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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<h1 align=center>QFile Class Reference</h1><br clear="all">
<p>
The QFile class is an I/O device that operates on files.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qfile-h.html">qfile.h</a>></code>
<p>
Inherits <a href="qiodevice.html">QIODevice</a>.
<p><a href="qfile-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn"><a href="#b097df"><b>QFile</b></a>()</div>
<li><div class="fn"><a href="#9f0c84"><b>QFile</b></a>(constQString&name)</div>
<li><div class="fn"><a href="#17ae38"><b>~QFile</b></a>()</div>
<li><div class="fn">QString<a href="#f6ec78"><b>name</b></a>()const</div>
<li><div class="fn">void<a href="#f0c76b"><b>setName</b></a>(constQString&name)</div>
<li><div class="fn">typedef<b>QCString</b>(*EncoderFn)(constQString&fileName)</div>
<li><div class="fn">typedef<b>QString</b>(*DecoderFn)(constQCString&localfileName)</div>
<li><div class="fn">bool<a href="#900285"><b>exists</b></a>()const</div>
<li><div class="fn">bool<a href="#31dd61"><b>remove</b></a>()</div>
<li><div class="fn">virtualbool<a href="#84dd8e"><b>open</b></a>(int)</div>
<li><div class="fn">bool<a href="#8987f7"><b>open</b></a>(int, FILE*)</div>
<li><div class="fn">bool<a href="#255995"><b>open</b></a>(int, int)</div>
<li><div class="fn">virtualvoid<a href="#64e640"><b>close</b></a>()</div>
<li><div class="fn">virtualvoid<a href="#cb0092"><b>flush</b></a>()</div>
<li><div class="fn">virtualuint<a href="#1e3b5e"><b>size</b></a>()const</div>
<li><div class="fn">virtualint<a href="#8218c0"><b>at</b></a>()const</div>
<li><div class="fn">virtualbool<a href="#858d0b"><b>at</b></a>(int)</div>
<li><div class="fn">virtualbool<a href="#b08f02"><b>atEnd</b></a>()const</div>
<li><div class="fn">virtualint<a href="#8c8ccc"><b>readBlock</b></a>(char*data, uintlen)</div>
<li><div class="fn">virtualint<a href="#0a06c2"><b>readLine</b></a>(char*data, uintmaxlen)</div>
<li><div class="fn">int<a href="#1484a1"><b>readLine</b></a>(QString&, uintmaxlen)</div>
<li><div class="fn">virtualint<a href="#596f05"><b>getch</b></a>()</div>
<li><div class="fn">virtualint<a href="#d70b87"><b>putch</b></a>(int)</div>
<li><div class="fn">virtualint<a href="#471cf3"><b>ungetch</b></a>(int)</div>
<li><div class="fn">int<a href="#f08f8f"><b>handle</b></a>()const</div>
</ul>
<h2>Static Public Members</h2>
<ul>
<li><div class="fn">QCString<a href="#6d63a6"><b>encodeName</b></a>(constQString&fileName)</div>
<li><div class="fn">QString<a href="#21d9d1"><b>decodeName</b></a>(constQCString&localFileName)</div>
<li><div class="fn">void<a href="#a34c1e"><b>setEncodingFunction</b></a>(EncoderFn)</div>
<li><div class="fn">void<a href="#53778b"><b>setDecodingFunction</b></a>(DecoderFn)</div>
<li><div class="fn">bool<a href="#b8dbf0"><b>exists</b></a>(constQString&fileName)</div>
<li><div class="fn">bool<a href="#56e980"><b>remove</b></a>(constQString&fileName)</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QFile class is an I/O device that operates on files.
<p>
QFile is an I/O device for reading and writing binary and text files. A
QFile may be used by itself (readBlock and writeBlock) or by more
conveniently using <a href="qdatastream.html">QDataStream</a> or <a href="qtextstream.html">QTextStream</a>.
<p>Here is a code fragment that uses QTextStream to read a text
file line by line. It prints each line with a line number.
<pre> <a href="qfile.html">QFile</a> f("file.txt");
if ( f.<a href="#255995">open</a>(IO_ReadOnly) ) { // file opened successfully
<a href="qtextstream.html">QTextStream</a> t( &f ); // use a text stream
<a href="qstring.html">QString</a> s;
int n = 1;
while ( !t.<a href="qtextstream.html#bb145b">eof</a>() ) { // until end of file...
s = t.<a href="qtextstream.html#ae4af4">readLine</a>(); // line of text excluding '\n'
printf( "%3d: %s\n", n++, (const char *)s );
}
f.<a href="#64e640">close</a>();
}
</pre>
<p>The <a href="qfileinfo.html">QFileInfo</a> class holds detailed information about a file, such as
access permissions, file dates and file types.
