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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>QDataStream Class Reference</h1><br clear="all">
<p>
The QDataStream class provides serialization of binary data to a <a href="qiodevice.html">QIODevice</a>.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qdatastream-h.html">qdatastream.h</a>></code>
<p><a href="qdatastream-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn"><a href="#3e51d7"><b>QDataStream</b></a>()</div>
<li><div class="fn"><a href="#899857"><b>QDataStream</b></a>(QIODevice*)</div>
<li><div class="fn"><a href="#754295"><b>QDataStream</b></a>(QByteArray, intmode)</div>
<li><div class="fn">virtual<a href="#f8ae75"><b>~QDataStream</b></a>()</div>
<li><div class="fn">QIODevice*<a href="#acadc3"><b>device</b></a>()const</div>
<li><div class="fn">void<a href="#1a7b5d"><b>setDevice</b></a>(QIODevice*)</div>
<li><div class="fn">void<a href="#e3b840"><b>unsetDevice</b></a>()</div>
<li><div class="fn">bool<a href="#f6c878"><b>atEnd</b></a>()const</div>
<li><div class="fn">booleof()const<em>(obsolete)</em></div>
<li><div class="fn">enum<b>ByteOrder</b>{BigEndian, LittleEndian}</div>
<li><div class="fn">int<a href="#cf34b4"><b>byteOrder</b></a>()const</div>
<li><div class="fn">void<a href="#ab87e8"><b>setByteOrder</b></a>(int)</div>
<li><div class="fn">bool<a href="#0ffafc"><b>isPrintableData</b></a>()const</div>
<li><div class="fn">void<a href="#0f254b"><b>setPrintableData</b></a>(bool)</div>
<li><div class="fn">int<a href="#048d53"><b>version</b></a>()const</div>
<li><div class="fn">void<a href="#364c56"><b>setVersion</b></a>(int)</div>
<li><div class="fn">QDataStream&<a href="#6902cc"><b>operator>></b></a>(Q_INT8&i)</div>
<li><div class="fn">QDataStream&<a href="#83954f"><b>operator>></b></a>(Q_UINT8&i)</div>
<li><div class="fn">QDataStream&<a href="#01bfcb"><b>operator>></b></a>(Q_INT16&i)</div>
<li><div class="fn">QDataStream&<a href="#38cfd4"><b>operator>></b></a>(Q_UINT16&i)</div>
<li><div class="fn">QDataStream&<a href="#a47f7a"><b>operator>></b></a>(Q_INT32&i)</div>
<li><div class="fn">QDataStream&<a href="#216a2b"><b>operator>></b></a>(Q_UINT32&i)</div>
<li><div class="fn">QDataStream&<a href="#044601"><b>operator>></b></a>(Q_INT64&i)</div>
<li><div class="fn">QDataStream&<a href="#879484"><b>operator>></b></a>(Q_UINT64&i)</div>
<li><div class="fn">QDataStream&<a href="#70bdec"><b>operator>></b></a>(float&f)</div>
<li><div class="fn">QDataStream&<a href="#c29148"><b>operator>></b></a>(double&f)</div>
<li><div class="fn">QDataStream&<a href="#20f7c7"><b>operator>></b></a>(char*&str)</div>
<li><div class="fn">QDataStream&<a href="#0413e6"><b>operator<<</b></a>(Q_INT8i)</div>
<li><div class="fn">QDataStream&<a href="#7c0419"><b>operator<<</b></a>(Q_UINT8i)</div>
<li><div class="fn">QDataStream&<a href="#10f8fd"><b>operator<<</b></a>(Q_INT16i)</div>
<li><div class="fn">QDataStream&<a href="#53f1f8"><b>operator<<</b></a>(Q_UINT16i)</div>
<li><div class="fn">QDataStream&<a href="#04cfe7"><b>operator<<</b></a>(Q_INT32i)</div>
<li><div class="fn">QDataStream&<a href="#fc6d8c"><b>operator<<</b></a>(Q_UINT32i)</div>
<li><div class="fn">QDataStream&<a href="#c2f339"><b>operator<<</b></a>(Q_INT64i)</div>
<li><div class="fn">QDataStream&<a href="#107886"><b>operator<<</b></a>(Q_UINT64i)</div>
<li><div class="fn">QDataStream&<a href="#85f9ba"><b>operator<<</b></a>(floatf)</div>
<li><div class="fn">QDataStream&<a href="#57a13f"><b>operator<<</b></a>(doublef)</div>
<li><div class="fn">QDataStream&<a href="#22b9b4"><b>operator<<</b></a>(constchar*str)</div>
<li><div class="fn">QDataStream&<a href="#eb3437"><b>readBytes</b></a>(char*&, uint&len)</div>
<li><div class="fn">QDataStream&<a href="#ce9f80"><b>readRawBytes</b></a>(char*, uintlen)</div>
<li><div class="fn">QDataStream&<a href="#f713e7"><b>writeBytes</b></a>(constchar*, uintlen)</div>
<li><div class="fn">QDataStream&<a href="#cf90f0"><b>writeRawBytes</b></a>(constchar*, uintlen)</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QDataStream class provides serialization of binary data to a <a href="qiodevice.html">QIODevice</a>.
