  </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a></td></table><h1 align="center">QString Class Reference<br /><sup><sup>[<a href="qtcore.html">QtCore</a> module]</sup></sup></h1><p>The QString class provides a Unicode character string. <a href="#details">More...</a></p>
<h3>Types</h3><ul><li><div class="fn" />enum <b><a href="qstring.html#NormalizationForm-enum">NormalizationForm</a></b> { NormalizationForm_D, NormalizationForm_C, NormalizationForm_KD, NormalizationForm_KC }</li><li><div class="fn" />enum <b><a href="qstring.html#SectionFlag-enum">SectionFlag</a></b> { SectionDefault, SectionSkipEmpty, SectionIncludeLeadingSep, SectionIncludeTrailingSep, SectionCaseInsensitiveSeps }</li><li><div class="fn" />class <b><a href="qstring-sectionflags.html">SectionFlags</a></b></li><li><div class="fn" />enum <b><a href="qstring.html#SplitBehavior-enum">SplitBehavior</a></b> { KeepEmptyParts, SkipEmptyParts }</li></ul><h3>Methods</h3><ul><li><div class="fn" /><b><a href="qstring.html#QString">__init__</a></b> (<i>self</i>)</li><li><div class="fn" /><b><a href="qstring.html#QString">__init__</a></b> (<i>self</i>, QKeySequence)</li><li><div class="fn" /><b><a href="qstring.html#QString">__init__</a></b> (<i>self</i>, QScriptString)</li><li><div class="fn" /><b><a href="qstring.html#QString-2">__init__</a></b> (<i>self</i>, int <i>size</i>, QChar <i>c</i>)</li><li><div class="fn" /><b><a href="qstring.html#QString-3">__init__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" /><b><a href="qstring.html#QString-4">__init__</a></b> (<i>self</i>, QByteArray <i>a</i>)</li><li><div class="fn" /><b><a href="qstring.html#QString-5">__init__</a></b> (<i>self</i>, QUuid)</li><li><div class="fn" />QString <b><a href="qstring.html#append">append</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#append-2">append</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#append-3">append</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg">arg</a></b> (<i>self</i>, int <i>a</i>, int <i>fieldWidth</i> = 0, int <i>base</i> = 10, QChar <i>fillChar</i> = QLatin1Char(' '))</li><li><div class="fn" />QString <b><a href="qstring.html#arg-2">arg</a></b> (<i>self</i>, float <i>a</i>, int <i>fieldWidth</i> = 0, str <i>format</i> = 'g', int <i>precision</i> = -1, QChar <i>fillChar</i> = QLatin1Char(' '))</li><li><div class="fn" />QString <b><a href="qstring.html#arg-3">arg</a></b> (<i>self</i>, int <i>a</i>, int <i>fieldWidth</i> = 0, int <i>base</i> = 10, QChar <i>fillChar</i> = QLatin1Char(' '))</li><li><div class="fn" />QString <b><a href="qstring.html#arg-4">arg</a></b> (<i>self</i>, int <i>a</i>, int <i>fieldWidth</i> = 0, int <i>base</i> = 10, QChar <i>fillChar</i> = QLatin1Char(' '))</li><li><div class="fn" />QString <b><a href="qstring.html#arg-5">arg</a></b> (<i>self</i>, QString <i>a</i>, int <i>fieldWidth</i> = 0, QChar <i>fillChar</i> = QLatin1Char(' '))</li><li><div class="fn" />QString <b><a href="qstring.html#arg-6">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg-7">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg-8">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg-9">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg-10">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg-11">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>, QString <i>a7</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg-12">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>, QString <i>a7</i>, QString <i>a8</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#arg-13">arg</a></b> (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>, QString <i>a7</i>, QString <i>a8</i>, QString <i>a9</i>)</li><li><div class="fn" />QChar <b><a href="qstring.html#at">at</a></b> (<i>self</i>, int <i>i</i>)</li><li><div class="fn" />int <b><a href="qstring.html#capacity">capacity</a></b> (<i>self</i>)</li><li><div class="fn" /><b><a href="qstring.html#chop">chop</a></b> (<i>self</i>, int <i>n</i>)</li><li><div class="fn" /><b><a href="qstring.html#clear">clear</a></b> (<i>self</i>)</li><li><div class="fn" />int <b><a href="qstring.html#compare">compare</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />int <b><a href="qstring.html#compare-2">compare</a></b> (<i>self</i>, QString <i>s</i>, Qt.CaseSensitivity <i>cs</i>)</li><li><div class="fn" />int <b><a href="qstring.html#compare-3">compare</a></b> (<i>self</i>, QLatin1String <i>other</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#compare-4">compare</a></b> (<i>self</i>, QStringRef <i>ref</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />bool <b><a href="qstring.html#contains">contains</a></b> (<i>self</i>, QString <i>str</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />bool <b><a href="qstring.html#contains-2">contains</a></b> (<i>self</i>, QStringRef <i>s</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />bool <b><a href="qstring.html#contains-3">contains</a></b> (<i>self</i>, QRegExp <i>rx</i>)</li><li><div class="fn" />int <b><a href="qstring.html#count">count</a></b> (<i>self</i>)</li><li><div class="fn" />int <b><a href="qstring.html#count-2">count</a></b> (<i>self</i>, QString <i>str</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#count-3">count</a></b> (<i>self</i>, QStringRef <i>str</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#count-4">count</a></b> (<i>self</i>, QRegExp)</li><li><div class="fn" />bool <b><a href="qstring.html#endsWith">endsWith</a></b> (<i>self</i>, QString <i>s</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />bool <b><a href="qstring.html#endsWith-2">endsWith</a></b> (<i>self</i>, QStringRef <i>s</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />bool <b><a href="qstring.html#endsWith-3">endsWith</a></b> (<i>self</i>, QLatin1String <i>s</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />QString <b><a href="qstring.html#fill">fill</a></b> (<i>self</i>, QChar <i>ch</i>, int <i>size</i> = -1)</li><li><div class="fn" />int <b><a href="qstring.html#indexOf">indexOf</a></b> (<i>self</i>, QString <i>str</i>, int <i>from</i> = 0, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#indexOf-2">indexOf</a></b> (<i>self</i>, QStringRef <i>str</i>, int <i>from</i> = 0, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#indexOf-3">indexOf</a></b> (<i>self</i>, QLatin1String <i>str</i>, int <i>from</i> = 0, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#indexOf-4">indexOf</a></b> (<i>self</i>, QRegExp <i>rx</i>, int <i>from</i> = 0)</li><li><div class="fn" />QString <b><a href="qstring.html#insert">insert</a></b> (<i>self</i>, int <i>i</i>, QString <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#insert-2">insert</a></b> (<i>self</i>, int <i>i</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#isEmpty">isEmpty</a></b> (<i>self</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#isNull">isNull</a></b> (<i>self</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#isRightToLeft">isRightToLeft</a></b> (<i>self</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#isSimpleText">isSimpleText</a></b> (<i>self</i>)</li><li><div class="fn" />int <b><a href="qstring.html#lastIndexOf">lastIndexOf</a></b> (<i>self</i>, QString <i>str</i>, int <i>from</i> = -1, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#lastIndexOf-2">lastIndexOf</a></b> (<i>self</i>, QStringRef <i>str</i>, int <i>from</i> = -1, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#lastIndexOf-3">lastIndexOf</a></b> (<i>self</i>, QLatin1String <i>str</i>, int <i>from</i> = -1, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#lastIndexOf-4">lastIndexOf</a></b> (<i>self</i>, QRegExp <i>rx</i>, int <i>from</i> = -1)</li><li><div class="fn" />QString <b><a href="qstring.html#left">left</a></b> (<i>self</i>, int <i>len</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#leftJustified">leftJustified</a></b> (<i>self</i>, int <i>width</i>, QChar <i>fillChar</i> = QLatin1Char(' '), bool <i>truncate</i> = False)</li><li><div class="fn" />int <b><a href="qstring.html#length">length</a></b> (<i>self</i>)</li><li><div class="fn" />int <b><a href="qstring.html#localeAwareCompare">localeAwareCompare</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />int <b><a href="qstring.html#localeAwareCompare-2">localeAwareCompare</a></b> (<i>self</i>, QStringRef <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#mid">mid</a></b> (<i>self</i>, int <i>position</i>, int <i>n</i> = -1)</li><li><div class="fn" />QString <b><a href="qstring.html#normalized">normalized</a></b> (<i>self</i>, NormalizationForm <i>mode</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#normalized-2">normalized</a></b> (<i>self</i>, NormalizationForm <i>mode</i>, QChar.UnicodeVersion <i>version</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#prepend">prepend</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#prepend-2">prepend</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#prepend-3">prepend</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" /><b><a href="qstring.html#push_back">push_back</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" /><b><a href="qstring.html#push_front">push_front</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#remove">remove</a></b> (<i>self</i>, int <i>i</i>, int <i>len</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#remove-2">remove</a></b> (<i>self</i>, QString <i>str</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />QString <b><a href="qstring.html#remove-3">remove</a></b> (<i>self</i>, QRegExp <i>rx</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#repeated">repeated</a></b> (<i>self</i>, int <i>times</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#replace">replace</a></b> (<i>self</i>, int <i>i</i>, int <i>len</i>, QString <i>after</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#replace-2">replace</a></b> (<i>self</i>, QString <i>before</i>, QString <i>after</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />QString <b><a href="qstring.html#replace-3">replace</a></b> (<i>self</i>, QRegExp <i>rx</i>, QString <i>after</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#replace-4">replace</a></b> (<i>self</i>, QLatin1String <i>before</i>, QLatin1String <i>after</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />QString <b><a href="qstring.html#replace-5">replace</a></b> (<i>self</i>, QLatin1String <i>before</i>, QString <i>after</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />QString <b><a href="qstring.html#replace-6">replace</a></b> (<i>self</i>, QString <i>before</i>, QLatin1String <i>after</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" /><b><a href="qstring.html#reserve">reserve</a></b> (<i>self</i>, int <i>asize</i>)</li><li><div class="fn" /><b><a href="qstring.html#resize">resize</a></b> (<i>self</i>, int <i>size</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#right">right</a></b> (<i>self</i>, int <i>len</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#rightJustified">rightJustified</a></b> (<i>self</i>, int <i>width</i>, QChar <i>fillChar</i> = QLatin1Char(' '), bool <i>truncate</i> = False)</li><li><div class="fn" />QString <b><a href="qstring.html#section">section</a></b> (<i>self</i>, QString <i>sep</i>, int <i>start</i>, int <i>end</i> = -1, SectionFlags <i>flags</i> = QString.SectionDefault)</li><li><div class="fn" />QString <b><a href="qstring.html#section-2">section</a></b> (<i>self</i>, QRegExp <i>reg</i>, int <i>start</i>, int <i>end</i> = -1, SectionFlags <i>flags</i> = QString.SectionDefault)</li><li><div class="fn" />QString <b><a href="qstring.html#setNum">setNum</a></b> (<i>self</i>, int <i>n</i>, int <i>base</i> = 10)</li><li><div class="fn" />QString <b><a href="qstring.html#setNum-2">setNum</a></b> (<i>self</i>, float <i>n</i>, str <i>format</i> = 'g', int <i>precision</i> = 6)</li><li><div class="fn" />QString <b><a href="qstring.html#setNum-3">setNum</a></b> (<i>self</i>, int <i>n</i>, int <i>base</i> = 10)</li><li><div class="fn" />QString <b><a href="qstring.html#setNum-4">setNum</a></b> (<i>self</i>, int <i>n</i>, int <i>base</i> = 10)</li><li><div class="fn" />QString <b><a href="qstring.html#simplified">simplified</a></b> (<i>self</i>)</li><li><div class="fn" />int <b><a href="qstring.html#size">size</a></b> (<i>self</i>)</li><li><div class="fn" />QStringList <b><a href="qstring.html#split">split</a></b> (<i>self</i>, QString <i>sep</i>, SplitBehavior <i>behavior</i> = QString.KeepEmptyParts, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />QStringList <b><a href="qstring.html#split-2">split</a></b> (<i>self</i>, QRegExp <i>sep</i>, SplitBehavior <i>behavior</i> = QString.KeepEmptyParts)</li><li><div class="fn" /><b><a href="qstring.html#squeeze">squeeze</a></b> (<i>self</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#startsWith">startsWith</a></b> (<i>self</i>, QString <i>s</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />bool <b><a href="qstring.html#startsWith-2">startsWith</a></b> (<i>self</i>, QStringRef <i>s</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />bool <b><a href="qstring.html#startsWith-3">startsWith</a></b> (<i>self</i>, QLatin1String <i>s</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" /><b><a href="qstring.html#swap">swap</a></b> (<i>self</i>, QString <i>other</i>)</li><li><div class="fn" />QByteArray <b><a href="qstring.html#toAscii">toAscii</a></b> (<i>self</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#toCaseFolded">toCaseFolded</a></b> (<i>self</i>)</li><li><div class="fn" />(float, bool <i>ok</i>) <b><a href="qstring.html#toDouble">toDouble</a></b> (<i>self</i>)</li><li><div class="fn" />(float, bool <i>ok</i>) <b><a href="qstring.html#toFloat">toFloat</a></b> (<i>self</i>)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toInt">toInt</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />QByteArray <b><a href="qstring.html#toLatin1">toLatin1</a></b> (<i>self</i>)</li><li><div class="fn" />QByteArray <b><a href="qstring.html#toLocal8Bit">toLocal8Bit</a></b> (<i>self</i>)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toLong">toLong</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toLongLong">toLongLong</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />QString <b><a href="qstring.html#toLower">toLower</a></b> (<i>self</i>)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toShort">toShort</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toUInt">toUInt</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toULong">toULong</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toULongLong">toULongLong</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />QString <b><a href="qstring.html#toUpper">toUpper</a></b> (<i>self</i>)</li><li><div class="fn" />(int, bool <i>ok</i>) <b><a href="qstring.html#toUShort">toUShort</a></b> (<i>self</i>, int <i>base</i> = 10)</li><li><div class="fn" />QByteArray <b><a href="qstring.html#toUtf8">toUtf8</a></b> (<i>self</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#trimmed">trimmed</a></b> (<i>self</i>)</li><li><div class="fn" /><b><a href="qstring.html#truncate">truncate</a></b> (<i>self</i>, int <i>pos</i>)</li></ul><h3>Static Methods</h3><ul><li><div class="fn" />int <b><a href="qstring.html#compare-5">compare</a></b> (QString <i>s1</i>, QString <i>s2</i>)</li><li><div class="fn" />int <b><a href="qstring.html#compare-6">compare</a></b> (QString <i>s1</i>, QString <i>s2</i>, Qt.CaseSensitivity <i>cs</i>)</li><li><div class="fn" />int <b><a href="qstring.html#compare-7">compare</a></b> (QString <i>s1</i>, QLatin1String <i>s2</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#compare-8">compare</a></b> (QLatin1String <i>s1</i>, QString <i>s2</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />int <b><a href="qstring.html#compare-9">compare</a></b> (QString <i>s1</i>, QStringRef <i>s2</i>, Qt.CaseSensitivity <i>cs</i> = Qt.CaseSensitive)</li><li><div class="fn" />QString <b><a href="qstring.html#fromAscii">fromAscii</a></b> (str <i>str</i>, int <i>size</i> = -1)</li><li><div class="fn" />QString <b><a href="qstring.html#fromLatin1">fromLatin1</a></b> (str <i>str</i>, int <i>size</i> = -1)</li><li><div class="fn" />QString <b><a href="qstring.html#fromLocal8Bit">fromLocal8Bit</a></b> (str <i>str</i>, int <i>size</i> = -1)</li><li><div class="fn" />QString <b><a href="qstring.html#fromUtf8">fromUtf8</a></b> (str <i>str</i>, int <i>size</i> = -1)</li><li><div class="fn" />int <b><a href="qstring.html#localeAwareCompare-3">localeAwareCompare</a></b> (QString <i>s1</i>, QString <i>s2</i>)</li><li><div class="fn" />int <b><a href="qstring.html#localeAwareCompare-4">localeAwareCompare</a></b> (QString <i>s1</i>, QStringRef <i>s2</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#number">number</a></b> (int <i>n</i>, int <i>base</i> = 10)</li><li><div class="fn" />QString <b><a href="qstring.html#number-2">number</a></b> (float <i>n</i>, str <i>format</i> = 'g', int <i>precision</i> = 6)</li><li><div class="fn" />QString <b><a href="qstring.html#number-3">number</a></b> (int <i>n</i>, int <i>base</i> = 10)</li><li><div class="fn" />QString <b><a href="qstring.html#number-4">number</a></b> (int <i>n</i>, int <i>base</i> = 10)</li></ul><h3>Special Methods</h3><ul><li><div class="fn" />QString <b><a href="qstring.html#__add__">__add__</a></b> (<i>self</i>, QString <i>s2</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__add__-2">__add__</a></b> (<i>self</i>, QByteArray <i>ba</i>)</li><li><div class="fn" />int <b><a href="qstring.html#__contains__">__contains__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__eq__">__eq__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__eq__-2">__eq__</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__eq__-3">__eq__</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__eq__-4">__eq__</a></b> (<i>self</i>, QStringRef <i>s2</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__ge__">__ge__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__ge__-2">__ge__</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__ge__-3">__ge__</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__getitem__">__getitem__</a></b> (<i>self</i>, int <i>i</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__getitem__-2">__getitem__</a></b> (<i>self</i>, slice <i>slice</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__gt__">__gt__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__gt__-2">__gt__</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__gt__-3">__gt__</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" />int <b><a href="qstring.html#__hash__">__hash__</a></b> (<i>self</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__iadd__">__iadd__</a></b> (<i>self</i>, QChar.SpecialCharacter <i>c</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__iadd__-2">__iadd__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__iadd__-3">__iadd__</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__iadd__-4">__iadd__</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__imul__">__imul__</a></b> (<i>self</i>, int <i>m</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__le__">__le__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__le__-2">__le__</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__le__-3">__le__</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" /> <b><a href="qstring.html#__len__">__len__</a></b> (<i>self</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__lt__">__lt__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__lt__-2">__lt__</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__lt__-3">__lt__</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" />QString <b><a href="qstring.html#__mul__">__mul__</a></b> (<i>self</i>, int <i>m</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__ne__">__ne__</a></b> (<i>self</i>, QString <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__ne__-2">__ne__</a></b> (<i>self</i>, QLatin1String <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__ne__-3">__ne__</a></b> (<i>self</i>, QByteArray <i>s</i>)</li><li><div class="fn" />bool <b><a href="qstring.html#__ne__-4">__ne__</a></b> (<i>self</i>, QStringRef <i>s2</i>)</li><li><div class="fn" />str <b><a href="qstring.html#__repr__">__repr__</a></b> (<i>self</i>)</li><li><div class="fn" />str <b><a href="qstring.html#__str__">__str__</a></b> (<i>self</i>)</li></ul><a name="details" /><hr /><h2>Detailed Description</h2><p>This class can be pickled.</p><p>A Python string or unicode object, a