<p>The <a href="qdir.html">QDir</a> class manages directories and lists of file names.
<p>See also <a href="qdatastream.html">QDataStream</a> and <a href="qtextstream.html">QTextStream</a>.
<p>Examples:
<a href="xml-tagreader-tagreader-cpp.html#QFile">xml/tagreader/tagreader.cpp</a>
<a href="xml-tagreader-with-features-tagreader-cpp.html#QFile">xml/tagreader-with-features/tagreader.cpp</a>
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="b097df"></a>QFile::QFile()</h3>
<p>Constructs a QFile with no name.
<h3 class="fn"><a name="9f0c84"></a>QFile::QFile(const<a href="qstring.html">QString</a>&name)</h3>
<p>Constructs a QFile with a file name <em>name.</em>
<p>See also <a href="#f0c76b">setName</a>().
<h3 class="fn"><a name="17ae38"></a>QFile::~QFile()</h3>
<p>Destructs a QFile. Calls <a href="#64e640">close</a>().
<h3 class="fn">bool<a name="858d0b"></a>QFile::at(intpos) <code>[virtual]</code></h3>
<p>Sets the file index to <em>pos.</em> Returns TRUE if successful, otherwise FALSE.
<p>Example:
<pre> <a href="qfile.html">QFile</a> f( "data.bin" );
f.<a href="#255995">open</a>( IO_ReadOnly ); // index set to 0
f.<a href="#8218c0">at</a>( 100 ); // set index to 100
f.<a href="#8218c0">at</a>( f.<a href="#8218c0">at</a>()+50 ); // set index to 150
f.<a href="#8218c0">at</a>( f.<a href="#1e3b5e">size</a>()-80 ); // set index to 80 before EOF
f.<a href="#64e640">close</a>();
</pre>
<p><b>Warning:</b> The result is undefined if the file was <a href="#255995">opened</a>
using the <code>IO_Append</code> specifier.
<p>See also <a href="#1e3b5e">size</a>() and <a href="#255995">open</a>().
<p>Reimplemented from <a href="qiodevice.html#90fb01">QIODevice.</a>
<h3 class="fn">int<a name="8218c0"></a>QFile::at()const <code>[virtual]</code></h3>
<p>Returns the file index.
<p>See also <a href="#1e3b5e">size</a>().
<p>Reimplemented from <a href="qiodevice.html#a8b90e">QIODevice.</a>
<h3 class="fn">bool<a name="b08f02"></a>QFile::atEnd()const <code>[virtual]</code></h3>
<p>Returns TRUE if the end of file has been reached, otherwise FALSE.
<p>See also <a href="#1e3b5e">size</a>().
<p>Reimplemented from <a href="qiodevice.html#d51a01">QIODevice.</a>
<h3 class="fn">void<a name="64e640"></a>QFile::close() <code>[virtual]</code></h3>
<p>Closes an open file.
<p>The file is not closed if it was opened with an existing file handle.
If the existing file handle is a <code>FILE*,</code> the file is flushed.
If the existing file handle is an <code>int</code> file descriptor, nothing
is done to the file.
<p>Some "write-behind" filesystems may report an unspecified error on
closing the file. These errors only indicate that something may
have gone wrong since the previous <a href="#255995">open</a>(). In such a case <a href="qiodevice.html#494f6f">status</a>()
reports IO_UnspecifiedError after close(), otherwise IO_Ok.
<p>See also <a href="#255995">open</a>() and <a href="#cb0092">flush</a>().
<p>Reimplemented from <a href="qiodevice.html#50fcfd">QIODevice.</a>
<h3 class="fn"><a href="qstring.html">QString</a><a name="21d9d1"></a>QFile::decodeName(const<a href="qcstring.html">QCString</a>&localFileName) <code>[static]</code></h3>
<p>This does the reverse of <a href="#6d63a6">QFile::encodeName</a>().
<p>See also <a href="#53778b">setDecodingFunction</a>().
<h3 class="fn"><a href="qcstring.html">QCString</a><a name="6d63a6"></a>QFile::encodeName(const<a href="qstring.html">QString</a>&fileName) <code>[static]</code></h3>
<p>When you use QFile, <a href="qfileinfo.html">QFileInfo</a>, and <a href="qdir.html">QDir</a> to access the filesystem
with Qt, you can use Unicode filenames. On Unix, these filenames
are converted to an 8-bit encoding. If you want to do your own
file I/O on Unix, you should convert the filename using this
function. On Windows NT, Unicode filenames are supported directly
in the filesystem and this function should be avoided. On Windows 95,
non-Latin1 locales are not supported at this time.
