<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qbuffer.cpp --> <title>QBuffer Class | Qt Core 5.11</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td ><a href="../qtdoc/index.html">Qt 5.11</a></td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QBuffer</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.11.2 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#public-functions">Public Functions</a></li> <li class="level1"><a href="#reimplemented-public-functions">Reimplemented Public Functions</a></li> <li class="level1"><a href="#reimplemented-protected-functions">Reimplemented Protected Functions</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">QBuffer Class</h1> <!-- $$$QBuffer-brief --> <p>The <a href="qbuffer.html">QBuffer</a> class provides a <a href="qiodevice.html">QIODevice</a> interface for a <a href="qbytearray.html">QByteArray</a>. <a href="#details">More...</a></p> <!-- @@@QBuffer --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QBuffer></span> </td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qiodevice.html">QIODevice</a></td></tr></table></div><ul> <li><a href="qbuffer-members.html">List of all members, including inherited members</a></li> </ul> <p><b>Note:</b> All functions in this class are <a href="../qtdoc/threads-reentrancy.html">reentrant</a>.</p> <a name="public-functions"></a> <h2 id="public-functions">Public Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#QBuffer">QBuffer</a></b>(QObject *<i>parent</i> = nullptr)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#QBuffer-1">QBuffer</a></b>(QByteArray *<i>byteArray</i>, QObject *<i>parent</i> = nullptr)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#dtor.QBuffer">~QBuffer</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QByteArray &</td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#buffer">buffer</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> const QByteArray &</td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#buffer-1">buffer</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> const QByteArray &</td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#data">data</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#setBuffer">setBuffer</a></b>(QByteArray *<i>byteArray</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#setData">setData</a></b>(const QByteArray &<i>data</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#setData-1">setData</a></b>(const char *<i>data</i>, int <i>size</i>)</td></tr> </table></div> <a name="reimplemented-public-functions"></a> <h2 id="reimplemented-public-functions">Reimplemented Public Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#atEnd">atEnd</a></b>() const override</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#canReadLine">canReadLine</a></b>() const override</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#close">close</a></b>() override</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#open">open</a></b>(QIODevice::OpenMode <i>flags</i>) override</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual qint64 </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#pos">pos</a></b>() const override</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#seek">seek</a></b>(qint64 <i>pos</i>) override</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual qint64 </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#size">size</a></b>() const override</td></tr> </table></div> <ul> <li class="fn">44 public functions inherited from <a href="qiodevice.html#public-functions">QIODevice</a></li> <li class="fn">32 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li> </ul> <a name="reimplemented-protected-functions"></a> <h2 id="reimplemented-protected-functions">Reimplemented Protected Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual qint64 </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#readData">readData</a></b>(char *<i>data</i>, qint64 <i>len</i>) override</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual qint64 </td><td class="memItemRight bottomAlign"><b><a href="qbuffer.html#writeData">writeData</a></b>(const