<a href="qlatin1string.html">QLatin1String</a> or a
<a href="qchar.html">QChar</a>
may be used whenever a
<a href="qstring.html">QString</a>
is expected.</p>
<p>The QString class provides a Unicode character string.</p>
<p>QString stores a string of 16-bit <a href="qchar.html">QChar</a>s, where each <a href="qchar.html">QChar</a>
corresponds one Unicode 4.0 character. (Unicode characters with
code values above 65535 are stored using surrogate pairs, i.e., two
consecutive <a href="qchar.html">QChar</a>s.)</p>
<p><a href="unicode.html#unicode">Unicode</a> is an international
standard that supports most of the writing systems in use today. It
is a superset of US-ASCII (ANSI X3.4-1986) and Latin-1 (ISO
8859-1), and all the US-ASCII/Latin-1 characters are available at
the same code positions.</p>
<p>Behind the scenes, QString uses <a href="implicit-sharing.html">implicit sharing</a> (copy-on-write) to
reduce memory usage and to avoid the needless copying of data. This
also helps reduce the inherent overhead of storing 16-bit
characters instead of 8-bit characters.</p>
<p>In addition to QString, Qt also provides the <a href="qbytearray.html">QByteArray</a> class to store raw bytes and
traditional 8-bit '\0'-terminated strings. For most purposes,
QString is the class you want to use. It is used throughout the Qt
API, and the Unicode support ensures that your applications will be
easy to translate if you want to expand your application's market
at some point. The two main cases where <a href="qbytearray.html">QByteArray</a> is appropriate are when you need
to store raw binary data, and when memory conservation is critical
(e.g., with <a href="qt-embedded-linux.html">Qt for Embedded
Linux</a>).</p>
<a id="initializing-a-string" name="initializing-a-string" />
<h3>Initializing a String</h3>
<p>One way to initialize a QString is simply to pass a <tt>const
char *</tt> to its constructor. For example, the following code
creates a QString of size 5 containing the data "Hello":</p>
<pre class="cpp">
<span class="type">QString</span> str <span class="operator">=</span> <span class="string">"Hello"</span>;
</pre>
<p>QString converts the <tt>const char *</tt> data into Unicode
using the <a href="qstring.html#fromAscii">fromAscii</a>()
function. By default, <a href="qstring.html#fromAscii">fromAscii</a>() treats character above 128
as Latin-1 characters, but this can be changed by calling <a href="qtextcodec.html#setCodecForCStrings">QTextCodec.setCodecForCStrings</a>().</p>
<p>In all of the QString functions that take <tt>const char *</tt>
parameters, the <tt>const char *</tt> is interpreted as a classic
C-style '\0'-terminated string. It is legal for the <tt>const char
*</tt> parameter to be 0.</p>
<p>You can also provide string data as an array of <a href="qchar.html">QChar</a>s:</p>
<pre class="cpp">
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="qchar.html">QChar</a></span> data<span class="operator">[</span><span class="number">4</span><span class="operator">]</span> <span class="operator">=</span> { <span class="number">0x0055</span><span class="operator">,</span> <span class="number">0x006e</span><span class="operator">,</span> <span class="number">0x10e3</span><span class="operator">,</span> <span class="number">0x03a3</span> };
<span class="type">QString</span> str(data<span class="operator">,</span> <span class="number">4</span>);
</pre>
<p>QString makes a deep copy of the <a href="qchar.html">QChar</a>
data, so you can modify it later without experiencing side effects.
(If for performance reasons you don't want to take a deep copy of
the character data, use <a href="qstring.html#fromRawData">QString.fromRawData</a>() instead.)</p>
<p>Another approach is to set the size of the string using <a href="qstring.html#resize">resize</a>() and to initialize the data
character per character. QString uses 0-based indexes, just like
C++ arrays. To access the character at a particular index position,
you can use <a href="qstring.html#operator-5b-5d">operator[]</a>().
On non-const strings, <a href="qstring.html#operator-5b-5d">operator[]</a>() returns a reference
to a character that can be used on the left side of an assignment.
For example:</p>
<pre class="cpp">
<span class="type">QString</span> str;
str<span class="operator">.</span>resize(<span class="number">4</span>);
str<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'U'</span>);
str<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'n'</span>);
str<span class="operator">[</span><span class="number">2</span><span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="number">0x10e3</span>);
str<span class="operator">[</span><span class="number">3</span><span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="number">0x03a3</span>);
</pre>
<p>For read-only access, an alternative syntax is to use the
<a href="qstring.html#at">at</a>() function:</p>
<pre class="cpp">
<span class="type">QString</span> str;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> str<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (str<span class="operator">.</span>at(i) <span class="operator">></span><span class="operator">=</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'a'</span>) <span class="operator">&</span><span class="operator">&</span> str<span class="operator">.</span>at(i) <span class="operator"><</span><span class="operator">=</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'f'</span>))
<a href="qtcore.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Found character in range [a-f]"</span>;
}
</pre>
<p>The <a href="qstring.html#at">at</a>() function can be faster
than <a href="qstring.html#operator-5b-5d">operator[]</a>(),
because it never causes a <a href="implicit-sharing.html#deep-copy">deep copy</a> to occur.
Alternatively, use the <a href="qstring.html#left">left</a>(),
<a href="qstring.html#right">right</a>(), or <a href="qstring.html#mid">mid</a>() functions to extract several
characters at a time.</p>
<p>A QString can embed '\0' characters (<a href="qchar.html#SpecialCharacter-enum">QChar.Null</a>). The <a href="qstring.html#size">size</a>() function always returns the size of
the whole string, including embedded '\0' characters.</p>
<p>After a call to the <a href="qstring.html#resize">resize</a>()
function, newly allocated characters have undefined values. To set
all the characters in the string to a particular value, use the
<a href="qstring.html#fill">fill</a>() function.</p>
<p>QString provides dozens of overloads designed to simplify string
usage. For example, if you want to compare a QString with a string
literal, you can write code like this and it will work as
expected:</p>
<pre class="cpp">
<span class="type">QString</span> str;
<span class="keyword">if</span> (str <span class="operator">=</span><span class="operator">=</span> <span class="string">"auto"</span> <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="string">"extern"</span>
<span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="string">"static"</span> <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="string">"register"</span>) {
<span class="comment">// ...</span>
}
</pre>
<p>You can also pass string literals to functions that take
QStrings as arguments, invoking the QString(const char *)
constructor. Similarly, you can pass a QString to a function that
takes a <tt>const char *</tt> argument using the <a href="qtcore.html#qPrintable">qPrintable</a>() macro which returns the
given QString as a <tt>const char *</tt>. This is equivalent to
calling <QString>.<a href="qstring.html#toLocal8Bit">toLocal8Bit</a>().<a href="qstring.html#constData">constData</a>().</p>
<a id="manipulating-string-data" name="manipulating-string-data" />
<h3>Manipulating String Data</h3>
<p>QString provides the following basic functions for modifying the
character data: <a href="qstring.html#append">append</a>(),
<a href="qstring.html#prepend">prepend</a>(), <a href="qstring.html#insert">insert</a>(), <a href="qstring.html#replace">replace</a>(), and <a href="qstring.html#remove">remove</a>(). For example:</p>
<pre class="cpp">
<span class="type">QString</span> str <span class="operator">=</span> <span class="string">"and"</span>;
str<span class="operator">.</span>prepend(<span class="string">"rock "</span>); <span class="comment">// str == "rock and"</span>
str<span class="operator">.</span>append(<span class="string">" roll"</span>); <span class="comment">// str == "rock and roll"</span>
str<span class="operator">.</span>replace(<span class="number">5</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="string">"&"</span>); <span class="comment">// str == "rock & roll"</span>
</pre>
<p>If you are building a QString gradually and know in advance
approximately how many characters the QString will contain, you can
call <a href="qstring.html#reserve">reserve</a>(), asking QString
to preallocate a certain amount of memory. You can also call
<a href="qstring.html#capacity">capacity</a>() to find out how much
memory QString actually allocated.</p>
<p>The <a href="qstring.html#replace">replace</a>() and <a href="qstring.html#remove">remove</a>() functions' first two arguments
are the position from which to start erasing and the number of
characters that should be erased. If you want to replace all
occurrences of a particular substring with another, use one of the
two-parameter <a href="qstring.html#replace">replace</a>()
overloads.</p>
<p>A frequent requirement is to remove whitespace characters from a
string ('\n', '\t', ' ', etc.). If you want to remove whitespace
from both ends of a QString, use the <a href="qstring.html#trimmed">trimmed</a>() function. If you want to
remove whitespace from both ends and replace multiple consecutive
whitespaces with a single space character within the string, use
<a href="qstring.html#simplified">simplified</a>().</p>
<p>If you want to find all occurrences of a particular character or
substring in a QString, use the <a href="qstring.html#indexOf">indexOf</a>() or <a href="qstring.html#lastIndexOf">lastIndexOf</a>() functions. The former
searches forward starting from a given index position, the latter
searches backward. Both return the index position of the character
or substring if they find it; otherwise, they return -1. For
example, here's a typical loop that finds all occurrences of a
particular substring:</p>
<pre class="cpp">
<span class="type">QString</span> str <span class="operator">=</span> <span class="string">"We must be <b>bold</b>, very <b>bold</b>"</span>;
<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> ((j <span class="operator">=</span> str<span class="operator">.</span>indexOf(<span class="string">"<b>"</span><span class="operator">,</span> j)) <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
<a href="qtcore.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Found <b> tag at index position"</span> <span class="operator"><</span><span class="operator"><</span> j;
<span class="operator">+</span><span class="operator">+</span>j;
}
</pre>
<p>QString provides many functions for converting numbers into
strings and strings into numbers. See the <a href="qstring.html#arg">arg</a>() functions, the <a href="qstring.html#setNum">setNum</a>() functions, the <a href="qstring.html#number">number</a>() static functions, and the
<a href="qstring.html#toInt">toInt</a>(), <a href="qstring.html#toDouble">toDouble</a>(), and similar functions.</p>
<p>To get an upper- or lowercase version of a string use <a href="qstring.html#toUpper">toUpper</a>() or <a href="qstring.html#toLower">toLower</a>().</p>
<p>Lists of strings are handled by the <a href="qstringlist.html">QStringList</a> class. You can split a string
into a list of strings using the <a href="qstring.html#split">split</a>() function, and join a list of
strings into a single string with an optional separator using
<a href="qstringlist.html#join">QStringList.join</a>(). You can
obtain a list of strings from a string list that contain a
particular substring or that match a particular <a href="qregexp.html">QRegExp</a> using the <a href="qstringlist.html#filter">QStringList.filter</a>() function.</p>
<a id="querying-string-data" name="querying-string-data" />
<h3>Querying String Data</h3>
<p>If you want to see if a QString starts or ends with a particular
substring use <a href="qstring.html#startsWith">startsWith</a>() or
<a href="qstring.html#endsWith">endsWith</a>(). If you simply want
to check whether a QString contains a particular character or
substring, use the <a href="qstring.html#contains">contains</a>()
function. If you want to find out how many times a particular
character or substring occurs in the string, use <a href="qstring.html#count">count</a>().</p>
<p>QStrings can be compared using overloaded operators such as
<a href="qstring.html#operator-lt">operator<</a>(), <a href="qstring.html#operator-lt-eq">operator<=</a>(), <a href="qstring.html#operator-eq-eq">operator==</a>(), <a href="qstring.html#operator-gt-eq">operator>=</a>(), and so on. Note
that the comparison is based exclusively on the numeric Unicode
values of the characters. It is very fast, but is not what a human
would expect; the <a href="qstring.html#localeAwareCompare">QString.localeAwareCompare</a>()
function is a better choice for sorting user-interface strings.</p>
<p>To obtain a pointer to the actual character data, call <a href="qstring.html#data">data</a>() or <a href="qstring.html#constData">constData</a>(). These functions return a
pointer to the beginning of the <a href="qchar.html">QChar</a>
data. The pointer is guaranteed to remain valid until a non-const
function is called on the QString.</p>
<a id="converting-between-8-bit-strings-and-unicode-strings" name="converting-between-8-bit-strings-and-unicode-strings" />
<h3>Converting Between 8-Bit Strings and Unicode Strings</h3>
<p>QString provides the following four functions that return a
<tt>const char *</tt> version of the string as <a href="qbytearray.html">QByteArray</a>: <a href="qstring.html#toAscii">toAscii</a>(), <a href="qstring.html#toLatin1">toLatin1</a>(), <a href="qstring.html#toUtf8">toUtf8</a>(), and <a href="qstring.html#toLocal8Bit">toLocal8Bit</a>().</p>
<ul>
<li><a href="qstring.html#toAscii">toAscii</a>() returns an 8-bit
string encoded using the codec specified by
QTextCodec.codecForCStrings (by default, that is Latin 1).</li>
<li><a href="qstring.html#toLatin1">toLatin1</a>() returns a
Latin-1 (ISO 8859-1) encoded 8-bit string.</li>
<li><a href="qstring.html#toUtf8">toUtf8</a>() returns a UTF-8
encoded 8-bit string. UTF-8 is a superset of US-ASCII (ANSI
X3.4-1986) that supports the entire Unicode character set through
multibyte sequences.</li>
<li><a href="qstring.html#toLocal8Bit">toLocal8Bit</a>() returns an
8-bit string using the system's local encoding.</li>
</ul>
<p>To convert from one of these encodings, QString provides
<a href="qstring.html#fromAscii">fromAscii</a>(), <a href="qstring.html#fromLatin1">fromLatin1</a>(), <a href="qstring.html#fromUtf8">fromUtf8</a>(), and <a href="qstring.html#fromLocal8Bit">fromLocal8Bit</a>(). Other encodings
are supported through the <a href="qtextcodec.html">QTextCodec</a>
class.</p>
<p>As mentioned above, QString provides a lot of functions and
operators that make it easy to interoperate with <tt>const char
*</tt> strings. But this functionality is a double-edged sword: It
makes QString more convenient to use if all strings are US-ASCII or
Latin-1, but there is always the risk that an implicit conversion
from or to <tt>const char *</tt> is done using the wrong 8-bit
encoding. To minimize these risks, you can turn off these implicit
conversions by defining the following two preprocessor symbols:</p>
<ul>
<li><tt>QT_NO_CAST_FROM_ASCII</tt> disables automatic conversions
from C string literals and pointers to Unicode.</li>
<li><tt>QT_NO_CAST_TO_ASCII</tt> disables automatic conversion from
QString to C strings.</li>
</ul>
<p>One way to define these preprocessor symbols globally for your
application is to add the following entry to your <a href="qmake-project-files.html">qmake project file</a>:</p>
<pre class="cpp">
DEFINES <span class="operator">+</span><span class="operator">=</span> QT_NO_CAST_FROM_ASCII \
QT_NO_CAST_TO_ASCII
</pre>
<p>You then need to explicitly call <a href="qstring.html#fromAscii">fromAscii</a>(), <a href="qstring.html#fromLatin1">fromLatin1</a>(), <a href="qstring.html#fromUtf8">fromUtf8</a>(), or <a href="qstring.html#fromLocal8Bit">fromLocal8Bit</a>() to construct a
QString from an 8-bit string, or use the lightweight <a href="qlatin1string.html">QLatin1String</a> class, for example:</p>
<pre class="cpp">
<span class="type">QString</span> url <span class="operator">=</span> QLatin1String(<span class="string">"http://www.unicode.org/"</span>);
</pre>
<p>Similarly, you must call <a href="qstring.html#toAscii">toAscii</a>(), <a href="qstring.html#toLatin1">toLatin1</a>(), <a href="qstring.html#toUtf8">toUtf8</a>(), or <a href="qstring.html#toLocal8Bit">toLocal8Bit</a>() explicitly to convert
the QString to an 8-bit string. (Other encodings are supported
through the <a href="qtextcodec.html">QTextCodec</a> class.)</p>
<table class="generic" width="100 %">
<thead>
<tr class="qt-style">
<th>Note for C Programmers</th>
</tr>
</thead>
<tr class="odd" valign="top">
<td>Due to C++'s type system and the fact that QString is <a href="implicit-sharing.html#implicitly-shared">implicitly shared</a>,
QStrings may be treated like <tt>int</tt>s or other basic types.