<p>By default, this function converts to the local 8-bit encoding
determined by the user's locale. This is sufficient for
filenames that the user chooses. Filenames hard-coded into the
application should only use 7-bit ASCII filename characters.
<p>The conversion scheme can be changed using <a href="#a34c1e">setEncodingFunction</a>().
This might be useful if you wish to give the user an option to
store in filenames in UTF-8, etc., but beware that such filenames
would probably then be unrecognizable when seen by other programs.
<p>See also <a href="#21d9d1">decodeName</a>().
<h3 class="fn">bool<a name="900285"></a>QFile::exists()const</h3>
<p>Returns TRUE if this file exists, otherwise FALSE.
<p>See also <a href="#f6ec78">name</a>().
<h3 class="fn">bool<a name="b8dbf0"></a>QFile::exists(const<a href="qstring.html">QString</a>&fileName) <code>[static]</code></h3>
<p>Returns TRUE if the file given by <em>fileName</em> exists, otherwise FALSE.
<h3 class="fn">void<a name="cb0092"></a>QFile::flush() <code>[virtual]</code></h3>
<p>Flushes the file buffer to the disk.
<p><a href="#64e640">close</a>() also flushes the file buffer.
<p>Reimplemented from <a href="qiodevice.html#dfd9f0">QIODevice.</a>
<h3 class="fn">int<a name="596f05"></a>QFile::getch() <code>[virtual]</code></h3>
<p>Reads a single byte/character from the file.
<p>Returns the byte/character read, or -1 if the end of the file has been
reached.
<p>See also <a href="#d70b87">putch</a>() and <a href="#471cf3">ungetch</a>().
<p>Reimplemented from <a href="qiodevice.html#09409b">QIODevice.</a>
<h3 class="fn">int<a name="f08f8f"></a>QFile::handle()const</h3>
<p>Returns the file handle of the file.
<p>This is a small positive integer, suitable for use with C library
functions such as fdopen() and fcntl(), as well as with <a href="qsocketnotifier.html">QSocketNotifier</a>.
<p>If the file is not open or there is an error, handle() returns -1.
<p>See also <a href="qsocketnotifier.html">QSocketNotifier</a>.
<h3 class="fn"><a href="qstring.html">QString</a><a name="f6ec78"></a>QFile::name()const</h3>
<p>Returns the name set by <a href="#f0c76b">setName</a>().
<p>See also <a href="#f0c76b">setName</a>() and <a href="qfileinfo.html#a9e3d2">QFileInfo::fileName</a>().
<h3 class="fn">bool<a name="84dd8e"></a>QFile::open(intm) <code>[virtual]</code></h3>
<p>Opens the file specified by the file name currently set, using the mode <em>m.</em>
Returns TRUE if successful, otherwise FALSE.
<p>The mode parameter <em>m</em> must be a combination of the following flags:
<ul>
<li><code>IO_Raw</code> specified raw (non-buffered) file access.
<li><code>IO_ReadOnly</code> opens the file in read-only mode.
<li><code>IO_WriteOnly</code> opens the file in write-only mode (and truncates).
<li><code>IO_ReadWrite</code> opens the file in read/write mode, equivalent to
<code>(IO_ReadOnly|IO_WriteOnly).</code>
<li><code>IO_Append</code> opens the file in append mode. This mode is very useful
when you want to write something to a log file. The file index is set to
the end of the file. Note that the result is undefined if you position the
file index manually using <a href="#8218c0">at</a>() in append mode.
<li><code>IO_Truncate</code> truncates the file.
<li><code>IO_Translate</code> enables carriage returns and linefeed translation
for text files under MS-DOS, Windows and OS/2.
</ul>
<p>The raw access mode is best when I/O is block-operated using 4kB block size
or greater. Buffered access works better when reading small portions of
data at a time.
<p><strong>Important:</strong> When working with buffered files, data may
not be written to the file at once. Call <a href="#cb0092">flush</a>
to make sure the data is really written.<p><b>Warning:</b> We have experienced problems with some C libraries when a buffered
file is opened for both reading and writing. If a read operation takes place
immediately after a write operation, the read buffer contains garbage data.
Worse, the same garbage is written to the file. Calling <a href="#cb0092">flush</a>() before
<a href="#8c8ccc">readBlock</a>() solved this problem.
<p>If the file does not exist and <code>IO_WriteOnly</code> or <code>IO_ReadWrite</code> is
specified, it is created.