<p>
A data stream is a binary stream of encoded information which is 100%
independent of the host computer operation system, CPU or byte order. A
stream that is written by a PC under DOS/Windows can be read by a
Sun SPARC running Solaris.
<p>The QDataStream class implements serialization of primitive types, like
<code>char, short, int, char*</code> etc. Serialization of more complex
data is accomplished by breaking up the data into primitive units.
<p>The programmer can select which byte order to use when serializing data.
The default setting is big endian (MSB first). Changing it to little
endian breaks the portability (unless the reader also changes to little
endian). We recommend keeping this setting unless you have
special requirements.
<p>A data stream cooperates closely with a QIODevice. A QIODevice
represents an input/output medium one can read data from and write data
to. The <a href="qfile.html">QFile</a> class is an example of an IO device.
<p>Example (write data to a stream):
<pre> <a href="qfile.html">QFile</a> f( "file.dta" );
f.<a href="qfile.html#255995">open</a>( IO_WriteOnly ); // open file for writing
<a href="qdatastream.html">QDataStream</a> s( &f ); // serialize using f
s << "the answer is"; // serialize string
s << (Q_INT32)42; // serialize integer
</pre>
<p>Example (read data from a stream):
<pre> <a href="qfile.html">QFile</a> f( "file.dta" );
f.<a href="qfile.html#255995">open</a>( IO_ReadOnly ); // open file for reading
<a href="qdatastream.html">QDataStream</a> s( &f ); // serialize using f
char *str;
Q_INT32 a;
s >> str >> a; // "the answer is" and 42
delete str; // delete string
</pre>
<p>In the last example, if you read into a <a href="qstring.html">QString</a> instead of a <code>char*</code>
you do not have to delete it.
<p>Normally, each item written to the stream is written in a fixed binary
format.
For example, a <code>char*</code> is written as a 32-bit integer equal to the
length of the string including the NUL byte, followed by all the
characters of the string including the NUL byte. Similarly when
reading a string, 4 bytes are read to create the 32-bit length value,
then that many characters for the string including the NUL. For a complete
description of all Qt types supporting data streaming see <a href="datastreamformat.html">Format of the QDataStream operators</a> .
<p>If you want a "parsing" input stream, see <a href="qtextstream.html">QTextStream</a>. If you just want the
data to be human-readable to aid in debugging, you can set the data
stream into printable data mode with <a href="#0f254b">setPrintableData</a>(). The data is
then written slower, in a human readable bloated form that is sufficient
for debugging.
<p>If you are producing a new binary data format, such as a file format
for documents created by your application, you could use a QDataStream
to write the data in a portable format. Typically, you would write
a brief header containing a magic string and a version number to give
yourself room for future expansion. For example:
<p><pre> // Open the file.
<a href="qfile.html">QFile</a> f( "file.xxx" );
f.<a href="qfile.html#255995">open</a>( IO_WriteOnly );
<a href="qdatastream.html">QDataStream</a> s( &f );
// Write a header with a "magic number" and a version
s << 0xa0b0c0d0;
s << 123;
// Write the data
s << [lots of interesting data]
</pre>
<p>Then read it in with:
<p><pre> // Open the file.