For example:
<pre class="cpp">
<span class="type">QString</span> Widget<span class="operator">.</span>boolToString(<span class="type">bool</span> b)
{
<span class="type">QString</span> result;
<span class="keyword">if</span> (b)
result <span class="operator">=</span> <span class="string">"True"</span>;
<span class="keyword">else</span>
result <span class="operator">=</span> <span class="string">"False"</span>;
<span class="keyword">return</span> result;
}
</pre>
<p>The <tt>result</tt> variable, is a normal variable allocated on
the stack. When <tt>return</tt> is called, and because we're
returning by value, the copy constructor is called and a copy of
the string is returned. No actual copying takes place thanks to the
implicit sharing.</p>
</td>
</tr>
</table>
<a id="distinction-between-null-and-empty-strings" name="distinction-between-null-and-empty-strings" />
<h3>Distinction Between Null and Empty Strings</h3>
<p>For historical reasons, QString distinguishes between a null
string and an empty string. A <i>null</i> string is a string that
is initialized using QString's default constructor or by passing
(const char *)0 to the constructor. An <i>empty</i> string is any
string with size 0. A null string is always empty, but an empty
string isn't necessarily null:</p>
<pre class="cpp">
<span class="type">QString</span>()<span class="operator">.</span>isNull(); <span class="comment">// returns true</span>
<span class="type">QString</span>()<span class="operator">.</span>isEmpty(); <span class="comment">// returns true</span>
<span class="type">QString</span>(<span class="string">""</span>)<span class="operator">.</span>isNull(); <span class="comment">// returns false</span>
<span class="type">QString</span>(<span class="string">""</span>)<span class="operator">.</span>isEmpty(); <span class="comment">// returns true</span>
<span class="type">QString</span>(<span class="string">"abc"</span>)<span class="operator">.</span>isNull(); <span class="comment">// returns false</span>
<span class="type">QString</span>(<span class="string">"abc"</span>)<span class="operator">.</span>isEmpty(); <span class="comment">// returns false</span>
</pre>
<p>All functions except <a href="qstring.html#isNull">isNull</a>()
treat null strings the same as empty strings. For example, <a href="qstring.html#toAscii">toAscii</a>().<a href="qstring.html#constData">constData</a>() returns a pointer to a
'\0' character for a null string (<i>not</i> a null pointer), and
<a href="qstring.html#QString">QString</a>() compares equal to
QString(""). We recommend that you always use the <a href="qstring.html#isEmpty">isEmpty</a>() function and avoid <a href="qstring.html#isNull">isNull</a>().</p>
<a id="argument-formats" name="argument-formats" />
<h3>Argument Formats</h3>
<p>In member functions where an argument <i>format</i> can be
specified (e.g., <a href="qstring.html#arg">arg</a>(), <a href="qstring.html#number">number</a>()), the argument <i>format</i> can
be one of the following:</p>
<table class="generic">
<thead>
<tr class="qt-style">
<th>Format</th>
<th>Meaning</th>
</tr>
</thead>
<tr class="odd" valign="top">
<td><tt>e</tt></td>
<td>format as [-]9.9e[+|-]999</td>
</tr>
<tr class="even" valign="top">
<td><tt>E</tt></td>
<td>format as [-]9.9E[+|-]999</td>
</tr>
<tr class="odd" valign="top">
<td><tt>f</tt></td>
<td>format as [-]9.9</td>
</tr>
<tr class="even" valign="top">
<td><tt>g</tt></td>
<td>use <tt>e</tt> or <tt>f</tt> format, whichever is the most
concise</td>
</tr>
<tr class="odd" valign="top">
<td><tt>G</tt></td>
<td>use <tt>E</tt> or <tt>f</tt> format, whichever is the most
concise</td>
</tr>
</table>
<p>A <i>precision</i> is also specified with the argument
<i>format</i>. For the 'e', 'E', and 'f' formats, the
<i>precision</i> represents the number of digits <i>after</i> the
decimal point. For the 'g' and 'G' formats, the <i>precision</i>
represents the maximum number of significant digits (trailing
zeroes are omitted).</p>
<a id="more-efficient-string-construction" name="more-efficient-string-construction" />
<h3>More Efficient String Construction</h3>
<p>Using the QString <tt>'+'</tt> operator, it is easy to construct
a complex string from multiple substrings. You will often write
code like this:</p>
<pre class="cpp">
<span class="type">QString</span> foo;
<span class="type">QString</span> type <span class="operator">=</span> <span class="string">"long"</span>;
foo<span class="operator">-</span><span class="operator">></span>setText(QLatin1String(<span class="string">"vector<"</span>) <span class="operator">+</span> type <span class="operator">+</span> QLatin1String(<span class="string">">.iterator"</span>));
<span class="keyword">if</span> (foo<span class="operator">.</span>startsWith(<span class="string">"("</span> <span class="operator">+</span> type <span class="operator">+</span> <span class="string">") 0x"</span>))
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
</pre>
<p>There is nothing wrong with either of these string
constructions, but there are a few hidden inefficiencies. Beginning
with Qt 4.6, you can eliminate them.</p>
<p>First, multiple uses of the <tt>'+'</tt> operator usually means
multiple memory allocations. When concatenating <i>n</i>
substrings, where <i>n > 2</i>, there can be as many as <i>n -
1</i> calls to the memory allocator.</p>
<p>Second, <a href="qlatin1string.html">QLatin1String</a> does not
store its length internally but calls <a href="qtcore.html#qstrlen">qstrlen</a>() when it needs to know its
length.</p>
<p>In 4.6, an internal template class <tt>QStringBuilder</tt> has
been added along with a few helper functions. This class is marked
internal and does not appear in the documentation, because you
aren't meant to instantiate it in your code. Its use will be
automatic, as described below. The class is found in
<tt>src/corelib/tools/qstringbuilder.cpp</tt> if you want to have a
look at it.</p>
<p><tt>QStringBuilder</tt> uses expression templates and
reimplements the <tt>'%'</tt> operator so that when you use
<tt>'%'</tt> for string concatenation instead of <tt>'+'</tt>,
multiple substring concatenations will be postponed until the final
result is about to be assigned to a QString. At this point, the
amount of memory required for the final result is known. The memory
allocator is then called <i>once</i> to get the required space, and
the substrings are copied into it one by one.</p>
<p><tt>QLatin1Literal</tt> is a second internal class that can
replace <a href="qlatin1string.html">QLatin1String</a>, which can't
be changed for compatibility reasons. <tt>QLatin1Literal</tt>
stores its length, thereby saving time when <tt>QStringBuilder</tt>
computes the amount of memory required for the final string.</p>
<p>Additional efficiency is gained by inlining and reduced
reference counting (the QString created from a
<tt>QStringBuilder</tt> typically has a ref count of 1, whereas
<a href="qstring.html#append">QString.append</a>() needs an extra
test).</p>
<p>There are three ways you can access this improved method of
string construction. The straightforward way is to include
<tt>QStringBuilder</tt> wherever you want to use it, and use the
<tt>'%'</tt> operator instead of <tt>'+'</tt> when concatenating
strings:</p>
<pre class="cpp">
<span class="preprocessor">#include <QStringBuilder></span>
<span class="type">QString</span> hello(<span class="string">"hello"</span>);
<span class="type"><a href="qstringref.html">QStringRef</a></span> el(<span class="operator">&</span>hello<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">3</span>);
QLatin1String world(<span class="string">"world"</span>);
<span class="type">QString</span> message <span class="operator">=</span> hello <span class="operator">%</span> el <span class="operator">%</span> world <span class="operator">%</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'!'</span>);
</pre>
<p>A more global approach which is the most convenient but not
entirely source compatible, is to this define in your .pro
file:</p>
<pre class="cpp">
DEFINES <span class="operator">*</span><span class="operator">=</span> QT_USE_QSTRINGBUILDER
</pre>
<p>and the <tt>'+'</tt> will automatically be performed as the
<tt>QStringBuilder</tt> <tt>'%'</tt> everywhere.</p>
<hr /><h2>Type Documentation</h2><h3 class="fn"><a name="NormalizationForm-enum" />QString.NormalizationForm</h3><p>This enum describes the various normalized forms of Unicode
text.</p>
<table class="valuelist">
<tr class="odd" valign="top">
<th class="tblConst">Constant</th>
<th class="tblval">Value</th>
<th class="tbldscr">Description</th>
</tr>
<tr>
<td class="topAlign"><tt>QString.NormalizationForm_D</tt></td>
<td class="topAlign"><tt>0</tt></td>
<td class="topAlign">Canonical Decomposition</td>
</tr>
<tr>
<td class="topAlign"><tt>QString.NormalizationForm_C</tt></td>
<td class="topAlign"><tt>1</tt></td>
<td class="topAlign">Canonical Decomposition followed by Canonical
Composition</td>
</tr>
<tr>
<td class="topAlign"><tt>QString.NormalizationForm_KD</tt></td>
<td class="topAlign"><tt>2</tt></td>
<td class="topAlign">Compatibility Decomposition</td>
</tr>
<tr>
<td class="topAlign"><tt>QString.NormalizationForm_KC</tt></td>
<td class="topAlign"><tt>3</tt></td>
<td class="topAlign">Compatibility Decomposition followed by
Canonical Composition</td>
</tr>
</table>
<p><b>See also</b> <a href="qstring.html#normalized">normalized</a>() and <a href="http://www.unicode.org/reports/tr15/">Unicode Standard Annex
#15</a>.</p>
<h3 class="fn"><a name="SectionFlag-enum" />QString.SectionFlag</h3><p>This enum specifies flags that can be used to affect various
aspects of the <a href="qstring.html#section">section</a>()
function's behavior with respect to separators and empty
fields.</p>
<table class="valuelist">
<tr class="odd" valign="top">
<th class="tblConst">Constant</th>
<th class="tblval">Value</th>
<th class="tbldscr">Description</th>
</tr>
<tr>
<td class="topAlign"><tt>QString.SectionDefault</tt></td>
<td class="topAlign"><tt>0x00</tt></td>
<td class="topAlign">Empty fields are counted, leading and trailing
separators are not included, and the separator is compared case
sensitively.</td>
</tr>
<tr>
<td class="topAlign"><tt>QString.SectionSkipEmpty</tt></td>
<td class="topAlign"><tt>0x01</tt></td>
<td class="topAlign">Treat empty fields as if they don't exist,
i.e. they are not considered as far as <i>start</i> and <i>end</i>
are concerned.</td>
</tr>
<tr>
<td class="topAlign">
<tt>QString.SectionIncludeLeadingSep</tt></td>
<td class="topAlign"><tt>0x02</tt></td>
<td class="topAlign">Include the leading separator (if any) in the
result string.</td>
</tr>
<tr>
<td class="topAlign">
<tt>QString.SectionIncludeTrailingSep</tt></td>
<td class="topAlign"><tt>0x04</tt></td>
<td class="topAlign">Include the trailing separator (if any) in the
result string.</td>
</tr>
<tr>
<td class="topAlign">
<tt>QString.SectionCaseInsensitiveSeps</tt></td>
<td class="topAlign"><tt>0x08</tt></td>
<td class="topAlign">Compare the separator case-insensitively.</td>
</tr>
</table>
<p>The SectionFlags type is a typedef for <a href="qflags.html">QFlags</a><SectionFlag>. It stores an OR
combination of SectionFlag values.</p>
<p><b>See also</b> <a href="qstring.html#section">section</a>().</p>
<h3 class="fn"><a name="SplitBehavior-enum" />QString.SplitBehavior</h3><p>This enum specifies how the <a href="qstring.html#split">split</a>() function should behave with
respect to empty strings.</p>
<table class="valuelist">
<tr class="odd" valign="top">
<th class="tblConst">Constant</th>
<th class="tblval">Value</th>
<th class="tbldscr">Description</th>
</tr>
<tr>
<td class="topAlign"><tt>QString.KeepEmptyParts</tt></td>
<td class="topAlign"><tt>0</tt></td>
<td class="topAlign">If a field is empty, keep it in the
result.</td>
</tr>
<tr>
<td class="topAlign"><tt>QString.SkipEmptyParts</tt></td>
<td class="topAlign"><tt>1</tt></td>
<td class="topAlign">If a field is empty, don't include it in the
result.</td>
</tr>
</table>
<p><b>See also</b> <a href="qstring.html#split">split</a>().</p>
<hr /><h2>Method Documentation</h2><h3 class="fn"><a name="QString" />QString.__init__ (<i>self</i>)</h3><p>Constructs a null string. Null strings are also empty.</p>
<p><b>See also</b> <a href="qstring.html#isEmpty">isEmpty</a>().</p>
<h3 class="fn"><a name="QString" />QString.__init__ (<i>self</i>, <a href="qkeysequence.html">QKeySequence</a>)</h3><p>This method is only available if the QtGui module is imported.</p><p>Constructs a null string. Null strings are also empty.</p>
<p><b>See also</b> <a href="qstring.html#isEmpty">isEmpty</a>().</p>
<h3 class="fn"><a name="QString" />QString.__init__ (<i>self</i>, <a href="qscriptstring.html">QScriptString</a>)</h3><p>This method is only available if the QtScript module is imported.</p><p>Constructs a null string. Null strings are also empty.</p>
<p><b>See also</b> <a href="qstring.html#isEmpty">isEmpty</a>().</p>
<h3 class="fn"><a name="QString-2" />QString.__init__ (<i>self</i>, int <i>size</i>, QChar <i>c</i>)</h3><p>Constructs a string initialized with the first <i>size</i>
characters of the <a href="qchar.html">QChar</a> array
<i>unicode</i>.</p>
<p><a href="qstring.html">QString</a> makes a deep copy of the
string data. The unicode data is copied as is and the Byte Order
Mark is preserved if present.</p>
<h3 class="fn"><a name="QString-3" />QString.__init__ (<i>self</i>, QString <i>s</i>)</h3><p>Constructs a string initialized with the characters of the
<a href="qchar.html">QChar</a> array <i>unicode</i>, which must be
terminated with a 0.</p>
<p><a href="qstring.html">QString</a> makes a deep copy of the
string data. The unicode data is copied as is and the Byte Order
Mark is preserved if present.</p>
<p>This function was introduced in Qt 4.7.</p>
<h3 class="fn"><a name="QString-4" />QString.__init__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>a</i>)</h3><p>Constructs a string of size 1 containing the character
<i>ch</i>.</p>
<h3 class="fn"><a name="QString-5" />QString.__init__ (<i>self</i>, <a href="quuid.html">QUuid</a>)</h3><p>Constructs a string of the given <i>size</i> with every
character set to <i>ch</i>.</p>
<p><b>See also</b> <a href="qstring.html#fill">fill</a>().</p>
<h3 class="fn"><a name="append" />QString QString.append (<i>self</i>, QString <i>s</i>)</h3><p>Appends the string <i>str</i> onto the end of this string.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"free"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> <span class="string">"dom"</span>;
x<span class="operator">.</span>append(y);
<span class="comment">// x == "freedom"</span>
</pre>
<p>This is the same as using the <a href="qstring.html#insert">insert</a>() function:</p>
<pre class="cpp">
x<span class="operator">.</span>insert(x<span class="operator">.</span>size()<span class="operator">,</span> y);
</pre>
<p>The append() function is typically very fast (<a href="containers.html#constant-time">constant time</a>), because
<a href="qstring.html">QString</a> preallocates extra space at the
end of the string data so it can grow without reallocating the
entire string each time.</p>
<p><b>See also</b> <a href="qstring.html#operator-2b-eq">operator+=</a>(), <a href="qstring.html#prepend">prepend</a>(), and <a href="qstring.html#insert">insert</a>().</p>
<h3 class="fn"><a name="append-2" />QString QString.append (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><p>Appends the given string <i>reference</i> to this string and
returns the result.</p>
<p>This function was introduced in Qt 4.4.</p>
<h3 class="fn"><a name="append-3" />QString QString.append (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><p>This function overloads <a href="qstring.html#append">append</a>().</p>
<p>Appends the Latin-1 string <i>str</i> to this string.</p>
<h3 class="fn"><a name="arg" />QString QString.arg (<i>self</i>, int <i>a</i>, int <i>fieldWidth</i> = 0, int <i>base</i> = 10, QChar <i>fillChar</i> = QLatin1Char(' '))</h3><p>Returns a copy of this string with the lowest numbered place
marker replaced by string <i>a</i>, i.e., <tt>%1</tt>, <tt>%2</tt>,
..., <tt>%99</tt>.</p>
<p><i>fieldWidth</i> specifies the minimum amount of space that
argument <i>a</i> shall occupy. If <i>a</i> requires less space
than <i>fieldWidth</i>, it is padded to <i>fieldWidth</i> with
character <i>fillChar</i>. A positive <i>fieldWidth</i> produces
right-aligned text. A negative <i>fieldWidth</i> produces
left-aligned text.</p>
<p>This example shows how we might create a <tt>status</tt> string
for reporting progress while processing a list of files:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> i; <span class="comment">// current file's number</span>
<span class="type"><a href="qstring.html">QString</a></span> total; <span class="comment">// number of files to process</span>
