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Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtcore.html">QtCore</a></li> <li>QDebug</li> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <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="#details">Detailed Description</a></li> <li class="level2"><a href="#basic-use">Basic Use</a></li> <li class="level2"><a href="#writing-custom-types-to-a-stream">Writing Custom Types to a Stream</a></li> </ul> </div> <h1 class="title">QDebug Class Reference</h1> <!-- $$$QDebug-brief --> <p>The QDebug class provides an output stream for debugging information. <a href="#details">More...</a></p> <!-- @@@QDebug --> <pre class="cpp"> <span class="preprocessor">#include <QDebug></span></pre><ul> <li><a href="qdebug-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2>Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebugx">QDebug</a></b> ( QIODevice * <i>device</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebug-2">QDebug</a></b> ( QString * <i>string</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebug-3">QDebug</a></b> ( QtMsgType <i>type</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebug-4">QDebug</a></b> ( const QDebug & <i>other</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#dtor.QDebug">~QDebug</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#maybeSpace">maybeSpace</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#nospace">nospace</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#space">space</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt">operator<<</a></b> ( QChar <i>t</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-3">operator<<</a></b> ( bool <i>t</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-4">operator<<</a></b> ( char <i>t</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-5">operator<<</a></b> ( signed short <i>i</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-6">operator<<</a></b> ( unsigned short <i>i</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-7">operator<<</a></b> ( signed int <i>i</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-8">operator<<</a></b> ( unsigned int <i>i</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-9">operator<<</a></b> ( signed long <i>l</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-10">operator<<</a></b> ( unsigned long <i>l</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-11">operator<<</a></b> ( qint64 <i>i</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-12">operator<<</a></b> ( quint64 <i>i</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-13">operator<<</a></b> ( float <i>f</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-14">operator<<</a></b> ( double <i>f</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-15">operator<<</a></b> ( const char * <i>s</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-16">operator<<</a></b> ( const QString & <i>s</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-17">operator<<</a></b> ( const QStringRef & <i>s</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-18">operator<<</a></b> ( const QLatin1String & <i>s</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-19">operator<<</a></b> ( const QByteArray & <i>b</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-20">operator<<</a></b> ( const void * <i>p</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-eq">operator=</a></b> ( const QDebug & <i>other</i> )</td></tr> </table> <a name="details"></a> <!-- $$$QDebug-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QDebug class provides an output stream for debugging information.</p> <p>QDebug is used whenever the developer needs to write out debugging or tracing information to a device, file, string or console.</p> <a name="basic-use"></a> <h3>Basic Use</h3> <p>In the common case, it is useful to call the <a href="qtglobal.html#qDebug">qDebug</a>() function to obtain a default QDebug object to use for writing debugging information.</p> <pre class="cpp"> <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Date:"</span> <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qdate.html">QDate</a></span><span class="operator">::</span>currentDate(); <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Types:"</span> <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"String"</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'x'</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">40</span>); <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Custom coordinate type:"</span> <span class="operator"><</span><span class="operator"><</span> coordinate;</pre> <p>This constructs a QDebug object using the constructor that accepts a <a href="qtglobal.html#QtMsgType-enum">QtMsgType</a> value of <a href="qtglobal.html#QtMsgType-enum">QtDebugMsg</a>. Similarly, the <a href="qtglobal.html#qWarning">qWarning</a>(), <a href="qtglobal.html#qCritical">qCritical</a>() and <a href="qtglobal.html#qFatal">qFatal</a>() functions also return QDebug objects for the corresponding message types.