char *<i>data</i>, qint64 <i>len</i>) override</td></tr> </table></div> <ul> <li class="fn">5 protected functions inherited from <a href="qiodevice.html#protected-functions">QIODevice</a></li> <li class="fn">9 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li> </ul> <h3>Additional Inherited Members</h3> <ul> <li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li> <li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li> <li class="fn">6 signals inherited from <a href="qiodevice.html#signals">QIODevice</a></li> <li class="fn">2 signals inherited from <a href="qobject.html#signals">QObject</a></li> <li class="fn">11 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li> <li class="fn">5 protected functions inherited from <a href="qiodevice.html#protected-functions">QIODevice</a></li> <li class="fn">9 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li> </ul> <a name="details"></a> <!-- $$$QBuffer-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>The <a href="qbuffer.html">QBuffer</a> class provides a <a href="qiodevice.html">QIODevice</a> interface for a <a href="qbytearray.html">QByteArray</a>.</p> <p><a href="qbuffer.html">QBuffer</a> allows you to access a <a href="qbytearray.html">QByteArray</a> using the <a href="qiodevice.html">QIODevice</a> interface. The <a href="qbytearray.html">QByteArray</a> is treated just as a standard random-accessed file. Example:</p> <pre class="cpp"> <span class="type"><a href="qbuffer.html#QBuffer">QBuffer</a></span> buffer; <span class="type">char</span> ch; buffer<span class="operator">.</span>open(<span class="type"><a href="qbuffer.html#QBuffer">QBuffer</a></span><span class="operator">::</span>ReadWrite); buffer<span class="operator">.</span>write(<span class="string">"Qt rocks!"</span>); buffer<span class="operator">.</span>seek(<span class="number">0</span>); buffer<span class="operator">.</span>getChar(<span class="operator">&</span>ch); <span class="comment">// ch == 'Q'</span> buffer<span class="operator">.</span>getChar(<span class="operator">&</span>ch); <span class="comment">// ch == 't'</span> buffer<span class="operator">.</span>getChar(<span class="operator">&</span>ch); <span class="comment">// ch == ' '</span> buffer<span class="operator">.</span>getChar(<span class="operator">&</span>ch); <span class="comment">// ch == 'r'</span> </pre> <p>By default, an internal <a href="qbytearray.html">QByteArray</a> buffer is created for you when you create a <a href="qbuffer.html">QBuffer</a>. You can access this buffer directly by calling <a href="qbuffer.html#buffer">buffer</a>(). You can also use <a href="qbuffer.html">QBuffer</a> with an existing <a href="qbytearray.html">QByteArray</a> by calling <a href="qbuffer.html#setBuffer">setBuffer</a>(), or by passing your array to <a href="qbuffer.html">QBuffer</a>'s constructor.</p> <p>Call <a href="qbuffer.html#open">open</a>() to open the buffer. Then call <a href="qiodevice.html#write">write</a>() or <a href="qiodevice.html#putChar">putChar</a>() to write to the buffer, and <a href="qiodevice.html#read">read</a>(), <a href="qiodevice.html#readLine">readLine</a>(), <a href="qiodevice.html#readAll">readAll</a>(), or <a href="qiodevice.html#getChar">getChar</a>() to read from it. <a href="qbuffer.html#size">size</a>() returns the current size of the buffer, and you can seek to arbitrary positions in the buffer by calling <a href="qbuffer.html#seek">seek</a>(). When you are done with accessing the buffer, call <a href="qbuffer.html#close">close</a>().