<span class="type"><a href="qstring.html">QString</a></span> fileName; <span class="comment">// current file's name</span>
<span class="type"><a href="qstring.html">QString</a></span> status <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Processing file %1 of %2: %3"</span>)
<span class="operator">.</span>arg(i)<span class="operator">.</span>arg(total)<span class="operator">.</span>arg(fileName);
</pre>
<p>First, <tt>arg(i)</tt> replaces <tt>%1</tt>. Then
<tt>arg(total)</tt> replaces <tt>%2</tt>. Finally,
<tt>arg(fileName)</tt> replaces <tt>%3</tt>.</p>
<p>One advantage of using arg() over <a href="qstring.html#sprintf">sprintf</a>() is that the order of the
numbered place markers can change, if the application's strings are
translated into other languages, but each arg() will still replace
the lowest numbered unreplaced place marker, no matter where it
appears. Also, if place marker <tt>%i</tt> appears more than once
in the string, the arg() replaces all of them.</p>
<p>If there is no unreplaced place marker remaining, a warning
message is output and the result is undefined. Place marker numbers
must be in the range 1 to 99.</p>
<h3 class="fn"><a name="arg-2" />QString QString.arg (<i>self</i>, float <i>a</i>, int <i>fieldWidth</i> = 0, str <i>format</i> = 'g', int <i>precision</i> = -1, QChar <i>fillChar</i> = QLatin1Char(' '))</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as <tt>str.arg(a1).arg(a2)</tt>, except that
the strings <i>a1</i> and <i>a2</i> are replaced in one pass. This
can make a difference if <i>a1</i> contains e.g. <tt>%1</tt>:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str;
str <span class="operator">=</span> <span class="string">"%1 %2"</span>;
str<span class="operator">.</span>arg(<span class="string">"%1f"</span><span class="operator">,</span> <span class="string">"Hello"</span>); <span class="comment">// returns "%1f Hello"</span>
str<span class="operator">.</span>arg(<span class="string">"%1f"</span>)<span class="operator">.</span>arg(<span class="string">"Hello"</span>); <span class="comment">// returns "Hellof %2"</span>
</pre>
<h3 class="fn"><a name="arg-3" />QString QString.arg (<i>self</i>, int <i>a</i>, int <i>fieldWidth</i> = 0, int <i>base</i> = 10, QChar <i>fillChar</i> = QLatin1Char(' '))</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as calling
<tt>str.arg(a1).arg(a2).arg(a3)</tt>, except that the strings
<i>a1</i>, <i>a2</i> and <i>a3</i> are replaced in one pass.</p>
<h3 class="fn"><a name="arg-4" />QString QString.arg (<i>self</i>, int <i>a</i>, int <i>fieldWidth</i> = 0, int <i>base</i> = 10, QChar <i>fillChar</i> = QLatin1Char(' '))</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as calling
<tt>str.arg(a1).arg(a2).arg(a3).arg(a4)</tt>, except that the
strings <i>a1</i>, <i>a2</i>, <i>a3</i> and <i>a4</i> are replaced
in one pass.</p>
<h3 class="fn"><a name="arg-5" />QString QString.arg (<i>self</i>, QString <i>a</i>, int <i>fieldWidth</i> = 0, QChar <i>fillChar</i> = QLatin1Char(' '))</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as calling
<tt>str.arg(a1).arg(a2).arg(a3).arg(a4).arg(a5)</tt>, except that
the strings <i>a1</i>, <i>a2</i>, <i>a3</i>, <i>a4</i>, and
<i>a5</i> are replaced in one pass.</p>
<h3 class="fn"><a name="arg-6" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as calling
<tt>str.arg(a1).arg(a2).arg(a3).arg(a4).arg(a5).arg(a6))</tt>,
except that the strings <i>a1</i>, <i>a2</i>, <i>a3</i>, <i>a4</i>,
<i>a5</i>, and <i>a6</i> are replaced in one pass.</p>
<h3 class="fn"><a name="arg-7" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as calling
<tt>str.arg(a1).arg(a2).arg(a3).arg(a4).arg(a5).arg(a6).arg(a7)</tt>,
except that the strings <i>a1</i>, <i>a2</i>, <i>a3</i>, <i>a4</i>,
<i>a5</i>, <i>a6</i>, and <i>a7</i> are replaced in one pass.</p>
<h3 class="fn"><a name="arg-8" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as calling
<tt>str.arg(a1).arg(a2).arg(a3).arg(a4).arg(a5).arg(a6).arg(a7).arg(a8)</tt>,
except that the strings <i>a1</i>, <i>a2</i>, <i>a3</i>, <i>a4</i>,
<i>a5</i>, <i>a6</i>, <i>a7</i>, and <i>a8</i> are replaced in one
pass.</p>
<h3 class="fn"><a name="arg-9" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>This is the same as calling
<tt>str.arg(a1).arg(a2).arg(a3).arg(a4).arg(a5).arg(a6).arg(a7).arg(a8).arg(a9)</tt>,
except that the strings <i>a1</i>, <i>a2</i>, <i>a3</i>, <i>a4</i>,
<i>a5</i>, <i>a6</i>, <i>a7</i>, <i>a8</i>, and <i>a9</i> are
replaced in one pass.</p>
<h3 class="fn"><a name="arg-10" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>The <i>a</i> argument is expressed in base <i>base</i>, which is
10 by default and must be between 2 and 36. For bases other than
10, <i>a</i> is treated as an unsigned integer.</p>
<p><i>fieldWidth</i> specifies the minimum amount of space that
<i>a</i> is padded to and filled with the character
<i>fillChar</i>. A positive value produces right-aligned text; a
negative value produces left-aligned text.</p>
<p>The '%' can be followed by an 'L', in which case the sequence is
replaced with a localized representation of <i>a</i>. The
conversion uses the default locale, set by <a href="qlocale.html#setDefault">QLocale.setDefault</a>(). If no default
locale was specified, the "C" locale is used. The 'L' flag is
ignored if <i>base</i> is not 10.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str;
str <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Decimal 63 is %1 in hexadecimal"</span>)
<span class="operator">.</span>arg(<span class="number">63</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">16</span>);
<span class="comment">// str == "Decimal 63 is 3f in hexadecimal"</span>
<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>setDefault(<span class="type"><a href="qlocale.html">QLocale</a></span>(<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>English<span class="operator">,</span> <span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>UnitedStates));
str <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"%1 %L2 %L3"</span>)
<span class="operator">.</span>arg(<span class="number">12345</span>)
<span class="operator">.</span>arg(<span class="number">12345</span>)
<span class="operator">.</span>arg(<span class="number">12345</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">16</span>);
<span class="comment">// str == "12345 12,345 3039"</span>
</pre>
<p>If <i>fillChar</i> is '0' (the number 0, ASCII 48), the locale's
zero is used. For negative numbers, zero padding might appear
before the minus sign.</p>
<h3 class="fn"><a name="arg-11" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>, QString <i>a7</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p>The <i>base</i> argument specifies the base to use when
converting the integer <i>a</i> into a string. The base must be
between 2 and 36.</p>
<p>If <i>fillChar</i> is '0' (the number 0, ASCII 48), the locale's
zero is used. For negative numbers, zero padding might appear
before the minus sign.</p>
<h3 class="fn"><a name="arg-12" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>, QString <i>a7</i>, QString <i>a8</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p><i>fieldWidth</i> specifies the minimum amount of space that
<i>a</i> is padded to and filled with the character
<i>fillChar</i>. A positive value produces right-aligned text; a
negative value produces left-aligned text.</p>
<p>The <i>a</i> argument is expressed in the given <i>base</i>,
which is 10 by default and must be between 2 and 36.</p>
<p>The '%' can be followed by an 'L', in which case the sequence is
replaced with a localized representation of <i>a</i>. The
conversion uses the default locale. The default locale is
determined from the system's locale settings at application
startup. It can be changed using <a href="qlocale.html#setDefault">QLocale.setDefault</a>(). The 'L' flag
is ignored if <i>base</i> is not 10.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str;
str <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Decimal 63 is %1 in hexadecimal"</span>)
<span class="operator">.</span>arg(<span class="number">63</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">16</span>);
<span class="comment">// str == "Decimal 63 is 3f in hexadecimal"</span>
<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>setDefault(<span class="type"><a href="qlocale.html">QLocale</a></span>(<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>English<span class="operator">,</span> <span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>UnitedStates));
str <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"%1 %L2 %L3"</span>)
<span class="operator">.</span>arg(<span class="number">12345</span>)
<span class="operator">.</span>arg(<span class="number">12345</span>)
<span class="operator">.</span>arg(<span class="number">12345</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">16</span>);
<span class="comment">// str == "12345 12,345 3039"</span>
</pre>
<p>If <i>fillChar</i> is '0' (the number 0, ASCII 48), the locale's
zero is used. For negative numbers, zero padding might appear
before the minus sign.</p>
<h3 class="fn"><a name="arg-13" />QString QString.arg (<i>self</i>, QString <i>a1</i>, QString <i>a2</i>, QString <i>a3</i>, QString <i>a4</i>, QString <i>a5</i>, QString <i>a6</i>, QString <i>a7</i>, QString <i>a8</i>, QString <i>a9</i>)</h3><p>This function overloads <a href="qstring.html#arg">arg</a>().</p>
<p><i>fieldWidth</i> specifies the minimum amount of space that
<i>a</i> is padded to and filled with the character
<i>fillChar</i>. A positive value produces right-aligned text; a
negative value produces left-aligned text.</p>
<p>The <i>base</i> argument specifies the base to use when
converting the integer <i>a</i> to a string. The base must be
between 2 and 36, with 8 giving octal, 10 decimal, and 16
hexadecimal numbers.</p>
<p>If <i>fillChar</i> is '0' (the number 0, ASCII 48), the locale's
zero is used. For negative numbers, zero padding might appear
before the minus sign.</p>
<h3 class="fn"><a name="at" />QChar QString.at (<i>self</i>, int <i>i</i>)</h3><p>Returns the character at the given index <i>position</i> in the
string.</p>
<p>The <i>position</i> must be a valid index position in the string
(i.e., 0 <= <i>position</i> < <a href="qstring.html#size">size</a>()).</p>
<p><b>See also</b> <a href="qstring.html#operator-5b-5d">operator[]</a>().</p>
<h3 class="fn"><a name="capacity" />int QString.capacity (<i>self</i>)</h3><p>Returns the maximum number of characters that can be stored in
the string without forcing a reallocation.</p>
<p>The sole purpose of this function is to provide a means of fine
tuning <a href="qstring.html">QString</a>'s memory usage. In
general, you will rarely ever need to call this function. If you
want to know how many characters are in the string, call <a href="qstring.html#size">size</a>().</p>
<p><b>See also</b> <a href="qstring.html#reserve">reserve</a>() and
<a href="qstring.html#squeeze">squeeze</a>().</p>
<h3 class="fn"><a name="chop" />QString.chop (<i>self</i>, int <i>n</i>)</h3><p>Removes <i>n</i> characters from the end of the string.</p>
<p>If <i>n</i> is greater than <a href="qstring.html#size">size</a>(), the result is an empty string.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str(<span class="string">"LOGOUT\r\n"</span>);
str<span class="operator">.</span>chop(<span class="number">2</span>);
<span class="comment">// str == "LOGOUT"</span>
</pre>
<p>If you want to remove characters from the <i>beginning</i> of
the string, use <a href="qstring.html#remove">remove</a>()
instead.</p>
<p><b>See also</b> <a href="qstring.html#truncate">truncate</a>(),
<a href="qstring.html#resize">resize</a>(), and <a href="qstring.html#remove">remove</a>().</p>
<h3 class="fn"><a name="clear" />QString.clear (<i>self</i>)</h3><p>Clears the contents of the string and makes it empty.</p>
<p><b>See also</b> <a href="qstring.html#resize">resize</a>() and
<a href="qstring.html#isEmpty">isEmpty</a>().</p>
<h3 class="fn"><a name="compare" />int QString.compare (<i>self</i>, QString <i>s</i>)</h3><p>Compares <i>s1</i> with <i>s2</i> and returns an integer less
than, equal to, or greater than zero if <i>s1</i> is less than,
equal to, or greater than <i>s2</i>.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a>, the
comparison is case sensitive; otherwise the comparison is case
insensitive.</p>
<p>Case sensitive comparison is based exclusively on the numeric
Unicode values of the characters and is very fast, but is not what
a human would expect. Consider sorting user-visible strings with
<a href="qstring.html#localeAwareCompare">localeAwareCompare</a>().</p>
<pre class="cpp">
<span class="type">int</span> x <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>compare(<span class="string">"aUtO"</span><span class="operator">,</span> <span class="string">"AuTo"</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">.</span>CaseInsensitive); <span class="comment">// x == 0</span>
<span class="type">int</span> y <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>compare(<span class="string">"auto"</span><span class="operator">,</span> <span class="string">"Car"</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">.</span>CaseSensitive); <span class="comment">// y > 0</span>
<span class="type">int</span> z <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>compare(<span class="string">"auto"</span><span class="operator">,</span> <span class="string">"Car"</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">.</span>CaseInsensitive); <span class="comment">// z < 0</span>
</pre>
<p>This function was introduced in Qt 4.2.</p>
<p><b>See also</b> <a href="qstring.html#operator-eq-eq">operator==</a>(), <a href="qstring.html#operator-lt">operator<</a>(), and <a href="qstring.html#operator-gt">operator></a>().</p>
<h3 class="fn"><a name="compare-2" />int QString.compare (<i>self</i>, QString <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i>)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<p>Performs a case sensitive compare of <i>s1</i> and
<i>s2</i>.</p>
<h3 class="fn"><a name="compare-3" />int QString.compare (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>other</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<p>Performs a comparison of <i>s1</i> and <i>s2</i>, using the case
sensitivity setting <i>cs</i>.</p>
<p>This function was introduced in Qt 4.2.</p>
<h3 class="fn"><a name="compare-4" />int QString.compare (<i>self</i>, QStringRef <i>ref</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<p>Performs a comparison of <i>s1</i> and <i>s2</i>, using the case
sensitivity setting <i>cs</i>.</p>
<p>This function was introduced in Qt 4.2.</p>
<h3 class="fn"><a name="compare-5" />int QString.compare (QString <i>s1</i>, QString <i>s2</i>)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<p>Lexically compares this string with the <i>other</i> string and
returns an integer less than, equal to, or greater than zero if
this string is less than, equal to, or greater than the other
string.</p>
<p>Equivalent to <tt>compare(*this, other)</tt>.</p>
<h3 class="fn"><a name="compare-6" />int QString.compare (QString <i>s1</i>, QString <i>s2</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i>)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<p>Same as compare(*this, <i>other</i>, <i>cs</i>).</p>
<p>This function was introduced in Qt 4.2.</p>
<h3 class="fn"><a name="compare-7" />int QString.compare (QString <i>s1</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s2</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<p>Same as compare(*this, <i>other</i>, <i>cs</i>).</p>
<p>This function was introduced in Qt 4.2.</p>
<h3 class="fn"><a name="compare-8" />int QString.compare (<a href="qlatin1string.html">QLatin1String</a> <i>s1</i>, QString <i>s2</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<p>Compares the string reference, <i>ref</i>, with the string and
returns an integer less than, equal to, or greater than zero if the
string is less than, equal to, or greater than <i>ref</i>.</p>
<h3 class="fn"><a name="compare-9" />int QString.compare (QString <i>s1</i>, QStringRef <i>s2</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#compare">compare</a>().</p>
<h3 class="fn"><a name="contains" />bool QString.contains (<i>self</i>, QString <i>str</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Returns true if this string contains an occurrence of the string
<i>str</i>; otherwise returns false.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Peter Pan"</span>;
str<span class="operator">.</span>contains(<span class="string">"peter"</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">.</span>CaseInsensitive); <span class="comment">// returns true</span>
</pre>
<p><b>See also</b> <a href="qstring.html#indexOf">indexOf</a>() and