</p> <p>The class also provides several constructors for other situations, including a constructor that accepts a <a href="qfile.html">QFile</a> or any other <a href="qiodevice.html">QIODevice</a> subclass that is used to write debugging information to files and other devices. The constructor that accepts a <a href="qstring.html">QString</a> is used to write to a string for display or serialization.</p> <a name="writing-custom-types-to-a-stream"></a> <h3>Writing Custom Types to a Stream</h3> <p>Many standard types can be written to QDebug objects, and Qt provides support for most Qt value types. To add support for custom types, you need to implement a streaming operator, as in the following example:</p> <pre class="cpp"> <span class="type">QDebug</span> <span class="keyword">operator</span><span class="operator"><</span><span class="operator"><</span>(<span class="type">QDebug</span> dbg<span class="operator">,</span> <span class="keyword">const</span> Coordinate <span class="operator">&</span>c) { dbg<span class="operator">.</span>nospace() <span class="operator"><</span><span class="operator"><</span> <span class="string">"("</span> <span class="operator"><</span><span class="operator"><</span> c<span class="operator">.</span>x() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> c<span class="operator">.</span>y() <span class="operator"><</span><span class="operator"><</span> <span class="string">")"</span>; <span class="keyword">return</span> dbg<span class="operator">.</span>space(); }</pre> <p>This is described in the <a href="debug.html">Debugging Techniques</a> and <a href="custom-types.html#making-the-type-printable">Creating Custom Qt Types</a> documents.</p> </div> <!-- @@@QDebug --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QDebug[overload1]$$$QDebugQIODevice* --> <h3 class="fn"><a name="QDebugx"></a>QDebug::<span class="name">QDebug</span> ( <span class="type"><a href="qiodevice.html">QIODevice</a></span> * <i>device</i> )</h3> <p>Constructs a debug stream that writes to the given <i>device</i>.</p> <!-- @@@QDebug --> <!-- $$$QDebug$$$QDebugQString* --> <h3 class="fn"><a name="QDebug-2"></a>QDebug::<span class="name">QDebug</span> ( <span class="type"><a href="qstring.html">QString</a></span> * <i>string</i> )</h3> <p>Constructs a debug stream that writes to the given <i>string</i>.</p> <!-- @@@QDebug --> <!-- $$$QDebug$$$QDebugQtMsgType --> <h3 class="fn"><a name="QDebug-3"></a>QDebug::<span class="name">QDebug</span> ( <span class="type"><a href="qtglobal.html#QtMsgType-enum">QtMsgType</a></span> <i>type</i> )</h3> <p>Constructs a debug stream that writes to the handler for the message type specified by <i>type</i>.</p> <!-- @@@QDebug --> <!-- $$$QDebug$$$QDebugconstQDebug& --> <h3 class="fn"><a name="QDebug-4"></a>QDebug::<span class="name">QDebug</span> ( const <span class="type">QDebug</span> & <i>other</i> )</h3> <p>Constructs a copy of the <i>other</i> debug stream.</p> <!-- @@@QDebug --> <!-- $$$~QDebug[overload1]$$$~QDebug --> <h3 class="fn"><a name="dtor.QDebug"></a>QDebug::<span class="name">~QDebug</span> ()</h3> <p>Flushes any pending data to be written and destroys the debug stream.</p> <!-- @@@~QDebug --> <!-- $$$maybeSpace[overload1]$$$maybeSpace --> <h3 class="fn"><a name="maybeSpace"></a><span class="type">QDebug</span> & QDebug::<span class="name">maybeSpace</span> ()</h3> <p>Writes a space character to the debug stream, depending on the last character sent to the stream, and returns a reference to the stream.</p> <p>If the last character was a space character, this function writes a space character to the stream; otherwise, no characters are written to the stream.</p> <p><b>See also </b><a href="qdebug.html#space">space</a>() and <a href="qdebug.html#nospace">nospace</a>().</p> <!-- @@@maybeSpace --> <!-- $$$nospace[overload1]$$$nospace --> <h3 class="fn"><a name="nospace"></a><span class="type">QDebug</span> & QDebug::<span class="name">nospace</span> ()</h3> <p>Clears the stream's internal flag that records whether the last character was a space and returns a reference to the stream.</p> <p><b>See also </b><a href="qdebug.html#space">space</a>() and <a href="qdebug.html#maybeSpace">maybeSpace</a>().</p> <!-- @@@nospace --> <!-- $$$space[overload1]$$$space --> <h3 class="fn"><a name="space"></a><span class="type">QDebug</span> & QDebug::<span class="name">space</span> ()</h3> <p>Writes a space character to the debug stream and returns a reference to the stream.</p> <p>The stream will record that the last character sent to the stream was a space.</p> <p><b>See also </b><a href="qdebug.html#nospace">nospace</a>() and <a href="qdebug.html#maybeSpace">maybeSpace</a>().</p> <!-- @@@space --> <!