</p> <p>The following code snippet shows how to write data to a <a href="qbytearray.html">QByteArray</a> using <a href="qdatastream.html">QDataStream</a> and <a href="qbuffer.html">QBuffer</a>:</p> <pre class="cpp"> <span class="type"><a href="qbytearray.html">QByteArray</a></span> byteArray; <span class="type"><a href="qbuffer.html#QBuffer">QBuffer</a></span> buffer(<span class="operator">&</span>byteArray); buffer<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html#QIODevice">QIODevice</a></span><span class="operator">::</span>WriteOnly); <span class="type"><a href="qdatastream.html">QDataStream</a></span> out(<span class="operator">&</span>buffer); out <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span><span class="operator">::</span>palette(); </pre> <p>Effectively, we convert the application's <a href="../qtgui/qpalette.html">QPalette</a> into a byte array. Here's how to read the data from the <a href="qbytearray.html">QByteArray</a>:</p> <pre class="cpp"> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span> palette; <span class="type"><a href="qbuffer.html#QBuffer">QBuffer</a></span> buffer(<span class="operator">&</span>byteArray); buffer<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html#QIODevice">QIODevice</a></span><span class="operator">::</span>ReadOnly); <span class="type"><a href="qdatastream.html">QDataStream</a></span> in(<span class="operator">&</span>buffer); in <span class="operator">></span><span class="operator">></span> palette; </pre> <p><a href="qtextstream.html">QTextStream</a> and <a href="qdatastream.html">QDataStream</a> also provide convenience constructors that take a <a href="qbytearray.html">QByteArray</a> and that create a <a href="qbuffer.html">QBuffer</a> behind the scenes.</p> <p><a href="qbuffer.html">QBuffer</a> emits <a href="qiodevice.html#readyRead">readyRead</a>() when new data has arrived in the buffer. By connecting to this signal, you can use <a href="qbuffer.html">QBuffer</a> to store temporary data before processing it. <a href="qbuffer.html">QBuffer</a> also emits <a href="qiodevice.html#bytesWritten">bytesWritten</a>() every time new data has been written to the buffer.</p> </div> <p><b>See also </b><a href="qfile.html">QFile</a>, <a href="qdatastream.html">QDataStream</a>, <a href="qtextstream.html">QTextStream</a>, and <a href="qbytearray.html">QByteArray</a>.</p> <!-- @@@QBuffer --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QBuffer[overload1]$$$QBufferQObject* --> <h3 class="fn" id="QBuffer"><a name="QBuffer"></a>QBuffer::<span class="name">QBuffer</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3> <p>Constructs an empty buffer with the given <i>parent</i>. You can call <a href="qbuffer.html#setData">setData</a>() to fill the buffer with data, or you can open it in write mode and use <a href="qiodevice.html#write">write</a>().</p> <p><b>See also </b><a href="qbuffer.html#open">open</a>().</p> <!-- @@@QBuffer --> <!-- $$$QBuffer$$$QBufferQByteArray*QObject* --> <h3 class="fn" id="QBuffer-1"><a name="QBuffer-1"></a>QBuffer::<span class="name">QBuffer</span>(<span class="type"><a href="qbytearray.html">QByteArray</a></span> *<i>byteArray</i>, <span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3> <p>Constructs a <a href="qbuffer.html">QBuffer</a> that uses the <a href="qbytearray.html">QByteArray</a> pointed to by <i>byteArray</i> as its internal buffer, and with the given <i>parent</i>. The caller is responsible for ensuring that <i>byteArray</i> remains valid until the <a href="qbuffer.html">QBuffer</a> is destroyed, or until <a href="qbuffer.html#setBuffer">setBuffer</a>() is called to change the buffer. <a href="qbuffer.html">QBuffer</a> doesn't take ownership of the <a href="qbytearray.html">QByteArray</a>.</p> <p>If you open the buffer in write-only mode or read-write mode and write something into the <a href="qbuffer.html">QBuffer</a>, <i>byteArray</i> will be modified.</p> <p>Example:</p> <pre class="cpp"> <span class="type"><a href="qbytearray.html">QByteArray</a></span> byteArray(<span class="string">"abc"</span>); <span class="type"><a href="qbuffer.html#QBuffer">QBuffer</a></span> buffer(<span class="operator">&</span>byteArray); buffer<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html#QIODevice">QIODevice</a></span><span class="operator">::</span>WriteOnly); buffer<span class="operator">.</span>seek(<span class="number">3</span>); buffer<span class="operator">.</span>write(<span class="string">"def"</span><span class="operator">,</span> <span class="number">3</span>); buffer<span class="operator">.</span>close(); <span class="comment">// byteArray == "abcdef"</span> </pre> <p><b>See also </b><a href="qbuffer.html#open">open</a>(), <a href="qbuffer.html#setBuffer">setBuffer</a>(), and <a href="qbuffer.html#setData">setData</a>().