<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qlogging.cpp --> <title>QMessageLogContext Class | Qt Core 5.12.6</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 >Qt 5.12</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QMessageLogContext</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.6 Reference Documentation</a></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-variables">Public Variables</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">QMessageLogContext Class</h1> <!-- $$$QMessageLogContext-brief --> <p>The <a href="qmessagelogcontext.html">QMessageLogContext</a> class provides additional information about a log message. <a href="#details">More...</a></p> <!-- @@@QMessageLogContext --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QMessageLogContext></span> </td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.0</td></tr></table></div><ul> <li><a href="qmessagelogcontext-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-variables"></a> <h2 id="public-variables">Public Variables</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> const char *</td><td class="memItemRight bottomAlign"><b><a href="qmessagelogcontext.html#category-var">category</a></b></td></tr> <tr><td class="memItemLeft rightAlign topAlign"> const char *</td><td class="memItemRight bottomAlign"><b><a href="qmessagelogcontext.html#file-var">file</a></b></td></tr> <tr><td class="memItemLeft rightAlign topAlign"> const char *</td><td class="memItemRight bottomAlign"><b><a href="qmessagelogcontext.html#function-var">function</a></b></td></tr> <tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmessagelogcontext.html#line-var">line</a></b></td></tr> <tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmessagelogcontext.html#version-var">version</a></b></td></tr> </table></div> <a name="details"></a> <!-- $$$QMessageLogContext-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>The <a href="qmessagelogcontext.html">QMessageLogContext</a> class provides additional information about a log message.</p> <p>The class provides information about the source code location a <a href="qtglobal.html#qDebug">qDebug</a>(), <a href="qtglobal.html#qInfo">qInfo</a>(), <a href="qtglobal.html#qWarning">qWarning</a>(), <a href="qtglobal.html#qCritical">qCritical</a>() or <a href="qtglobal.html#qFatal">qFatal</a>() message was generated.</p> <p><b>Note: </b>By default, this information is recorded only in debug builds. You can overwrite this explicitly by defining <code>QT_MESSAGELOGCONTEXT</code> or <code>QT_NO_MESSAGELOGCONTEXT</code>.</p></div> <p><b>See also </b><a href="qmessagelogger.html">QMessageLogger</a>, <a href="qtglobal.html#QtMessageHandler-typedef">QtMessageHandler</a>, and <a href="qtglobal.html#qInstallMessageHandler">qInstallMessageHandler</a>().</p> <!-- @@@QMessageLogContext --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 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. 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