-- $$$operator<<[overload1]$$$operator<<QChar --> <h3 class="fn"><a name="operator-lt-lt"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type"><a href="qchar.html">QChar</a></span> <i>t</i> )</h3> <p>Writes the character, <i>t</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<bool --> <h3 class="fn"><a name="operator-lt-lt-3"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">bool</span> <i>t</i> )</h3> <p>Writes the boolean value, <i>t</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<char --> <h3 class="fn"><a name="operator-lt-lt-4"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">char</span> <i>t</i> )</h3> <p>Writes the character, <i>t</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<signedshort --> <h3 class="fn"><a name="operator-lt-lt-5"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">signed</span> <span class="type">short</span> <i>i</i> )</h3> <p>Writes the signed short integer, <i>i</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<unsignedshort --> <h3 class="fn"><a name="operator-lt-lt-6"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">unsigned</span> <span class="type">short</span> <i>i</i> )</h3> <p>Writes then unsigned short integer, <i>i</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<signedint --> <h3 class="fn"><a name="operator-lt-lt-7"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">signed</span> <span class="type">int</span> <i>i</i> )</h3> <p>Writes the signed integer, <i>i</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<unsignedint --> <h3 class="fn"><a name="operator-lt-lt-8"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">unsigned</span> <span class="type">int</span> <i>i</i> )</h3> <p>Writes then unsigned integer, <i>i</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<signedlong --> <h3 class="fn"><a name="operator-lt-lt-9"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">signed</span> <span class="type">long</span> <i>l</i> )</h3> <p>Writes the signed long integer, <i>l</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<unsignedlong --> <h3 class="fn"><a name="operator-lt-lt-10"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">unsigned</span> <span class="type">long</span> <i>l</i> )</h3> <p>Writes then unsigned long integer, <i>l</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<qint64 --> <h3 class="fn"><a name="operator-lt-lt-11"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> <i>i</i> )</h3> <p>Writes the signed 64-bit integer, <i>i</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<quint64 --> <h3 class="fn"><a name="operator-lt-lt-12"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type"><a href="qtglobal.html#quint64-typedef">quint64</a></span> <i>i</i> )</h3> <p>Writes then unsigned 64-bit integer, <i>i</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<float --> <h3 class="fn"><a name="operator-lt-lt-13"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">float</span> <i>f</i> )</h3> <p>Writes the 32-bit floating point number, <i>f</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<double --> <h3 class="fn"><a name="operator-lt-lt-14"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">double</span> <i>f</i> )</h3> <p>Writes the 64-bit floating point number, <i>f</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<constchar* --> <h3 class="fn"><a name="operator-lt-lt-15"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type">char</span> * <i>s</i> )</h3> <p>Writes the '\0'-terminated string, <i>s</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<constQString& --> <h3 class="fn"><a name="operator-lt-lt-16"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>s</i> )</h3> <p>Writes the string, <i>s</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<constQStringRef& --> <h3 class="fn"><a name="operator-lt-lt-17"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qstringref.html">QStringRef</a></span> & <i>s</i> )</h3> <p>Writes the string reference, <i>s</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<constQLatin1String& --> <h3 class="fn"><a name="operator-lt-lt-18"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qlatin1string.html">QLatin1String</a></span> & <i>s</i> )</h3> <p>Writes the Latin1-encoded string, <i>s</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<constQByteArray& --> <h3 class="fn"><a name="operator-lt-lt-19"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qbytearray.html">QByteArray</a></span> & <i>b</i> )</h3> <p>Writes the byte array, <i>b</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator<<$$$operator<<constvoid* --> <h3 class="fn"><a name="operator-lt-lt-20"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type">void</span> * <i>p</i> )</h3> <p>Writes a pointer, <i>p</i>, to the stream and returns a reference to the stream.</p> <!-- @@@operator<< --> <!-- $$$operator=[overload1]$$$operator=constQDebug& --> <h3 class="fn"><a name="operator-eq"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator=</span> ( const <span class="type">QDebug</span> & <i>other</i> )</h3> <p>Assigns the <i>other</i> debug stream to this stream and returns a reference to this stream.</p> <!-- @@@operator= --> </div> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.</p> <br /> <p> 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.</p> <p> Documentation sources may be obtained from <a href="http://www.qt-project.org"> www.qt-project.org</a>.</p> <br /> <p> 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. <a title="Privacy Policy" href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p> </div> <script src="scripts/functions.js" type="text/javascript"></script> </body> </html>