</p> <!-- @@@QBuffer --> <!-- $$$~QBuffer[overload1]$$$~QBuffer --> <h3 class="fn" id="dtor.QBuffer"><a name="dtor.QBuffer"></a><code>[virtual] </code>QBuffer::<span class="name">~QBuffer</span>()</h3> <p>Destroys the buffer.</p> <!-- @@@~QBuffer --> <!-- $$$atEnd[overload1]$$$atEnd --> <h3 class="fn" id="atEnd"><a name="atEnd"></a><code>[override virtual] </code><span class="type">bool</span> QBuffer::<span class="name">atEnd</span>() const</h3> <p>Reimplemented from <a href="qiodevice.html#atEnd">QIODevice::atEnd</a>().</p> <!-- @@@atEnd --> <!-- $$$buffer[overload1]$$$buffer --> <h3 class="fn" id="buffer"><a name="buffer"></a><span class="type"><a href="qbytearray.html">QByteArray</a></span> &QBuffer::<span class="name">buffer</span>()</h3> <p>Returns a reference to the <a href="qbuffer.html">QBuffer</a>'s internal buffer. You can use it to modify the <a href="qbytearray.html">QByteArray</a> behind the <a href="qbuffer.html">QBuffer</a>'s back.</p> <p><b>See also </b><a href="qbuffer.html#setBuffer">setBuffer</a>() and <a href="qbuffer.html#data">data</a>().</p> <!-- @@@buffer --> <!-- $$$buffer$$$buffer --> <h3 class="fn" id="buffer-1"><a name="buffer-1"></a>const <span class="type"><a href="qbytearray.html">QByteArray</a></span> &QBuffer::<span class="name">buffer</span>() const</h3> <p>This is an overloaded function.</p> <p>This is the same as <a href="qbuffer.html#data">data</a>().</p> <!-- @@@buffer --> <!-- $$$canReadLine[overload1]$$$canReadLine --> <h3 class="fn" id="canReadLine"><a name="canReadLine"></a><code>[override virtual] </code><span class="type">bool</span> QBuffer::<span class="name">canReadLine</span>() const</h3> <p>Reimplemented from <a href="qiodevice.html#canReadLine">QIODevice::canReadLine</a>().</p> <!-- @@@canReadLine --> <!-- $$$close[overload1]$$$close --> <h3 class="fn" id="close"><a name="close"></a><code>[override virtual] </code><span class="type">void</span> QBuffer::<span class="name">close</span>()</h3> <p>Reimplemented from <a href="qiodevice.html#close">QIODevice::close</a>().</p> <!-- @@@close --> <!-- $$$data[overload1]$$$data --> <h3 class="fn" id="data"><a name="data"></a>const <span class="type"><a href="qbytearray.html">QByteArray</a></span> &QBuffer::<span class="name">data</span>() const</h3> <p>Returns the data contained in the buffer.</p> <p>This is the same as <a href="qbuffer.html#buffer">buffer</a>().</p> <p><b>See also </b><a href="qbuffer.html#setData">setData</a>() and <a href="qbuffer.html#setBuffer">setBuffer</a>().</p> <!-- @@@data --> <!-- $$$open[overload1]$$$openQIODevice::OpenMode --> <h3 class="fn" id="open"><a name="open"></a><code>[override virtual] </code><span class="type">bool</span> QBuffer::<span class="name">open</span>(<span class="type"><a href="qiodevice.html#OpenModeFlag-enum">QIODevice::OpenMode</a></span> <i>flags</i>)</h3> <p>Reimplemented from <a href="qiodevice.html#open">QIODevice::open</a>().</p> <!-- @@@open --> <!-- $$$pos[overload1]$$$pos --> <h3 class="fn" id="pos"><a name="pos"></a><code>[override virtual] </code><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> QBuffer::<span class="name">pos</span>() const</h3> <p>Reimplemented from <a href="qiodevice.html#pos">QIODevice::pos</a>().</p> <!-- @@@pos --> <!-- $$$readData[overload1]$$$readDatachar*qint64 --> <h3 class="fn" id="readData"><a name="readData"></a><code>[override virtual protected] </code><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> QBuffer::<span class="name">readData</span>(<span class="type">char</span> *<i>data</i>, <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> <i>len</i>)</h3> <p>Reimplemented from <a href="qiodevice.html#readData">QIODevice::readData</a>().</p> <!-- @@@readData --> <!-- $$$seek[overload1]$$$seekqint64 --> <h3 class="fn" id="seek"><a name="seek"></a><code>[override virtual] </code><span class="type">bool</span> QBuffer::<span class="name">seek</span>(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> <i>pos</i>)</h3> <p>Reimplemented from <a href="qiodevice.html#seek">QIODevice::seek</a>().