<a href="qstring.html#count">count</a>().</p>
<h3 class="fn"><a name="contains-2" />bool QString.contains (<i>self</i>, QStringRef <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Returns true if this string contains an occurrence of the string
reference <i>str</i>; otherwise returns false.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>This function was introduced in Qt 4.8.</p>
<p><b>See also</b> <a href="qstring.html#indexOf">indexOf</a>() and
<a href="qstring.html#count">count</a>().</p>
<h3 class="fn"><a name="contains-3" />bool QString.contains (<i>self</i>, <a href="qregexp.html">QRegExp</a> <i>rx</i>)</h3><h3 class="fn"><a name="count" />int QString.count (<i>self</i>)</h3><p>Returns the number of (potentially overlapping) occurrences of
the string <i>str</i> in this string.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p><b>See also</b> <a href="qstring.html#contains">contains</a>()
and <a href="qstring.html#indexOf">indexOf</a>().</p>
<h3 class="fn"><a name="count-2" />int QString.count (<i>self</i>, QString <i>str</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#count">count</a>().</p>
<p>Returns the number of occurrences of character <i>ch</i> in the
string.</p>
<h3 class="fn"><a name="count-3" />int QString.count (<i>self</i>, QStringRef <i>str</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#count">count</a>().</p>
<p>Returns the number of (potentially overlapping) occurrences of
the string reference <i>str</i> in this string.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>This function was introduced in Qt 4.8.</p>
<p><b>See also</b> <a href="qstring.html#contains">contains</a>()
and <a href="qstring.html#indexOf">indexOf</a>().</p>
<h3 class="fn"><a name="count-4" />int QString.count (<i>self</i>, <a href="qregexp.html">QRegExp</a>)</h3><p>This function overloads <a href="qstring.html#count">count</a>().</p>
<p>Returns the number of times the regular expression <i>rx</i>
matches in the string.</p>
<p>This function counts overlapping matches, so in the example
below, there are four instances of "ana" or "ama":</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"banana and panama"</span>;
str<span class="operator">.</span>count(<span class="type"><a href="qregexp.html">QRegExp</a></span>(<span class="string">"a[nm]a"</span>)); <span class="comment">// returns 4</span>
</pre>
<h3 class="fn"><a name="endsWith" />bool QString.endsWith (<i>self</i>, QString <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Returns true if the string ends with <i>s</i>; otherwise returns
false.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Bananas"</span>;
str<span class="operator">.</span>endsWith(<span class="string">"anas"</span>); <span class="comment">// returns true</span>
str<span class="operator">.</span>endsWith(<span class="string">"pple"</span>); <span class="comment">// returns false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#startsWith">startsWith</a>().</p>
<h3 class="fn"><a name="endsWith-2" />bool QString.endsWith (<i>self</i>, QStringRef <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><h3 class="fn"><a name="endsWith-3" />bool QString.endsWith (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#endsWith">endsWith</a>().</p>
<p>Returns true if the string ends with the string reference
<i>s</i>; otherwise returns false.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>This function was introduced in Qt 4.8.</p>
<p><b>See also</b> <a href="qstring.html#startsWith">startsWith</a>().</p>
<h3 class="fn"><a name="fill" />QString QString.fill (<i>self</i>, QChar <i>ch</i>, int <i>size</i> = -1)</h3><p>Sets every character in the string to character <i>ch</i>. If
<i>size</i> is different from -1 (default), the string is resized
to <i>size</i> beforehand.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Berlin"</span>;
str<span class="operator">.</span>fill(<span class="char">'z'</span>);
<span class="comment">// str == "zzzzzz"</span>
str<span class="operator">.</span>fill(<span class="char">'A'</span><span class="operator">,</span> <span class="number">2</span>);
<span class="comment">// str == "AA"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#resize">resize</a>().</p>
<h3 class="fn"><a name="fromAscii" />QString QString.fromAscii (str <i>str</i>, int <i>size</i> = -1)</h3><p>Returns a <a href="qstring.html">QString</a> initialized with
the first <i>size</i> characters from the string <i>str</i>.</p>
<p>If <i>size</i> is -1 (default), it is taken to be
qstrlen(<i>str</i>).</p>
<p>Note that, despite the name, this function actually uses the
codec defined by <a href="qtextcodec.html#setCodecForCStrings">QTextCodec.setCodecForCStrings</a>()
to convert <i>str</i> to Unicode. Depending on the codec, it may
not accept valid US-ASCII (ANSI X3.4-1986) input. If no codec has
been set, this function does the same as <a href="qstring.html#fromLatin1">fromLatin1</a>().</p>
<p><b>See also</b> <a href="qstring.html#toAscii">toAscii</a>(),
<a href="qstring.html#fromLatin1">fromLatin1</a>(), <a href="qstring.html#fromUtf8">fromUtf8</a>(), and <a href="qstring.html#fromLocal8Bit">fromLocal8Bit</a>().</p>
<h3 class="fn"><a name="fromLatin1" />QString QString.fromLatin1 (str <i>str</i>, int <i>size</i> = -1)</h3><p>Returns a <a href="qstring.html">QString</a> initialized with
the first <i>size</i> characters of the Latin-1 string
<i>str</i>.</p>
<p>If <i>size</i> is -1 (default), it is taken to be
qstrlen(<i>str</i>).</p>
<p><b>See also</b> <a href="qstring.html#toLatin1">toLatin1</a>(),
<a href="qstring.html#fromAscii">fromAscii</a>(), <a href="qstring.html#fromUtf8">fromUtf8</a>(), and <a href="qstring.html#fromLocal8Bit">fromLocal8Bit</a>().</p>
<h3 class="fn"><a name="fromLocal8Bit" />QString QString.fromLocal8Bit (str <i>str</i>, int <i>size</i> = -1)</h3><p>Returns a <a href="qstring.html">QString</a> initialized with
the first <i>size</i> characters of the 8-bit string
<i>str</i>.</p>
<p>If <i>size</i> is -1 (default), it is taken to be
qstrlen(<i>str</i>).</p>
<p><a href="qtextcodec.html#codecForLocale">QTextCodec.codecForLocale</a>()
is used to perform the conversion.</p>
<p><b>See also</b> <a href="qstring.html#toLocal8Bit">toLocal8Bit</a>(), <a href="qstring.html#fromAscii">fromAscii</a>(), <a href="qstring.html#fromLatin1">fromLatin1</a>(), and <a href="qstring.html#fromUtf8">fromUtf8</a>().</p>
<h3 class="fn"><a name="fromUtf8" />QString QString.fromUtf8 (str <i>str</i>, int <i>size</i> = -1)</h3><p>Returns a <a href="qstring.html">QString</a> initialized with
the first <i>size</i> bytes of the UTF-8 string <i>str</i>.</p>
<p>If <i>size</i> is -1 (default), it is taken to be
qstrlen(<i>str</i>).</p>
<p>UTF-8 is a Unicode codec and can represent all characters in a
Unicode string like <a href="qstring.html">QString</a>. However,
invalid sequences are possible with UTF-8 and, if any such are
found, they will be replaced with one or more "replacement
characters", or suppressed. These include non-Unicode sequences,
non-characters, overlong sequences or surrogate codepoints encoded
into UTF-8.</p>
<p>Non-characters are codepoints that the Unicode standard reserves
and must not be used in text interchange. They are the last two
codepoints in each Unicode Plane (U+FFFE, U+FFFF, U+1FFFE, U+1FFFF,
U+2FFFE, etc.), as well as 16 codepoints in the range
U+FDD0..U+FDDF, inclusive.</p>
<p><b>See also</b> <a href="qstring.html#toUtf8">toUtf8</a>(),
<a href="qstring.html#fromAscii">fromAscii</a>(), <a href="qstring.html#fromLatin1">fromLatin1</a>(), and <a href="qstring.html#fromLocal8Bit">fromLocal8Bit</a>().</p>
<h3 class="fn"><a name="indexOf" />int QString.indexOf (<i>self</i>, QString <i>str</i>, int <i>from</i> = 0, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Returns the index position of the first occurrence of the string
<i>str</i> in this string, searching forward from index position
<i>from</i>. Returns -1 if <i>str</i> is not found.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"sticky question"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> <span class="string">"sti"</span>;
x<span class="operator">.</span>indexOf(y); <span class="comment">// returns 0</span>
x<span class="operator">.</span>indexOf(y<span class="operator">,</span> <span class="number">1</span>); <span class="comment">// returns 10</span>
x<span class="operator">.</span>indexOf(y<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// returns 10</span>
x<span class="operator">.</span>indexOf(y<span class="operator">,</span> <span class="number">11</span>); <span class="comment">// returns -1</span>
</pre>
<p>If <i>from</i> is -1, the search starts at the last character;
if it is -2, at the next to last character and so on.</p>
<p><b>See also</b> <a href="qstring.html#lastIndexOf">lastIndexOf</a>(), <a href="qstring.html#contains">contains</a>(), and <a href="qstring.html#count">count</a>().</p>
<h3 class="fn"><a name="indexOf-2" />int QString.indexOf (<i>self</i>, QStringRef <i>str</i>, int <i>from</i> = 0, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Returns the index position of the first occurrence of the string
<i>str</i> in this string, searching forward from index position
<i>from</i>. Returns -1 if <i>str</i> is not found.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"sticky question"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> <span class="string">"sti"</span>;
x<span class="operator">.</span>indexOf(y); <span class="comment">// returns 0</span>
x<span class="operator">.</span>indexOf(y<span class="operator">,</span> <span class="number">1</span>); <span class="comment">// returns 10</span>
x<span class="operator">.</span>indexOf(y<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// returns 10</span>
x<span class="operator">.</span>indexOf(y<span class="operator">,</span> <span class="number">11</span>); <span class="comment">// returns -1</span>
</pre>
<p>If <i>from</i> is -1, the search starts at the last character;
if it is -2, at the next to last character and so on.</p>
<p>This function was introduced in Qt 4.5.</p>
<p><b>See also</b> <a href="qstring.html#lastIndexOf">lastIndexOf</a>(), <a href="qstring.html#contains">contains</a>(), and <a href="qstring.html#count">count</a>().</p>
<h3 class="fn"><a name="indexOf-3" />int QString.indexOf (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>str</i>, int <i>from</i> = 0, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#indexOf">indexOf</a>().</p>
<p>Returns the index position of the first occurrence of the
character <i>ch</i> in the string, searching forward from index
position <i>from</i>. Returns -1 if <i>ch</i> could not be
found.</p>
<h3 class="fn"><a name="indexOf-4" />int QString.indexOf (<i>self</i>, <a href="qregexp.html">QRegExp</a> <i>rx</i>, int <i>from</i> = 0)</h3><p>This function overloads <a href="qstring.html#indexOf">indexOf</a>().</p>
<p>Returns the index position of the first occurrence of the string
reference <i>str</i> in this string, searching forward from index
position <i>from</i>. Returns -1 if <i>str</i> is not found.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>This function was introduced in Qt 4.8.</p>
<h3 class="fn"><a name="insert" />QString QString.insert (<i>self</i>, int <i>i</i>, QString <i>s</i>)</h3><p>Inserts the string <i>str</i> at the given index <i>position</i>
and returns a reference to this string.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Meal"</span>;
str<span class="operator">.</span>insert(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"ontr"</span>));
<span class="comment">// str == "Montreal"</span>
</pre>
<p>If the given <i>position</i> is greater than <a href="qstring.html#size">size</a>(), the array is first extended using
<a href="qstring.html#resize">resize</a>().</p>
<p><b>See also</b> <a href="qstring.html#append">append</a>(),
<a href="qstring.html#prepend">prepend</a>(), <a href="qstring.html#replace">replace</a>(), and <a href="qstring.html#remove">remove</a>().</p>
<h3 class="fn"><a name="insert-2" />QString QString.insert (<i>self</i>, int <i>i</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><p>This function overloads <a href="qstring.html#insert">insert</a>().</p>
<p>Inserts the Latin-1 string <i>str</i> at the given index
<i>position</i>.</p>
<h3 class="fn"><a name="isEmpty" />bool QString.isEmpty (<i>self</i>)</h3><p>Returns true if the string has no characters; otherwise returns
false.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span>()<span class="operator">.</span>isEmpty(); <span class="comment">// returns true</span>
<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">""</span>)<span class="operator">.</span>isEmpty(); <span class="comment">// returns true</span>
<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"x"</span>)<span class="operator">.</span>isEmpty(); <span class="comment">// returns false</span>
<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"abc"</span>)<span class="operator">.</span>isEmpty(); <span class="comment">// returns false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#size">size</a>().</p>
<h3 class="fn"><a name="isNull" />bool QString.isNull (<i>self</i>)</h3><p>Returns true if this string is null; otherwise returns
false.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span>()<span class="operator">.</span>isNull(); <span class="comment">// returns true</span>
<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">""</span>)<span class="operator">.</span>isNull(); <span class="comment">// returns false</span>
<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"abc"</span>)<span class="operator">.</span>isNull(); <span class="comment">// returns false</span>
</pre>
<p>Qt makes a distinction between null strings and empty strings
for historical reasons. For most applications, what matters is
whether or not a string contains any data, and this can be
determined using the <a href="qstring.html#isEmpty">isEmpty</a>()
function.</p>
<p><b>See also</b> <a href="qstring.html#isEmpty">isEmpty</a>().</p>
<h3 class="fn"><a name="isRightToLeft" />bool QString.isRightToLeft (<i>self</i>)</h3><p>Returns true if the string is read right to left.</p>
<h3 class="fn"><a name="isSimpleText" />bool QString.isSimpleText (<i>self</i>)</h3><h3 class="fn"><a name="lastIndexOf" />int QString.lastIndexOf (<i>self</i>, QString <i>str</i>, int <i>from</i> = -1, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Returns the index position of the last occurrence of the string
<i>str</i> in this string, searching backward from index position
<i>from</i>. If <i>from</i> is -1 (default), the search starts at
the last character; if <i>from</i> is -2, at the next to last
character and so on. Returns -1 if <i>str</i> is not found.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"crazy azimuths"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> <span class="string">"az"</span>;
x<span class="operator">.</span>lastIndexOf(y); <span class="comment">// returns 6</span>
x<span class="operator">.</span>lastIndexOf(y<span class="operator">,</span> <span class="number">6</span>); <span class="comment">// returns 6</span>
x<span class="operator">.</span>lastIndexOf(y<span class="operator">,</span> <span class="number">5</span>); <span class="comment">// returns 2</span>
x<span class="operator">.</span>lastIndexOf(y<span class="operator">,</span> <span class="number">1</span>); <span class="comment">// returns -1</span>
</pre>
<p><b>See also</b> <a href="qstring.html#indexOf">indexOf</a>(),
<a href="qstring.html#contains">contains</a>(), and <a href="qstring.html#count">count</a>().</p>
<h3 class="fn"><a name="lastIndexOf-2" />int QString.lastIndexOf (<i>self</i>, QStringRef <i>str</i>, int <i>from</i> = -1, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#lastIndexOf">lastIndexOf</a>().</p>
<p>Returns the index position of the last occurrence of the string
<i>str</i> in this string, searching backward from index position
<i>from</i>. If <i>from</i> is -1 (default), the search starts at
the last character; if <i>from</i> is -2, at the next to last
character and so on. Returns -1 if <i>str</i> is not found.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"crazy azimuths"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> <span class="string">"az"</span>;
x<span class="operator">.</span>lastIndexOf(y); <span class="comment">// returns 6</span>
x<span class="operator">.</span>lastIndexOf(y<span class="operator">,</span> <span class="number">6</span>); <span class="comment">// returns 6</span>
x<span class="operator">.</span>lastIndexOf(y<span class="operator">,</span> <span class="number">5</span>); <span class="comment">// returns 2</span>
x<span class="operator">.</span>lastIndexOf(y<span class="operator">,</span> <span class="number">1</span>); <span class="comment">// returns -1</span>