<p>Example:
<pre> <a href="qfile.html">QFile</a> f1( "/tmp/data.bin" );
<a href="qfile.html">QFile</a> f2( "readme.txt" );
f1.<a href="#255995">open</a>( IO_Raw | IO_ReadWrite | IO_Append );
f2.<a href="#255995">open</a>( IO_ReadOnly | IO_Translate );
</pre>
<p>See also <a href="#f6ec78">name</a>(), <a href="#64e640">close</a>(), <a href="qiodevice.html#1bc7b0">isOpen</a>() and <a href="#cb0092">flush</a>().
<p>Reimplemented from <a href="qiodevice.html#756b18">QIODevice.</a>
<h3 class="fn">bool<a name="8987f7"></a>QFile::open(intm, FILE*f)</h3>
<p>Opens a file in the mode <em>m</em> using an existing file handle <em>f.</em>
Returns TRUE if successful, otherwise FALSE.
<p>Example:
<pre> #include <stdio.h>
void printError( const char* msg )
{
<a href="qfile.html">QFile</a> f;
f.<a href="#255995">open</a>( IO_WriteOnly, stderr );
f.<a href="#a44b6a">writeBlock</a>( msg, qstrlen(msg) ); // write to stderr
f.<a href="#64e640">close</a>();
}
</pre>
<p>When a QFile is opened using this function, <a href="#64e640">close</a>() does not actually
close the file, only flushes it.<p><b>Warning:</b> If <em>f</em> is <code>stdin, stdout, stderr,</code> you may not
be able to seek. See <a href="qiodevice.html#d264a5">QIODevice::isSequentialAccess</a>() for more
information.
<p>See also <a href="#64e640">close</a>().
<h3 class="fn">bool<a name="255995"></a>QFile::open(intm, intf)</h3>
<p>Opens a file in the mode <em>m</em> using an existing file descriptor <em>f.</em>
Returns TRUE if successful, otherwise FALSE.
<p>When a QFile is opened using this function, <a href="#64e640">close</a>() does not actually
close the file.<p><b>Warning:</b> If <em>f</em> is one of 0 (stdin), 1 (stdout) or 2 (stderr), you may not
be able to seek. <a href="#1e3b5e">size</a>() is set to <code>INT_MAX</code> (in limits.h).
<p>See also <a href="#64e640">close</a>().
<h3 class="fn">int<a name="d70b87"></a>QFile::putch(intch) <code>[virtual]</code></h3>
<p>Writes the character <em>ch</em> to the file.
<p>Returns <em>ch,</em> or -1 if some error occurred.
<p>See also <a href="#596f05">getch</a>() and <a href="#471cf3">ungetch</a>().
<p>Reimplemented from <a href="qiodevice.html#71cd12">QIODevice.</a>
<h3 class="fn">int<a name="8c8ccc"></a>QFile::readBlock(char*p, uintlen) <code>[virtual]</code></h3>
<p>Reads at most <em>len</em> bytes from the file into <em>p</em> and returns the
number of bytes actually read.
<p>Returns -1 if a serious error occurred.<p><b>Warning:</b> We have experienced problems with some C libraries when a buffered
file is opened for both reading and writing. If a read operation takes place
immediately after a write operation, the read buffer contains garbage data.
Worse, the same garbage is written to the file. Calling <a href="#cb0092">flush</a>() before
readBlock() solved this problem.
<p>See also <a href="#a44b6a">writeBlock</a>().
<p>Reimplemented from <a href="qiodevice.html#c12e6e">QIODevice.</a>
<h3 class="fn">int<a name="1484a1"></a>QFile::readLine(<a href="qstring.html">QString</a>&s, uintmaxlen)</h3>
<p>Reads a line of text.
<p>Reads bytes from the file until end-of-line is reached, or up to <em>maxlen</em> bytes, and returns the number of bytes read, or -1 in case of
error. The terminating newline is not stripped.
<p>This function is efficient only for buffered files. Avoid
<a href="#0a06c2">readLine</a>() for files that have been opened with the <code>IO_Raw</code>
flag.
<p>Note that the string is read as plain Latin1 bytes, not Unicode.
<p>See also <a href="#8c8ccc">readBlock</a>() and <a href="qtextstream.html#ae4af4">QTextStream::readLine</a>().
<h3 class="fn">int<a name="0a06c2"></a>QFile::readLine(char*p, uintmaxlen) <code>[virtual]</code></h3>
<p>Reads a line of text.
<p>Reads bytes from the file until end-of-line is reached, or up to <em>maxlen</em> bytes, and returns the number of bytes read, or -1 in case of
error. The terminating newline is not stripped.