</p> <!-- @@@seek --> <!-- $$$setBuffer[overload1]$$$setBufferQByteArray* --> <h3 class="fn" id="setBuffer"><a name="setBuffer"></a><span class="type">void</span> QBuffer::<span class="name">setBuffer</span>(<span class="type"><a href="qbytearray.html">QByteArray</a></span> *<i>byteArray</i>)</h3> <p>Makes <a href="qbuffer.html">QBuffer</a> uses the <a href="qbytearray.html">QByteArray</a> pointed to by <i>byteArray</i> as its internal buffer. The caller is responsible for ensuring that <i>byteArray</i> remains valid until the <a href="qbuffer.html">QBuffer</a> is destroyed, or until setBuffer() is called to change the buffer. <a href="qbuffer.html">QBuffer</a> doesn't take ownership of the <a href="qbytearray.html">QByteArray</a>.</p> <p>Does nothing if <a href="qiodevice.html#isOpen">isOpen</a>() is true.</p> <p>If you open the buffer in write-only mode or read-write mode and write something into the <a href="qbuffer.html">QBuffer</a>, <i>byteArray</i> will be modified.</p> <p>Example:</p> <pre class="cpp"> <span class="type"><a href="qbytearray.html">QByteArray</a></span> byteArray(<span class="string">"abc"</span>); <span class="type"><a href="qbuffer.html#QBuffer">QBuffer</a></span> buffer; buffer<span class="operator">.</span>setBuffer(<span class="operator">&</span>byteArray); buffer<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html#QIODevice">QIODevice</a></span><span class="operator">::</span>WriteOnly); buffer<span class="operator">.</span>seek(<span class="number">3</span>); buffer<span class="operator">.</span>write(<span class="string">"def"</span><span class="operator">,</span> <span class="number">3</span>); buffer<span class="operator">.</span>close(); <span class="comment">// byteArray == "abcdef"</span> </pre> <p>If <i>byteArray</i> is 0, the buffer creates its own internal <a href="qbytearray.html">QByteArray</a> to work on. This byte array is initially empty.</p> <p><b>See also </b><a href="qbuffer.html#buffer">buffer</a>(), <a href="qbuffer.html#setData">setData</a>(), and <a href="qbuffer.html#open">open</a>().</p> <!-- @@@setBuffer --> <!-- $$$setData[overload1]$$$setDataconstQByteArray& --> <h3 class="fn" id="setData"><a name="setData"></a><span class="type">void</span> QBuffer::<span class="name">setData</span>(const <span class="type"><a href="qbytearray.html">QByteArray</a></span> &<i>data</i>)</h3> <p>Sets the contents of the internal buffer to be <i>data</i>. This is the same as assigning <i>data</i> to <a href="qbuffer.html#buffer">buffer</a>().</p> <p>Does nothing if <a href="qiodevice.html#isOpen">isOpen</a>() is true.</p> <p><b>See also </b><a href="qbuffer.html#data">data</a>() and <a href="qbuffer.html#setBuffer">setBuffer</a>().</p> <!-- @@@setData --> <!-- $$$setData$$$setDataconstchar*int --> <h3 class="fn" id="setData-1"><a name="setData-1"></a><span class="type">void</span> QBuffer::<span class="name">setData</span>(const <span class="type">char</span> *<i>data</i>, <span class="type">int</span> <i>size</i>)</h3> <p>This is an overloaded function.</p> <p>Sets the contents of the internal buffer to be the first <i>size</i> bytes of <i>data</i>.</p> <!-- @@@setData --> <!-- $$$size[overload1]$$$size --> <h3 class="fn" id="size"><a name="size"></a><code>[override virtual] </code><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> QBuffer::<span class="name">size</span>() const</h3> <p>Reimplemented from <a href="qiodevice.html#size">QIODevice::size</a>().</p> <!-- @@@size --> <!-- $$$writeData[overload1]$$$writeDataconstchar*qint64 --> <h3 class="fn" id="writeData"><a name="writeData"></a><code>[override virtual protected] </code><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> QBuffer::<span class="name">writeData</span>(const <span class="type">char</span> *<i>data</i>, <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> <i>len</i>)</h3> <p>Reimplemented from <a href="qiodevice.html#writeData">QIODevice::writeData</a>().</p> <!-- @@@writeData --> </div> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2018 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>