<a href="qfile.html">QFile</a> f( "file.xxx" );
f.<a href="qfile.html#255995">open</a>( IO_ReadOnly );
<a href="qdatastream.html">QDataStream</a> s( &f );
// Read and check the header
Q_UINT32 magic;
s >> magic;
if ( magic != 0xa0b0c0d0 )
return XXX_BAD_FILE_FORMAT;
// Read the version
Q_INT32 version;
s >> version;
if ( version < 100 )
return XXX_BAD_FILE_TOO_OLD;
if ( version > 123 )
return XXX_BAD_FILE_TOO_NEW;
if ( version <= 110 )
s.<a href="#364c56">setVersion</a>(1);
// Read the data
s >> [lots of interesting data];
if ( version > 120 )
s >> [data new in XXX version 1.2];
s >> [other interesting data];
</pre>
<p>See also <a href="qtextstream.html">QTextStream</a> and <a href="qvariant.html">QVariant</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="3e51d7"></a>QDataStream::QDataStream()</h3>
<p>Constructs a data stream that has no IO device.
<p>See also <a href="#1a7b5d">setDevice</a>().
<h3 class="fn"><a name="754295"></a>QDataStream::QDataStream(<a href="qbytearray.html">QByteArray</a>a, intmode)</h3>
<p>Constructs a data stream that operates on a byte array through an
internal <a href="qbuffer.html">QBuffer</a> device.
<p>Example:
<pre> static char bindata[] = { 231, 1, 44, ... };
<a href="qbytearray.html">QByteArray</a> a;
a.<a href="qbytearray.html#69921b">setRawData</a>( bindata, sizeof(bindata) ); // a points to bindata
<a href="qdatastream.html">QDataStream</a> s( a, IO_ReadOnly ); // open on a's data
s >> [something]; // read raw bindata
a.<a href="qbytearray.html#756c99">resetRawData</a>( bindata, sizeof(bindata) ); // finished
</pre>
<p>The <a href="qarray.html#77c9a0">QArray::setRawData</a>() function is not for the inexperienced.
<h3 class="fn"><a name="899857"></a>QDataStream::QDataStream(<a href="qiodevice.html">QIODevice</a>*d)</h3>
<p>Constructs a data stream that uses the IO device <em>d.</em>
<p>See also <a href="#1a7b5d">setDevice</a>() and <a href="#acadc3">device</a>().
<h3 class="fn"><a name="f8ae75"></a>QDataStream::~QDataStream() <code>[virtual]</code></h3>
<p>Destructs the data stream.
<p>The destructor will not affect the current IO device, unless it
is an internal IO device processing a <a href="qbytearray.html">QByteArray</a> passed in the constructor.
<h3 class="fn">bool<a name="f6c878"></a>QDataStream::atEnd()const</h3>
<p>Returns TRUE if the IO device has reached the end position (end of
stream or file) or if there is no IO device set.
<p>Returns FALSE if the current position of the read/write head of the IO
device is somewhere before the end position.
<p>See also <a href="qiodevice.html#d51a01">QIODevice::atEnd</a>().
<h3 class="fn">int<a name="cf34b4"></a>QDataStream::byteOrder()const</h3>
<p>Returns the current byte order setting - either <code>BigEndian</code> or
<code>LittleEndian.</code>
<p>See also <a href="#ab87e8">setByteOrder</a>().
<h3 class="fn"><a href="qiodevice.html">QIODevice</a>*<a name="acadc3"></a>QDataStream::device()const</h3>
<p>Returns the IO device currently set.
<p>See also <a href="#1a7b5d">setDevice</a>() and <a href="#e3b840">unsetDevice</a>().
<h3 class="fn">bool<a name="48bf3b"></a>QDataStream::eof()const</h3>
<p><b>This function is obsolete.</b> It is provided to keep old source working, and will probably be removed in a future version of Qt. We strongly advise against using it in new code.<p>
<p>Returns TRUE if the IO device has reached the end position (end of
stream or file) or if there is no IO device set.
<p>Returns FALSE if the current position of the read/write head of the IO
device is somewhere before the end position.
<p>See also <a href="qiodevice.html#d51a01">QIODevice::atEnd</a>().
<h3 class="fn">bool<a name="0ffafc"></a>QDataStream::isPrintableData()const</h3>
<p>Returns TRUE if the printable data flag has been set.
<p>See also <a href="#0f254b">setPrintableData</a>().
<h3 class="fn">QDataStream&<a name="10f8fd"></a>QDataStream::operator<<(Q_INT16i)</h3>
<p>Writes a signed 16-bit integer to the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="04cfe7"></a>QDataStream::operator<<(Q_INT32i)</h3>
<p>Writes a signed 32-bit integer to the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="c2f339"></a>QDataStream::operator<<(Q_INT64i)</h3>
<p>Writes a signed 64-bit integer to the stream and returns a reference to
the stream, or calls the Q_INT32-operator if 64 bit is not available.