</pre>
<p>This function was introduced in Qt 4.5.</p>
<p><b>See also</b> <a href="qstring.html#indexOf">indexOf</a>(),
<a href="qstring.html#contains">contains</a>(), and <a href="qstring.html#count">count</a>().</p>
<h3 class="fn"><a name="lastIndexOf-3" />int QString.lastIndexOf (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>str</i>, int <i>from</i> = -1, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#lastIndexOf">lastIndexOf</a>().</p>
<p>Returns the index position of the last occurrence of the
character <i>ch</i>, searching backward from position
<i>from</i>.</p>
<h3 class="fn"><a name="lastIndexOf-4" />int QString.lastIndexOf (<i>self</i>, <a href="qregexp.html">QRegExp</a> <i>rx</i>, int <i>from</i> = -1)</h3><p>This function overloads <a href="qstring.html#lastIndexOf">lastIndexOf</a>().</p>
<p>Returns the index position of the last occurrence of the string
reference <i>str</i> in this string, searching backward from index
position <i>from</i>. If <i>from</i> is -1 (default), the search
starts at the last character; if <i>from</i> is -2, at the next to
last character and so on. Returns -1 if <i>str</i> is not
found.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>This function was introduced in Qt 4.8.</p>
<p><b>See also</b> <a href="qstring.html#indexOf">indexOf</a>(),
<a href="qstring.html#contains">contains</a>(), and <a href="qstring.html#count">count</a>().</p>
<h3 class="fn"><a name="left" />QString QString.left (<i>self</i>, int <i>len</i>)</h3><p>Returns a substring that contains the <i>n</i> leftmost
characters of the string.</p>
<p>The entire string is returned if <i>n</i> is greater than
<a href="qstring.html#size">size</a>() or less than zero.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"Pineapple"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> x<span class="operator">.</span>left(<span class="number">4</span>); <span class="comment">// y == "Pine"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#right">right</a>(),
<a href="qstring.html#mid">mid</a>(), and <a href="qstring.html#startsWith">startsWith</a>().</p>
<h3 class="fn"><a name="leftJustified" />QString QString.leftJustified (<i>self</i>, int <i>width</i>, QChar <i>fillChar</i> = QLatin1Char(' '), bool <i>truncate</i> = False)</h3><p>Returns a string of size <i>width</i> that contains this string
padded by the <i>fill</i> character.</p>
<p>If <i>truncate</i> is false and the <a href="qstring.html#size">size</a>() of the string is more than
<i>width</i>, then the returned string is a copy of the string.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> <span class="string">"apple"</span>;
<span class="type"><a href="qstring.html">QString</a></span> t <span class="operator">=</span> s<span class="operator">.</span>leftJustified(<span class="number">8</span><span class="operator">,</span> <span class="char">'.'</span>); <span class="comment">// t == "apple..."</span>
</pre>
<p>If <i>truncate</i> is true and the <a href="qstring.html#size">size</a>() of the string is more than
<i>width</i>, then any characters in a copy of the string after
position <i>width</i> are removed, and the copy is returned.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Pineapple"</span>;
str <span class="operator">=</span> str<span class="operator">.</span>leftJustified(<span class="number">5</span><span class="operator">,</span> <span class="char">'.'</span><span class="operator">,</span> <span class="keyword">true</span>); <span class="comment">// str == "Pinea"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#rightJustified">rightJustified</a>().</p>
<h3 class="fn"><a name="length" />int QString.length (<i>self</i>)</h3><p>Returns the number of characters in this string. Equivalent to
<a href="qstring.html#size">size</a>().</p>
<p><b>See also</b> <a class="compat" href="qstring-qt3.html#setLength">setLength</a>() and <a href="qstring.html#resize">resize</a>().</p>
<h3 class="fn"><a name="localeAwareCompare" />int QString.localeAwareCompare (<i>self</i>, QString <i>s</i>)</h3><p>Compares <i>s1</i> with <i>s2</i> and returns an integer less
than, equal to, or greater than zero if <i>s1</i> is less than,
equal to, or greater than <i>s2</i>.</p>
<p>The comparison is performed in a locale- and also
platform-dependent manner. Use this function to present sorted
lists of strings to the user.</p>
<p>On Mac OS X since Qt 4.3, this function compares according the
"Order for sorted lists" setting in the International prefereces
panel.</p>
<p><b>See also</b> <a href="qstring.html#compare">compare</a>() and
<a class="compat" href="qtextcodec-qt3.html#locale">QTextCodec.locale</a>().</p>
<h3 class="fn"><a name="localeAwareCompare-2" />int QString.localeAwareCompare (<i>self</i>, QStringRef <i>s</i>)</h3><p>This function overloads <a href="qstring.html#localeAwareCompare">localeAwareCompare</a>().</p>
<p>Compares this string with the <i>other</i> string and returns an
integer less than, equal to, or greater than zero if this string is
less than, equal to, or greater than the <i>other</i> string.</p>
<p>The comparison is performed in a locale- and also
platform-dependent manner. Use this function to present sorted
lists of strings to the user.</p>
<p>Same as <tt>localeAwareCompare(*this, other)</tt>.</p>
<p>This function was introduced in Qt 4.5.</p>
<h3 class="fn"><a name="localeAwareCompare-3" />int QString.localeAwareCompare (QString <i>s1</i>, QString <i>s2</i>)</h3><p>This function overloads <a href="qstring.html#localeAwareCompare">localeAwareCompare</a>().</p>
<p>Compares <i>s1</i> with <i>s2</i> and returns an integer less
than, equal to, or greater than zero if <i>s1</i> is less than,
equal to, or greater than <i>s2</i>.</p>
<p>The comparison is performed in a locale- and also
platform-dependent manner. Use this function to present sorted
lists of strings to the user.</p>
<p>This function was introduced in Qt 4.5.</p>
<h3 class="fn"><a name="localeAwareCompare-4" />int QString.localeAwareCompare (QString <i>s1</i>, QStringRef <i>s2</i>)</h3><p>This function overloads <a href="qstring.html#localeAwareCompare">localeAwareCompare</a>().</p>
<p>Compares this string with the <i>other</i> string and returns an
integer less than, equal to, or greater than zero if this string is
less than, equal to, or greater than the <i>other</i> string.</p>
<p>The comparison is performed in a locale- and also
platform-dependent manner. Use this function to present sorted
lists of strings to the user.</p>
<p>Same as <tt>localeAwareCompare(*this, other)</tt>.</p>
<h3 class="fn"><a name="mid" />QString QString.mid (<i>self</i>, int <i>position</i>, int <i>n</i> = -1)</h3><p>Returns a string that contains <i>n</i> characters of this
string, starting at the specified <i>position</i> index.</p>
<p>Returns a null string if the <i>position</i> index exceeds the
length of the string. If there are less than <i>n</i> characters
available in the string starting at the given <i>position</i>, or
if <i>n</i> is -1 (default), the function returns all characters
that are available from the specified <i>position</i>.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"Nine pineapples"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> x<span class="operator">.</span>mid(<span class="number">5</span><span class="operator">,</span> <span class="number">4</span>); <span class="comment">// y == "pine"</span>
<span class="type"><a href="qstring.html">QString</a></span> z <span class="operator">=</span> x<span class="operator">.</span>mid(<span class="number">5</span>); <span class="comment">// z == "pineapples"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#left">left</a>() and
<a href="qstring.html#right">right</a>().</p>
<h3 class="fn"><a name="normalized" />QString QString.normalized (<i>self</i>, <a href="qstring.html#NormalizationForm-enum">NormalizationForm</a> <i>mode</i>)</h3><p>Returns the string in the given Unicode normalization
<i>mode</i>.</p>
<h3 class="fn"><a name="normalized-2" />QString QString.normalized (<i>self</i>, <a href="qstring.html#NormalizationForm-enum">NormalizationForm</a> <i>mode</i>, <a href="qchar.html#UnicodeVersion-enum">QChar.UnicodeVersion</a> <i>version</i>)</h3><p>This is an overloaded function.</p>
<p>Returns the string in the given Unicode normalization
<i>mode</i>, according to the given <i>version</i> of the Unicode
standard.</p>
<h3 class="fn"><a name="number" />QString QString.number (int <i>n</i>, int <i>base</i> = 10)</h3><p>Returns a string equivalent of the number <i>n</i> according to
the specified <i>base</i>.</p>
<p>The base is 10 by default and must be between 2 and 36. For
bases other than 10, <i>n</i> is treated as an unsigned
integer.</p>
<pre class="cpp">
<span class="type">long</span> a <span class="operator">=</span> <span class="number">63</span>;
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>number(a<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// s == "3f"</span>
<span class="type"><a href="qstring.html">QString</a></span> t <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>number(a<span class="operator">,</span> <span class="number">16</span>)<span class="operator">.</span>toUpper(); <span class="comment">// t == "3F"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#setNum">setNum</a>().</p>
<h3 class="fn"><a name="number-2" />QString QString.number (float <i>n</i>, str <i>format</i> = 'g', int <i>precision</i> = 6)</h3><p>Returns a string equivalent of the number <i>n</i>, formatted
according to the specified <i>format</i> and <i>precision</i>. See
<a href="qstring.html#argument-formats">Argument Formats</a> for
details.</p>
<p>Unlike <a href="qlocale.html#toString">QLocale.toString</a>(),
this function does not honor the user's locale settings.</p>
<p><b>See also</b> <a href="qstring.html#setNum">setNum</a>() and
<a href="qlocale.html#toString">QLocale.toString</a>().</p>
<h3 class="fn"><a name="number-3" />QString QString.number (int <i>n</i>, int <i>base</i> = 10)</h3><p>This is an overloaded function.</p>
<h3 class="fn"><a name="number-4" />QString QString.number (int <i>n</i>, int <i>base</i> = 10)</h3><p>This is an overloaded function.</p>
<h3 class="fn"><a name="prepend" />QString QString.prepend (<i>self</i>, QString <i>s</i>)</h3><p>Prepends the string <i>str</i> to the beginning of this string
and returns a reference to this string.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"ship"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> <span class="string">"air"</span>;
x<span class="operator">.</span>prepend(y);
<span class="comment">// x == "airship"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#append">append</a>() and
<a href="qstring.html#insert">insert</a>().</p>
<h3 class="fn"><a name="prepend-2" />QString QString.prepend (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><p>This function overloads <a href="qstring.html#prepend">prepend</a>().</p>
<p>Prepends the Latin-1 string <i>str</i> to this string.</p>
<h3 class="fn"><a name="prepend-3" />QString QString.prepend (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><p>This function overloads <a href="qstring.html#prepend">prepend</a>().</p>
<p>Prepends the byte array <i>ba</i> to this string. The byte array
is converted to Unicode using the <a href="qstring.html#fromAscii">fromAscii</a>() function.</p>
<p>You can disable this function by defining
<tt>QT_NO_CAST_FROM_ASCII</tt> when you compile your applications.
This can be useful if you want to ensure that all user-visible
strings go through <a href="qobject.html#tr">QObject.tr</a>(), for
example.</p>
<h3 class="fn"><a name="push_back" />QString.push_back (<i>self</i>, QString <i>s</i>)</h3><p>This function is provided for STL compatibility, appending the
given <i>other</i> string onto the end of this string. It is
equivalent to <tt>append(other)</tt>.</p>
<p><b>See also</b> <a href="qstring.html#append">append</a>().</p>
<h3 class="fn"><a name="push_front" />QString.push_front (<i>self</i>, QString <i>s</i>)</h3><p>This function is provided for STL compatibility, prepending the
given <i>other</i> string to the beginning of this string. It is
equivalent to <tt>prepend(other)</tt>.</p>
<p><b>See also</b> <a href="qstring.html#prepend">prepend</a>().</p>
<h3 class="fn"><a name="remove" />QString QString.remove (<i>self</i>, int <i>i</i>, int <i>len</i>)</h3><p>Removes <i>n</i> characters from the string, starting at the
given <i>position</i> index, and returns a reference to the
string.</p>
<p>If the specified <i>position</i> index is within the string, but
<i>position</i> + <i>n</i> is beyond the end of the string, the
string is truncated at the specified <i>position</i>.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> <span class="string">"Montreal"</span>;
s<span class="operator">.</span>remove(<span class="number">1</span><span class="operator">,</span> <span class="number">4</span>);
<span class="comment">// s == "Meal"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#insert">insert</a>() and
<a href="qstring.html#replace">replace</a>().</p>
<h3 class="fn"><a name="remove-2" />QString QString.remove (<i>self</i>, QString <i>str</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Removes every occurrence of the character <i>ch</i> in this
string, and returns a reference to this string.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> t <span class="operator">=</span> <span class="string">"Ali Baba"</span>;
t<span class="operator">.</span>remove(<span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'a'</span>)<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">.</span>CaseInsensitive);
<span class="comment">// t == "li Bb"</span>
</pre>
<p>This is the same as <tt>replace(ch, "", cs)</tt>.</p>
<p><b>See also</b> <a href="qstring.html#replace">replace</a>().</p>
<h3 class="fn"><a name="remove-3" />QString QString.remove (<i>self</i>, <a href="qregexp.html">QRegExp</a> <i>rx</i>)</h3><p>Removes every occurrence of the given <i>str</i> string in this
string, and returns a reference to this string.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<p>This is the same as <tt>replace(str, "", cs)</tt>.</p>
<p><b>See also</b> <a href="qstring.html#replace">replace</a>().</p>
<h3 class="fn"><a name="repeated" />QString QString.repeated (<i>self</i>, int <i>times</i>)</h3><p>Returns a copy of this string repeated the specified number of
<i>times</i>.</p>
<p>If <i>times</i> is less than 1, an empty string is returned.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str(<span class="string">"ab"</span>);
str<span class="operator">.</span>repeated(<span class="number">4</span>); <span class="comment">// returns "abababab"</span>
</pre>
<p>This function was introduced in Qt 4.5.</p>
<h3 class="fn"><a name="replace" />QString QString.replace (<i>self</i>, int <i>i</i>, int <i>len</i>, QString <i>after</i>)</h3><p>Replaces <i>n</i> characters beginning at index <i>position</i>
with the string <i>after</i> and returns a reference to this
string.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"Say yes!"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> <span class="string">"no"</span>;
x<span class="operator">.</span>replace(<span class="number">4</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> y);
<span class="comment">// x == "Say no!"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#insert">insert</a>() and
<a href="qstring.html#remove">remove</a>().</p>
<h3 class="fn"><a name="replace-2" />QString QString.replace (<i>self</i>, QString <i>before</i>, QString <i>after</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><h3 class="fn"><a name="replace-3" />QString QString.replace (<i>self</i>, <a href="qregexp.html">QRegExp</a> <i>rx</i>, QString <i>after</i>)</h3><h3 class="fn"><a name="replace-4" />QString QString.replace (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>before</i>, <a href="qlatin1string.html">QLatin1String</a> <i>after</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><h3 class="fn"><a name="replace-5" />QString QString.replace (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>before</i>, QString <i>after</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><h3 class="fn"><a name="replace-6" />QString QString.replace (<i>self</i>, QString <i>before</i>, <a href="qlatin1string.html">QLatin1String</a> <i>after</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#replace">replace</a>().</p>
<p>Replaces <i>n</i> characters beginning at index <i>position</i>
with the first <i>size</i> characters of the <a href="qchar.html">QChar</a> array <i>unicode</i> and returns a reference
to this string.</p>
<h3 class="fn"><a name="reserve" />QString.reserve (<i>self</i>, int <i>asize</i>)</h3><p>Attempts to allocate memory for at least <i>size</i> characters.