<p>This function is efficient only for buffered files. Avoid
readLine() for files that have been opened with the <code>IO_Raw</code>
flag.
<p>See also <a href="#8c8ccc">readBlock</a>() and <a href="qtextstream.html#ae4af4">QTextStream::readLine</a>().
<p>Reimplemented from <a href="qiodevice.html#0b6051">QIODevice.</a>
<h3 class="fn">bool<a name="31dd61"></a>QFile::remove()</h3>
<p>Removes the file specified by the file name currently set.
Returns TRUE if successful, otherwise FALSE.
<p>The file is closed before it is removed.
<h3 class="fn">bool<a name="56e980"></a>QFile::remove(const<a href="qstring.html">QString</a>&fileName) <code>[static]</code></h3>
<p>Removes the file <em>fileName.</em>
Returns TRUE if successful, otherwise FALSE.
<h3 class="fn">void<a name="53778b"></a>QFile::setDecodingFunction(<a href="qfile.html#DecoderFn">DecoderFn</a>f) <code>[static]</code></h3>
<p>Sets the function for decoding 8-bit filenames.
The default uses the locale-specific 8-bit encoding.
<p>See also <a href="#6d63a6">encodeName</a>() and <a href="#21d9d1">decodeName</a>().
<h3 class="fn">void<a name="a34c1e"></a>QFile::setEncodingFunction(<a href="qfile.html#EncoderFn">EncoderFn</a>f) <code>[static]</code></h3>
<p>Sets the function for encoding Unicode filenames.
The default encodes in the locale-specific 8-bit encoding.
<p>See also <a href="#6d63a6">encodeName</a>().
<h3 class="fn">void<a name="f0c76b"></a>QFile::setName(const<a href="qstring.html">QString</a>&name)</h3>
<p>Sets the name of the file. The name can include an absolute directory
path or it can be a name or a path relative to the current directory.
<p>Do not call this function if the file has already been opened.
<p>Note that if the name is relative QFile does not associate it with the
current directory. If you change directory before calling <a href="#255995">open</a>(), open
uses the new current directory.
<p>Example:
<pre> <a href="qfile.html">QFile</a> f;
<a href="qdir.html#5faf24">QDir::setCurrent</a>( "/tmp" );
f.<a href="#f0c76b">setName</a>( "readme.txt" );
<a href="qdir.html#5faf24">QDir::setCurrent</a>( "/home" );
f.<a href="#255995">open</a>( IO_ReadOnly ); // opens "/home/readme.txt" under UNIX
</pre>
<p>Also note that the directory separator '/' works for all operating
systems supported by Qt.
<p>See also <a href="#f6ec78">name</a>(), <a href="qfileinfo.html">QFileInfo</a> and <a href="qdir.html">QDir</a>.
<h3 class="fn">uint<a name="1e3b5e"></a>QFile::size()const <code>[virtual]</code></h3>
<p>Returns the file size.
<p>See also <a href="#8218c0">at</a>().
<p>Reimplemented from <a href="qiodevice.html#8ddedd">QIODevice.</a>
<h3 class="fn">int<a name="471cf3"></a>QFile::ungetch(intch) <code>[virtual]</code></h3>
<p>Puts the character <em>ch</em> back into the file and decrements the index if it
is not zero.
<p>This function is normally called to "undo" a <a href="#596f05">getch</a>() operation.
<p>Returns <em>ch,</em> or -1 if some error occurred.
<p>See also <a href="#596f05">getch</a>() and <a href="#d70b87">putch</a>().
<p>Reimplemented from <a href="qiodevice.html#05a43c">QIODevice.</a>
<h3 class="fn">int<a name="ac9325"></a>QFile::writeBlock(const<a href="qbytearray.html">QByteArray</a>&data)</h3>
<p>Reimplemented for internal reasons; the API is not affected.
<h3 class="fn">int<a name="a44b6a"></a>QFile::writeBlock(constchar*p, uintlen) <code>[virtual]</code></h3>
<p>Reimplemented for internal reasons; the API is not affected.
<p>Writes <em>len</em> bytes from <em>p</em> to the file and returns the number of
bytes actually written.
<p>Returns -1 if a serious error occurred.<p><b>Warning:</b> When working with buffered files, data may not be written
to the file at once. Call <a href="#cb0092">flush</a>() to make sure the data is really
written.
<p>See also <a href="#8c8ccc">readBlock</a>().
<p>Reimplemented from <a href="qiodevice.html#924d2f">QIODevice.</a>
<hr><p>
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