<h3 class="fn">QDataStream&<a name="0413e6"></a>QDataStream::operator<<(Q_INT8i)</h3>
<p>Writes a signed byte to the stream.
<h3 class="fn">QDataStream&<a name="53f1f8"></a>QDataStream::operator<<(Q_UINT16i)</h3>
<p>Writes an unsigned 16-bit integer to the stream and returns a reference
to the stream.
<h3 class="fn">QDataStream&<a name="fc6d8c"></a>QDataStream::operator<<(Q_UINT32i)</h3>
<p>Writes an unsigned 32-bit integer to the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="107886"></a>QDataStream::operator<<(Q_UINT64i)</h3>
<p>Writes an unsigned 64-bit integer to the stream and returns a reference to
the stream, or uses the Q_UINT32-operator if 64 bit is not available.
<h3 class="fn">QDataStream&<a name="7c0419"></a>QDataStream::operator<<(Q_UINT8i)</h3>
<p>Writes an unsigned byte to the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="22b9b4"></a>QDataStream::operator<<(constchar*s)</h3>
<p>Writes the '\0'-terminated string <em>s</em> to the stream and returns
a reference to the stream.
<p>The string is serialized using <a href="#f713e7">writeBytes</a>().
<h3 class="fn">QDataStream&<a name="57a13f"></a>QDataStream::operator<<(doublef)</h3>
<p>Writes a 64-bit floating point number to the stream using the standard
IEEE754 format. Returns a reference to the stream.
<h3 class="fn">QDataStream&<a name="85f9ba"></a>QDataStream::operator<<(floatf)</h3>
<p>Writes a 32-bit floating point number to the stream using the standard
IEEE754 format. Returns a reference to the stream.
<h3 class="fn">QDataStream&<a name="01bfcb"></a>QDataStream::operator>>(Q_INT16&i)</h3>
<p>Reads a signed 16-bit integer from the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="a47f7a"></a>QDataStream::operator>>(Q_INT32&i)</h3>
<p>Reads a signed 32-bit integer from the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="044601"></a>QDataStream::operator>>(Q_INT64&i)</h3>
<p>Reads a signed 64-bit integer from the stream and returns a reference to
the stream, or uses the Q_UINT32 operator if 64 bit is not available.
<h3 class="fn">QDataStream&<a name="6902cc"></a>QDataStream::operator>>(Q_INT8&i)</h3>
<p>Reads a signed byte from the stream.
<h3 class="fn">QDataStream&<a name="38cfd4"></a>QDataStream::operator>>(Q_UINT16&i)</h3>
<p>Reads an unsigned 16-bit integer from the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="216a2b"></a>QDataStream::operator>>(Q_UINT32&i)</h3>
<p>Reads an unsigned 32-bit integer from the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="879484"></a>QDataStream::operator>>(Q_UINT64&i)</h3>
<p>Reads an unsigned 64-bit integer from the stream and returns a reference to
the stream, or uses the Q_UINT32 operator if 64 bit is not available.
<h3 class="fn">QDataStream&<a name="83954f"></a>QDataStream::operator>>(Q_UINT8&i)</h3>
<p>Reads an unsigned byte from the stream and returns a reference to
the stream.
<h3 class="fn">QDataStream&<a name="20f7c7"></a>QDataStream::operator>>(char*&s)</h3>
<p>Reads the '\0'-terminated string <em>s</em> from the stream and returns
a reference to the stream.
<p>Space for the string is allocated using <code>new</code> - the caller must
eventually call delete[] on the value.
<h3 class="fn">QDataStream&<a name="c29148"></a>QDataStream::operator>>(double&f)</h3>
<p>Reads a 64-bit floating point number from the stream using the standard
IEEE754 format. Returns a reference to the stream.
<h3 class="fn">QDataStream&<a name="70bdec"></a>QDataStream::operator>>(float&f)</h3>
<p>Reads a 32-bit floating point number from the stream using the standard
IEEE754 format. Returns a reference to the stream.
<h3 class="fn">QDataStream&<a name="eb3437"></a>QDataStream::readBytes(char*&s, uint&l)</h3>
<p>Reads the buffer <em>s</em> from the stream and returns a reference to the
stream.