If you know in advance how large the string will be, you can call
this function, and if you resize the string often you are likely to
get better performance. If <i>size</i> is an underestimate, the
worst that will happen is that the <a href="qstring.html">QString</a> will be a bit slower.</p>
<p>The sole purpose of this function is to provide a means of fine
tuning <a href="qstring.html">QString</a>'s memory usage. In
general, you will rarely ever need to call this function. If you
want to change the size of the string, call <a href="qstring.html#resize">resize</a>().</p>
<p>This function is useful for code that needs to build up a long
string and wants to avoid repeated reallocation. In this example,
we want to add to the string until some condition is true, and
we're fairly sure that size is large enough to make a call to
reserve() worthwhile:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> result;
<span class="type">int</span> maxSize;
<span class="type">bool</span> condition;
<span class="type"><a href="qchar.html">QChar</a></span> nextChar;
result<span class="operator">.</span>reserve(maxSize);
<span class="keyword">while</span> (condition)
result<span class="operator">.</span>append(nextChar);
result<span class="operator">.</span>squeeze();
</pre>
<p><b>See also</b> <a href="qstring.html#squeeze">squeeze</a>() and
<a href="qstring.html#capacity">capacity</a>().</p>
<h3 class="fn"><a name="resize" />QString.resize (<i>self</i>, int <i>size</i>)</h3><p>Sets the size of the string to <i>size</i> characters.</p>
<p>If <i>size</i> is greater than the current size, the string is
extended to make it <i>size</i> characters long with the extra
characters added to the end. The new characters are
uninitialized.</p>
<p>If <i>size</i> is less than the current size, characters are
removed from the end.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> <span class="string">"Hello world"</span>;
s<span class="operator">.</span>resize(<span class="number">5</span>);
<span class="comment">// s == "Hello"</span>
s<span class="operator">.</span>resize(<span class="number">8</span>);
<span class="comment">// s == "Hello???" (where ? stands for any character)</span>
</pre>
<p>If you want to append a certain number of identical characters
to the string, use <a href="qstring.html#operator-2b-eq">operator+=</a>() as follows rather
than resize():</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> t <span class="operator">=</span> <span class="string">"Hello"</span>;
t <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="number">10</span><span class="operator">,</span> <span class="char">'X'</span>);
<span class="comment">// t == "HelloXXXXXXXXXX"</span>
</pre>
<p>If you want to expand the string so that it reaches a certain
width and fill the new positions with a particular character, use
the <a href="qstring.html#leftJustified">leftJustified</a>()
function:</p>
<p>If <i>size</i> is negative, it is equivalent to passing
zero.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> r <span class="operator">=</span> <span class="string">"Hello"</span>;
r <span class="operator">=</span> r<span class="operator">.</span>leftJustified(<span class="number">10</span><span class="operator">,</span> <span class="char">' '</span>);
<span class="comment">// r == "Hello "</span>
</pre>
<p><b>See also</b> <a href="qstring.html#truncate">truncate</a>()
and <a href="qstring.html#reserve">reserve</a>().</p>
<h3 class="fn"><a name="right" />QString QString.right (<i>self</i>, int <i>len</i>)</h3><p>Returns a substring that contains the <i>n</i> rightmost
characters of the string.</p>
<p>The entire string is returned if <i>n</i> is greater than
<a href="qstring.html#size">size</a>() or less than zero.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> x <span class="operator">=</span> <span class="string">"Pineapple"</span>;
<span class="type"><a href="qstring.html">QString</a></span> y <span class="operator">=</span> x<span class="operator">.</span>right(<span class="number">5</span>); <span class="comment">// y == "apple"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#left">left</a>(), <a href="qstring.html#mid">mid</a>(), and <a href="qstring.html#endsWith">endsWith</a>().</p>
<h3 class="fn"><a name="rightJustified" />QString QString.rightJustified (<i>self</i>, int <i>width</i>, QChar <i>fillChar</i> = QLatin1Char(' '), bool <i>truncate</i> = False)</h3><p>Returns a string of <a href="qstring.html#size">size</a>()
<i>width</i> that contains the <i>fill</i> character followed by
the string. For example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> <span class="string">"apple"</span>;
<span class="type"><a href="qstring.html">QString</a></span> t <span class="operator">=</span> s<span class="operator">.</span>rightJustified(<span class="number">8</span><span class="operator">,</span> <span class="char">'.'</span>); <span class="comment">// t == "...apple"</span>
</pre>
<p>If <i>truncate</i> is false and the <a href="qstring.html#size">size</a>() of the string is more than
<i>width</i>, then the returned string is a copy of the string.</p>
<p>If <i>truncate</i> is true and the <a href="qstring.html#size">size</a>() of the string is more than
<i>width</i>, then the resulting string is truncated at position
<i>width</i>.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Pineapple"</span>;
str <span class="operator">=</span> str<span class="operator">.</span>rightJustified(<span class="number">5</span><span class="operator">,</span> <span class="char">'.'</span><span class="operator">,</span> <span class="keyword">true</span>); <span class="comment">// str == "Pinea"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#leftJustified">leftJustified</a>().</p>
<h3 class="fn"><a name="section" />QString QString.section (<i>self</i>, QString <i>sep</i>, int <i>start</i>, int <i>end</i> = -1, <a href="qstring-sectionflags.html">SectionFlags</a> <i>flags</i> = QString.SectionDefault)</h3><p>This function returns a section of the string.</p>
<p>This string is treated as a sequence of fields separated by the
character, <i>sep</i>. The returned string consists of the fields
from position <i>start</i> to position <i>end</i> inclusive. If
<i>end</i> is not specified, all fields from position <i>start</i>
to the end of the string are included. Fields are numbered 0, 1, 2,
etc., counting from the left, and -1, -2, etc., counting from right
to left.</p>
<p>The <i>flags</i> argument can be used to affect some aspects of
the function's behavior, e.g. whether to be case sensitive, whether
to skip empty fields and how to deal with leading and trailing
separators; see <a href="qstring.html#SectionFlag-enum">SectionFlags</a>.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str;
<span class="type"><a href="qstring.html">QString</a></span> csv <span class="operator">=</span> <span class="string">"forename,middlename,surname,phone"</span>;
<span class="type"><a href="qstring.html">QString</a></span> path <span class="operator">=</span> <span class="string">"/usr/local/bin/myapp"</span>; <span class="comment">// First field is empty</span>
<span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>SectionFlag flag <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>SectionSkipEmpty;
str <span class="operator">=</span> csv<span class="operator">.</span>section(<span class="char">','</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">2</span>); <span class="comment">// str == "surname"</span>
str <span class="operator">=</span> path<span class="operator">.</span>section(<span class="char">'/'</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">4</span>); <span class="comment">// str == "bin/myapp"</span>
str <span class="operator">=</span> path<span class="operator">.</span>section(<span class="char">'/'</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> flag); <span class="comment">// str == "myapp"</span>
</pre>
<p>If <i>start</i> or <i>end</i> is negative, we count fields from
the right of the string, the right-most field being -1, the one
from right-most field being -2, and so on.</p>
<pre class="cpp">
str <span class="operator">=</span> csv<span class="operator">.</span>section(<span class="char">','</span><span class="operator">,</span> <span class="operator">-</span><span class="number">3</span><span class="operator">,</span> <span class="operator">-</span><span class="number">2</span>); <span class="comment">// str == "middlename,surname"</span>
str <span class="operator">=</span> path<span class="operator">.</span>section(<span class="char">'/'</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>); <span class="comment">// str == "myapp"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#split">split</a>().</p>
<h3 class="fn"><a name="section-2" />QString QString.section (<i>self</i>, <a href="qregexp.html">QRegExp</a> <i>reg</i>, int <i>start</i>, int <i>end</i> = -1, <a href="qstring-sectionflags.html">SectionFlags</a> <i>flags</i> = QString.SectionDefault)</h3><p>This function overloads <a href="qstring.html#section">section</a>().</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str;
<span class="type"><a href="qstring.html">QString</a></span> data <span class="operator">=</span> <span class="string">"forename**middlename**surname**phone"</span>;
str <span class="operator">=</span> data<span class="operator">.</span>section(<span class="string">"**"</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">2</span>); <span class="comment">// str == "surname"</span>
str <span class="operator">=</span> data<span class="operator">.</span>section(<span class="string">"**"</span><span class="operator">,</span> <span class="operator">-</span><span class="number">3</span><span class="operator">,</span> <span class="operator">-</span><span class="number">2</span>); <span class="comment">// str == "middlename**surname"</span>
</pre>
<p><b>See also</b> <a href="qstring.html#split">split</a>().</p>
<h3 class="fn"><a name="setNum" />QString QString.setNum (<i>self</i>, int <i>n</i>, int <i>base</i> = 10)</h3><p>Sets the string to the printed value of <i>n</i> in the
specified <i>base</i>, and returns a reference to the string.</p>
<p>The base is 10 by default and must be between 2 and 36. For
bases other than 10, <i>n</i> is treated as an unsigned
integer.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str;
str<span class="operator">.</span>setNum(<span class="number">1234</span>); <span class="comment">// str == "1234"</span>
</pre>
<p>The formatting always uses <a href="qlocale.html#Language-enum">QLocale.C</a>, i.e.,
English/UnitedStates. To get a localized string representation of a
number, use <a href="qlocale.html#toString">QLocale.toString</a>()
with the appropriate locale.</p>
<h3 class="fn"><a name="setNum-2" />QString QString.setNum (<i>self</i>, float <i>n</i>, str <i>format</i> = 'g', int <i>precision</i> = 6)</h3><p>This is an overloaded function.</p>
<h3 class="fn"><a name="setNum-3" />QString QString.setNum (<i>self</i>, int <i>n</i>, int <i>base</i> = 10)</h3><p>This is an overloaded function.</p>
<h3 class="fn"><a name="setNum-4" />QString QString.setNum (<i>self</i>, int <i>n</i>, int <i>base</i> = 10)</h3><p>This is an overloaded function.</p>
<h3 class="fn"><a name="simplified" />QString QString.simplified (<i>self</i>)</h3><p>Returns a string that has whitespace removed from the start and
the end, and that has each sequence of internal whitespace replaced
with a single space.</p>
<p>Whitespace means any character for which <a href="qchar.html#isSpace">QChar.isSpace</a>() returns true. This
includes the ASCII characters '\t', '\n', '\v', '\f', '\r', and '
'.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">" lots\t of\nwhitespace\r\n "</span>;
str <span class="operator">=</span> str<span class="operator">.</span>simplified();
<span class="comment">// str == "lots of whitespace";</span>
</pre>
<p><b>See also</b> <a href="qstring.html#trimmed">trimmed</a>().</p>
<h3 class="fn"><a name="size" />int QString.size (<i>self</i>)</h3><p>Returns the number of characters in this string.</p>
<p>The last character in the string is at position size() - 1. In
addition, <a href="qstring.html">QString</a> ensures that the
character at position size() is always '\0', so that you can use
the return value of <a href="qstring.html#data">data</a>() and
<a href="qstring.html#constData">constData</a>() as arguments to
functions that expect '\0'-terminated strings.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"World"</span>;
<span class="type">int</span> n <span class="operator">=</span> str<span class="operator">.</span>size(); <span class="comment">// n == 5</span>
str<span class="operator">.</span>data()<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>; <span class="comment">// returns 'W'</span>
str<span class="operator">.</span>data()<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>; <span class="comment">// returns 'd'</span>
str<span class="operator">.</span>data()<span class="operator">[</span><span class="number">5</span><span class="operator">]</span>; <span class="comment">// returns '\0'</span>
</pre>
<p><b>See also</b> <a href="qstring.html#isEmpty">isEmpty</a>() and
<a href="qstring.html#resize">resize</a>().</p>
<h3 class="fn"><a name="split" />QStringList QString.split (<i>self</i>, QString <i>sep</i>, <a href="qstring.html#SplitBehavior-enum">SplitBehavior</a> <i>behavior</i> = QString.KeepEmptyParts, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Splits the string into substrings wherever <i>sep</i> occurs,
and returns the list of those strings. If <i>sep</i> does not match
anywhere in the string, split() returns a single-element list
containing this string.</p>
<p><i>cs</i> specifies whether <i>sep</i> should be matched case
sensitively or case insensitively.</p>
<p>If <i>behavior</i> is <a href="qstring.html#SplitBehavior-enum">QString.SkipEmptyParts</a>,
empty entries don't appear in the result. By default, empty entries
are kept.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"a,,b,c"</span>;
<span class="type"><a href="qstringlist.html">QStringList</a></span> list1 <span class="operator">=</span> str<span class="operator">.</span>split(<span class="string">","</span>);
<span class="comment">// list1: [ "a", "", "b", "c" ]</span>
<span class="type"><a href="qstringlist.html">QStringList</a></span> list2 <span class="operator">=</span> str<span class="operator">.</span>split(<span class="string">","</span><span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">.</span>SkipEmptyParts);
<span class="comment">// list2: [ "a", "b", "c" ]</span>
</pre>
<p><b>See also</b> <a href="qstringlist.html#join">QStringList.join</a>() and <a href="qstring.html#section">section</a>().</p>
<h3 class="fn"><a name="split-2" />QStringList QString.split (<i>self</i>, <a href="qregexp.html">QRegExp</a> <i>sep</i>, <a href="qstring.html#SplitBehavior-enum">SplitBehavior</a> <i>behavior</i> = QString.KeepEmptyParts)</h3><p>This is an overloaded function.</p>
<h3 class="fn"><a name="squeeze" />QString.squeeze (<i>self</i>)</h3><p>Releases any memory not required to store the character
data.</p>
<p>The sole purpose of this function is to provide a means of fine
tuning <a href="qstring.html">QString</a>'s memory usage. In
general, you will rarely ever need to call this function.</p>
<p><b>See also</b> <a href="qstring.html#reserve">reserve</a>() and
<a href="qstring.html#capacity">capacity</a>().</p>
<h3 class="fn"><a name="startsWith" />bool QString.startsWith (<i>self</i>, QString <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>Returns true if the string starts with <i>s</i>; otherwise
returns false.</p>
<p>If <i>cs</i> is <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitive</a> (default), the
search is case sensitive; otherwise the search is case
insensitive.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Bananas"</span>;
str<span class="operator">.</span>startsWith(<span class="string">"Ban"</span>); <span class="comment">// returns true</span>
str<span class="operator">.</span>startsWith(<span class="string">"Car"</span>); <span class="comment">// returns false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#endsWith">endsWith</a>().</p>
<h3 class="fn"><a name="startsWith-2" />bool QString.startsWith (<i>self</i>, QStringRef <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><h3 class="fn"><a name="startsWith-3" />bool QString.startsWith (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>, <a href="qt.html#CaseSensitivity-enum">Qt.CaseSensitivity</a> <i>cs</i> = Qt.CaseSensitive)</h3><p>This function overloads <a href="qstring.html#startsWith">startsWith</a>().</p>
<h3 class="fn"><a name="swap" />QString.swap (<i>self</i>, QString <i>other</i>)</h3><p>Swaps string <i>other</i> with this string. This operation is
very fast and never fails.</p>
<p>This function was introduced in Qt 4.8.</p>
<h3 class="fn"><a name="toAscii" /><a href="qbytearray.html">QByteArray</a> QString.toAscii (<i>self</i>)</h3><p>Returns an 8-bit representation of the string as a <a href="qbytearray.html">QByteArray</a>.</p>
<p>If a codec has been set using <a href="qtextcodec.html#setCodecForCStrings">QTextCodec.setCodecForCStrings</a>(),
it is used to convert Unicode to 8-bit char; otherwise this
function does the same as <a href="qstring.html#toLatin1">toLatin1</a>().</p>
<p>Note that, despite the name, this function does not necessarily
return an US-ASCII (ANSI X3.4-1986) string and its result may not
be US-ASCII compatible.</p>
<p><b>See also</b> <a href="qstring.html#fromAscii">fromAscii</a>(), <a href="qstring.html#toLatin1">toLatin1</a>(), <a href="qstring.html#toUtf8">toUtf8</a>(), <a href="qstring.html#toLocal8Bit">toLocal8Bit</a>(), and <a href="qtextcodec.html">QTextCodec</a>.</p>
<h3 class="fn"><a name="toCaseFolded" />QString QString.toCaseFolded (<i>self</i>)</h3><p>Returns the case folded equivalent of the string. For most
Unicode characters this is the same as <a href="qstring.html#toLower">toLower</a>().</p>
<h3 class="fn"><a name="toDouble" />(float, bool <i>ok</i>) QString.toDouble (<i>self</i>)</h3><p>Returns the string converted to a <tt>double</tt> value.</p>
<p>Returns 0.0 if the conversion fails.</p>
<p>If a conversion error occurs, <tt>*</tt><i>ok</i> is set to
false; otherwise <tt>*</tt><i>ok</i> is set to true.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"1234.56"</span>;
<span class="type">double</span> val <span class="operator">=</span> str<span class="operator">.</span>toDouble(); <span class="comment">// val == 1234.56</span>
</pre>
<p>Various string formats for floating point numbers can be
converted to double values:</p>
<pre class="cpp">
<span class="type">bool</span> ok;
<span class="type">double</span> d;
d <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>( <span class="string">"1234.56e-02"</span> )<span class="operator">.</span>toDouble(<span class="operator">&</span>ok); <span class="comment">// ok == true, d == 12.3456</span>
</pre>
<p>This function tries to interpret the string according to the
current locale. The current locale is determined from the system at
application startup and can be changed by calling <a href="qlocale.html#setDefault">QLocale.setDefault</a>(). If the string
cannot be interpreted according to the current locale, this
function falls back on the "C" locale.</p>
<pre class="cpp">
<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>setDefault(<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>C);
d <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>( <span class="string">"1234,56"</span> )<span class="operator">.</span>toDouble(<span class="operator">&</span>ok); <span class="comment">// ok == false</span>
d <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>( <span class="string">"1234.56"</span> )<span class="operator">.</span>toDouble(<span class="operator">&</span>ok); <span class="comment">// ok == true, d == 1234.56</span>
<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>setDefault(<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>German);
d <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>( <span class="string">"1234,56"</span> )<span class="operator">.</span>toDouble(<span class="operator">&</span>ok); <span class="comment">// ok == true, d == 1234.56</span>
d <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>( <span class="string">"1234.56"</span> )<span class="operator">.</span>toDouble(<span class="operator">&</span>ok); <span class="comment">// ok == true, d == 1234.56</span>
</pre>
<p>Due to the ambiguity between the decimal point and thousands
group separator in various locales, this function does not handle
thousands group separators. If you need to convert such numbers,
see <a href="qlocale.html#toDouble">QLocale.toDouble</a>().</p>
<pre class="cpp">
<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>setDefault(<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">.</span>C);
d <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>( <span class="string">"1234,56"</span> )<span class="operator">.</span>toDouble(<span class="operator">&</span>ok); <span class="comment">// ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>(),
<a href="qlocale.html#setDefault">QLocale.setDefault</a>(),
<a href="qlocale.html#toDouble">QLocale.toDouble</a>(), and
<a href="qstring.html#trimmed">trimmed</a>().</p>
<h3 class="fn"><a name="toFloat" />(float, bool <i>ok</i>) QString.toFloat (<i>self</i>)</h3><p>Returns the string converted to a <tt>float</tt> value.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true. Returns 0.0 if the conversion
fails.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str1 <span class="operator">=</span> <span class="string">"1234.56"</span>;
str1<span class="operator">.</span>toFloat(); <span class="comment">// returns 1234.56</span>
<span class="type">bool</span> ok;
<span class="type"><a href="qstring.html">QString</a></span> str2 <span class="operator">=</span> <span class="string">"R2D2"</span>;
str2<span class="operator">.</span>toFloat(<span class="operator">&</span>ok); <span class="comment">// returns 0.0, sets ok to false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>(),
<a href="qstring.html#toDouble">toDouble</a>(), and <a href="qstring.html#toInt">toInt</a>().</p>
<h3 class="fn"><a name="toInt" />(int, bool <i>ok</i>) QString.toInt (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to an <tt>int</tt> using base
<i>base</i>, which is 10 by default and must be between 2 and 36,
or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type">int</span> hex <span class="operator">=</span> str<span class="operator">.</span>toInt(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type">int</span> dec <span class="operator">=</span> str<span class="operator">.</span>toInt(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>(),
<a href="qstring.html#toUInt">toUInt</a>(), and <a href="qstring.html#toDouble">toDouble</a>().</p>
<h3 class="fn"><a name="toLatin1" /><a href="qbytearray.html">QByteArray</a> QString.toLatin1 (<i>self</i>)</h3><p>Returns a Latin-1 representation of the string as a <a href="qbytearray.html">QByteArray</a>.</p>
<p>The returned byte array is undefined if the string contains
non-Latin1 characters. Those characters may be suppressed or
replaced with a question mark.</p>
<p><b>See also</b> <a href="qstring.html#fromLatin1">fromLatin1</a>(), <a href="qstring.html#toAscii">toAscii</a>(), <a href="qstring.html#toUtf8">toUtf8</a>(), <a href="qstring.html#toLocal8Bit">toLocal8Bit</a>(), and <a href="qtextcodec.html">QTextCodec</a>.</p>
<h3 class="fn"><a name="toLocal8Bit" /><a href="qbytearray.html">QByteArray</a> QString.toLocal8Bit (<i>self</i>)</h3><p>Returns the local 8-bit representation of the string as a
<a href="qbytearray.html">QByteArray</a>. The returned byte array
is undefined if the string contains characters not supported by the
local 8-bit encoding.</p>
<p><a href="qtextcodec.html#codecForLocale">QTextCodec.codecForLocale</a>()
is used to perform the conversion from Unicode. If the locale
encoding could not be determined, this function does the same as
<a href="qstring.html#toLatin1">toLatin1</a>().</p>
<p>If this string contains any characters that cannot be encoded in
the locale, the returned byte array is undefined. Those characters
may be suppressed or replaced by another.</p>
<p><b>See also</b> <a href="qstring.html#fromLocal8Bit">fromLocal8Bit</a>(), <a href="qstring.html#toAscii">toAscii</a>(), <a href="qstring.html#toLatin1">toLatin1</a>(), <a href="qstring.html#toUtf8">toUtf8</a>(), and <a href="qtextcodec.html">QTextCodec</a>.</p>
<h3 class="fn"><a name="toLong" />(int, bool <i>ok</i>) QString.toLong (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to a <tt>long</tt> using base
<i>base</i>, which is 10 by default and must be between 2 and 36,
or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type">long</span> hex <span class="operator">=</span> str<span class="operator">.</span>toLong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type">long</span> dec <span class="operator">=</span> str<span class="operator">.</span>toLong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>(),
<a href="qstring.html#toULong">toULong</a>(), and <a href="qstring.html#toInt">toInt</a>().</p>
<h3 class="fn"><a name="toLongLong" />(int, bool <i>ok</i>) QString.toLongLong (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to a <tt>long long</tt> using base
<i>base</i>, which is 10 by default and must be between 2 and 36,
or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type"><a href="qtcore.html#qint64-typedef">long</a></span> hex <span class="operator">=</span> str<span class="operator">.</span>toLongLong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type"><a href="qtcore.html#qint64-typedef">long</a></span> dec <span class="operator">=</span> str<span class="operator">.</span>toLongLong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>(),
<a href="qstring.html#toULongLong">toULongLong</a>(), and <a href="qstring.html#toInt">toInt</a>().</p>
<h3 class="fn"><a name="toLower" />QString QString.toLower (<i>self</i>)</h3><p>Returns a lowercase copy of the string.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Qt by NOKIA"</span>;
str <span class="operator">=</span> str<span class="operator">.</span>toLower(); <span class="comment">// str == "qt by nokia"</span>
</pre>
<p>The case conversion will always happen in the 'C' locale. For
locale dependent case folding use <a href="qlocale.html#toLower">QLocale.toLower</a>()</p>
<p><b>See also</b> <a href="qstring.html#toUpper">toUpper</a>() and
<a href="qlocale.html#toLower">QLocale.toLower</a>().</p>
<h3 class="fn"><a name="toShort" />(int, bool <i>ok</i>) QString.toShort (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to a <tt>short</tt> using base
<i>base</i>, which is 10 by default and must be between 2 and 36,
or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type">short</span> hex <span class="operator">=</span> str<span class="operator">.</span>toShort(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type">short</span> dec <span class="operator">=</span> str<span class="operator">.</span>toShort(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>(),
<a href="qstring.html#toUShort">toUShort</a>(), and <a href="qstring.html#toInt">toInt</a>().</p>
<h3 class="fn"><a name="toUInt" />(int, bool <i>ok</i>) QString.toUInt (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to an <tt>unsigned int</tt> using
base <i>base</i>, which is 10 by default and must be between 2 and
36, or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type"><a href="qtcore.html#uint-typedef">uint</a></span> hex <span class="operator">=</span> str<span class="operator">.</span>toUInt(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type"><a href="qtcore.html#uint-typedef">uint</a></span> dec <span class="operator">=</span> str<span class="operator">.</span>toUInt(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>() and
<a href="qstring.html#toInt">toInt</a>().</p>
<h3 class="fn"><a name="toULong" />(int, bool <i>ok</i>) QString.toULong (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to an <tt>unsigned long</tt> using
base <i>base</i>, which is 10 by default and must be between 2 and
36, or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type"><a href="qtcore.html#ulong-typedef">ulong</a></span> hex <span class="operator">=</span> str<span class="operator">.</span>toULong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type"><a href="qtcore.html#ulong-typedef">ulong</a></span> dec <span class="operator">=</span> str<span class="operator">.</span>toULong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>().</p>
<h3 class="fn"><a name="toULongLong" />(int, bool <i>ok</i>) QString.toULongLong (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to an <tt>unsigned long long</tt>
using base <i>base</i>, which is 10 by default and must be between
2 and 36, or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type"><a href="qtcore.html#quint64-typedef">unsigned long</a></span> hex <span class="operator">=</span> str<span class="operator">.</span>toULongLong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type"><a href="qtcore.html#quint64-typedef">unsigned long</a></span> dec <span class="operator">=</span> str<span class="operator">.</span>toULongLong(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>() and
<a href="qstring.html#toLongLong">toLongLong</a>().</p>
<h3 class="fn"><a name="toUpper" />QString QString.toUpper (<i>self</i>)</h3><p>Returns an uppercase copy of the string.</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"TeXt"</span>;
str <span class="operator">=</span> str<span class="operator">.</span>toUpper(); <span class="comment">// str == "TEXT"</span>
</pre>
<p>The case conversion will always happen in the 'C' locale. For
locale dependent case folding use <a href="qlocale.html#toUpper">QLocale.toUpper</a>()</p>
<p><b>See also</b> <a href="qstring.html#toLower">toLower</a>() and
<a href="qlocale.html#toLower">QLocale.toLower</a>().</p>
<h3 class="fn"><a name="toUShort" />(int, bool <i>ok</i>) QString.toUShort (<i>self</i>, int <i>base</i> = 10)</h3><p>Returns the string converted to an <tt>unsigned short</tt> using
base <i>base</i>, which is 10 by default and must be between 2 and
36, or 0. Returns 0 if the conversion fails.</p>
<p>If a conversion error occurs, *<i>ok</i> is set to false;
otherwise *<i>ok</i> is set to true.</p>
<p>If <i>base</i> is 0, the C language convention is used: If the
string begins with "0x", base 16 is used; if the string begins with
"0", base 8 is used; otherwise, base 10 is used.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"FF"</span>;
<span class="type">bool</span> ok;
<span class="type"><a href="qtcore.html#ushort-typedef">ushort</a></span> hex <span class="operator">=</span> str<span class="operator">.</span>toUShort(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">16</span>); <span class="comment">// hex == 255, ok == true</span>
<span class="type"><a href="qtcore.html#ushort-typedef">ushort</a></span> dec <span class="operator">=</span> str<span class="operator">.</span>toUShort(<span class="operator">&</span>ok<span class="operator">,</span> <span class="number">10</span>); <span class="comment">// dec == 0, ok == false</span>
</pre>
<p><b>See also</b> <a href="qstring.html#number">number</a>() and
<a href="qstring.html#toShort">toShort</a>().</p>
<h3 class="fn"><a name="toUtf8" /><a href="qbytearray.html">QByteArray</a> QString.toUtf8 (<i>self</i>)</h3><p>Returns a UTF-8 representation of the string as a <a href="qbytearray.html">QByteArray</a>.</p>
<p>UTF-8 is a Unicode codec and can represent all characters in a
Unicode string like <a href="qstring.html">QString</a>.</p>
<p>However, in the Unicode range, there are certain codepoints that
are not considered characters. The Unicode standard reserves the
last two codepoints in each Unicode Plane (U+FFFE, U+FFFF, U+1FFFE,
U+1FFFF, U+2FFFE, etc.), as well as 16 codepoints in the range
U+FDD0..U+FDDF, inclusive, as non-characters. If any of those
appear in the string, they may be discarded and will not appear in
the UTF-8 representation, or they may be replaced by one or more
replacement characters.</p>
<p><b>See also</b> <a href="qstring.html#fromUtf8">fromUtf8</a>(),
<a href="qstring.html#toAscii">toAscii</a>(), <a href="qstring.html#toLatin1">toLatin1</a>(), <a href="qstring.html#toLocal8Bit">toLocal8Bit</a>(), and <a href="qtextcodec.html">QTextCodec</a>.</p>
<h3 class="fn"><a name="trimmed" />QString QString.trimmed (<i>self</i>)</h3><p>Returns a string that has whitespace removed from the start and
the end.</p>
<p>Whitespace means any character for which <a href="qchar.html#isSpace">QChar.isSpace</a>() returns true. This
includes the ASCII characters '\t', '\n', '\v', '\f', '\r', and '
'.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">" lots\t of\nwhitespace\r\n "</span>;
str <span class="operator">=</span> str<span class="operator">.</span>trimmed();
<span class="comment">// str == "lots\t of\nwhitespace"</span>
</pre>
<p>Unlike <a href="qstring.html#simplified">simplified</a>(),
trimmed() leaves internal whitespace alone.</p>
<p><b>See also</b> <a href="qstring.html#simplified">simplified</a>().</p>
<h3 class="fn"><a name="truncate" />QString.truncate (<i>self</i>, int <i>pos</i>)</h3><p>Truncates the string at the given <i>position</i> index.</p>
<p>If the specified <i>position</i> index is beyond the end of the
string, nothing happens.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qstring.html">QString</a></span> str <span class="operator">=</span> <span class="string">"Vladivostok"</span>;
str<span class="operator">.</span>truncate(<span class="number">4</span>);
<span class="comment">// str == "Vlad"</span>
</pre>
<p>If <i>position</i> is negative, it is equivalent to passing
zero.</p>
<p><b>See also</b> <a href="qstring.html#chop">chop</a>(), <a href="qstring.html#resize">resize</a>(), and <a href="qstring.html#left">left</a>().</p>
<h3 class="fn"><a name="__add__" />QString QString.__add__ (<i>self</i>, QString <i>s2</i>)</h3><h3 class="fn"><a name="__add__-2" />QString QString.__add__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>ba</i>)</h3><h3 class="fn"><a name="__contains__" />int QString.__contains__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__eq__" />bool QString.__eq__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__eq__-2" />bool QString.__eq__ (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><h3 class="fn"><a name="__eq__-3" />bool QString.__eq__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><h3 class="fn"><a name="__eq__-4" />bool QString.__eq__ (<i>self</i>, QStringRef <i>s2</i>)</h3><h3 class="fn"><a name="__ge__" />bool QString.__ge__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__ge__-2" />bool QString.__ge__ (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><h3 class="fn"><a name="__ge__-3" />bool QString.__ge__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><h3 class="fn"><a name="__getitem__" />QString QString.__getitem__ (<i>self</i>, int <i>i</i>)</h3><h3 class="fn"><a name="__getitem__-2" />QString QString.__getitem__ (<i>self</i>, slice <i>slice</i>)</h3><h3 class="fn"><a name="__gt__" />bool QString.__gt__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__gt__-2" />bool QString.__gt__ (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><h3 class="fn"><a name="__gt__-3" />bool QString.__gt__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><h3 class="fn"><a name="__hash__" />int QString.__hash__ (<i>self</i>)</h3><h3 class="fn"><a name="__iadd__" />QString QString.__iadd__ (<i>self</i>, <a href="qchar.html#SpecialCharacter-enum">QChar.SpecialCharacter</a> <i>c</i>)</h3><h3 class="fn"><a name="__iadd__-2" />QString QString.__iadd__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__iadd__-3" />QString QString.__iadd__ (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><h3 class="fn"><a name="__iadd__-4" />QString QString.__iadd__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><h3 class="fn"><a name="__imul__" />QString QString.__imul__ (<i>self</i>, int <i>m</i>)</h3><h3 class="fn"><a name="__le__" />bool QString.__le__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__le__-2" />bool QString.__le__ (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><h3 class="fn"><a name="__le__-3" />bool QString.__le__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><h3 class="fn"><a name="__len__" /> QString.__len__ (<i>self</i>)</h3><h3 class="fn"><a name="__lt__" />bool QString.__lt__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__lt__-2" />bool QString.__lt__ (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><h3 class="fn"><a name="__lt__-3" />bool QString.__lt__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><h3 class="fn"><a name="__mul__" />QString QString.__mul__ (<i>self</i>, int <i>m</i>)</h3><h3 class="fn"><a name="__ne__" />bool QString.__ne__ (<i>self</i>, QString <i>s</i>)</h3><h3 class="fn"><a name="__ne__-2" />bool QString.__ne__ (<i>self</i>, <a href="qlatin1string.html">QLatin1String</a> <i>s</i>)</h3><h3 class="fn"><a name="__ne__-3" />bool QString.__ne__ (<i>self</i>, <a href="qbytearray.html">QByteArray</a> <i>s</i>)</h3><h3 class="fn"><a name="__ne__-4" />bool QString.__ne__ (<i>self</i>, QStringRef <i>s2</i>)</h3><h3 class="fn"><a name="__repr__" />str QString.__repr__ (<i>self</i>)</h3><h3 class="fn"><a name="__str__" />str QString.__str__ (<i>self</i>)</h3><address><hr /><div align="center"><table border="0" cellspacing="0" width="100%"><tr class="address"><td align="left" width="25%">PyQt 4.11.4 for X11</td><td align="center" width="50%">Copyright © <a href="http://www.riverbankcomputing.com">Riverbank Computing Ltd</a> and <a href="http://www.qt.io">The Qt Company</a> 2015</td><td align="right" width="25%">Qt 4.8.7</td></tr></table></div></address></body></html>
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