<p>The buffer <em>s</em> is allocated using <code>new.</code> Destroy it with the <code>delete[]</code>
operator. If the length is zero or <em>s</em> cannot be allocated, <em>s</em> is
set to 0.
<p>The <em>l</em> parameter will be set to the length of the buffer.
<p>The serialization format is an Q_UINT32 length specifier first, then the
data (<em>l</em> bytes).
<p>See also <a href="#ce9f80">readRawBytes</a>() and <a href="#f713e7">writeBytes</a>().
<h3 class="fn">QDataStream&<a name="ce9f80"></a>QDataStream::readRawBytes(char*s, uintlen)</h3>
<p>Reads <em>len</em> bytes from the stream into <em>s</em> and returns a reference to
the stream.
<p>The buffer <em>s</em> must be preallocated.
<p>See also <a href="#eb3437">readBytes</a>(), <a href="qiodevice.html#c12e6e">QIODevice::readBlock</a>() and <a href="#cf90f0">writeRawBytes</a>().
<h3 class="fn">void<a name="ab87e8"></a>QDataStream::setByteOrder(intbo)</h3>
<p>Sets the serialization byte order to <em>bo.</em>
<p>The <em>bo</em> parameter can be <code>QDataStream::BigEndian</code> or
<code>QDataStream::LittleEndian.</code>
<p>The default setting is big endian. We recommend leaving this setting unless
you have special requirements.
<p>See also <a href="#cf34b4">byteOrder</a>().
<h3 class="fn">void<a name="1a7b5d"></a>QDataStream::setDevice(<a href="qiodevice.html">QIODevice</a>*d)</h3>
<p>void QDataStream::setDevice(<a href="qiodevice.html">QIODevice</a> *d )
Sets the IO device to <em>d.</em>
<p>See also <a href="#acadc3">device</a>() and <a href="#e3b840">unsetDevice</a>().
<h3 class="fn">void<a name="0f254b"></a>QDataStream::setPrintableData(boolenable)</h3>
<p>Sets or clears the printable data flag.
<p>If this flag is set, the write functions will generate output that
consists of printable characters (7 bit ASCII).
<p>We recommend enabling printable data only for debugging purposes
(it is slower and creates larger output).
<h3 class="fn">void<a name="364c56"></a>QDataStream::setVersion(intv)</h3>
<p>Sets the version number of the data serialization format.
<p>In order to accomodate for new functionality, the datastream
serialization format of some Qt classes has changed in some versions of
Qt. If you want to read data that was created by an earlier version of
Qt, or write data that can be read by a program that was compiled with
an earlier version of Qt, use this function to modify the serialization
format of QDataStream.
<p>For Qt 1.x compatibility, use <em>v</em> == 1.
<p>For Qt 2.0.x compatibility, use <em>v</em> == 2 (Not required for reading in
Qt 2.1).
<p>See also <a href="#048d53">version</a>().
<h3 class="fn">void<a name="e3b840"></a>QDataStream::unsetDevice()</h3>
<p>Unsets the IO device. This is the same as calling <a href="#1a7b5d">setDevice</a>( 0 ).
<p>See also <a href="#acadc3">device</a>() and <a href="#1a7b5d">setDevice</a>().
<h3 class="fn">int<a name="048d53"></a>QDataStream::version()const</h3>
<p>Returns the version number of the data serialization format.
In Qt 2.1, this number is by default 3.
<p>See also <a href="#364c56">setVersion</a>().
<h3 class="fn">QDataStream&<a name="f713e7"></a>QDataStream::writeBytes(constchar*s, uintlen)</h3>
<p>Writes the length specifier <em>len</em> and the buffer <em>s</em> to the stream and
returns a reference to the stream.
<p>The <em>len</em> is serialized as an Q_UINT32, followed by <em>len</em> bytes from
<em>s.</em>
<p>See also <a href="#cf90f0">writeRawBytes</a>() and <a href="#eb3437">readBytes</a>().
<h3 class="fn">QDataStream&<a name="cf90f0"></a>QDataStream::writeRawBytes(constchar*s, uintlen)</h3>
<p>Writes <em>len</em> bytes from <em>s</em> to the stream and returns a reference to the
stream.
<p>See also <a href="#f713e7">writeBytes</a>(), <a href="qiodevice.html#924d2f">QIODevice::writeBlock</a>() and <a href="#ce9f80">readRawBytes</a>().
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