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<td >Qt 5.12</td><td ><a href="qtqml-index.html">Qt QML</a></td><td >QtQml Namespace</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtqml-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#functions">Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QtQml Namespace</h1>
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<p>Provides functions for producing logging messages for QML types. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QtQml></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += qml</td></tr></table></div><ul>
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<a name="functions"></a>
<h2 id="functions">Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QQmlInfo </td><td class="memItemRight bottomAlign"><b><a href="qqmlengine.html#qmlDebug">qmlDebug</a></b>(const QObject *<i>object</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QQmlInfo </td><td class="memItemRight bottomAlign"><b><a href="qqmlengine.html#qmlInfo">qmlInfo</a></b>(const QObject *<i>object</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QQmlInfo </td><td class="memItemRight bottomAlign"><b><a href="qqmlengine.html#qmlWarning">qmlWarning</a></b>(const QObject *<i>object</i>)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>Provides functions for producing logging messages for QML types.</p>
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<h2>Function Documentation</h2>
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<h3 class="fn" id="qmlDebug"><a name="qmlDebug"></a><span class="type">QQmlInfo</span> QtQml::<span class="name">qmlDebug</span>(const <span class="type">QObject</span> *<i>object</i>)</h3>
<p>Prints debug messages that include the file and line number for the specified QML <i>object</i>.</p>
<p>When QML types produce logging messages, it improves traceability if they include the QML file and line number on which the particular instance was instantiated.</p>
<p>To include the file and line number, an object must be passed. If the file and line number is not available for that instance (either it was not instantiated by the QML engine or location information is disabled), "unknown location" will be used instead. For example,</p>
<pre class="cpp">
qmlDebug(object) <span class="operator"><</span><span class="operator"><</span> <span class="string">"Internal state: 42"</span>;
</pre>
<p>prints</p>
<pre class="cpp plain">
QML MyCustomType (unknown location): Internal state: 42
</pre>
<p>This function was introduced in Qt 5.9.</p>
<p><b>See also </b><a href="qqmlengine.html#qmlInfo">QtQml::qmlInfo</a> and <a href="qqmlengine.html#qmlWarning">QtQml::qmlWarning</a>.</p>
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<h3 class="fn" id="qmlInfo"><a name="qmlInfo"></a><span class="type">QQmlInfo</span> QtQml::<span class="name">qmlInfo</span>(const <span class="type">QObject</span> *<i>object</i>)</h3>
<p>Prints informational messages that include the file and line number for the specified QML <i>object</i>.</p>
<p>When QML types produce logging messages, it improves traceability if they include the QML file and line number on which the particular instance was instantiated.</p>
<p>To include the file and line number, an object must be passed. If the file and line number is not available for that instance (either it was not instantiated by the QML engine or location information is disabled), "unknown location" will be used instead.</p>
<p>For example,</p>
<pre class="cpp">
qmlInfo(object) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"component property is a write-once property"</span>);
</pre>
<p>prints</p>
<pre class="cpp plain">
QML MyCustomType (unknown location): component property is a write-once property
</pre>
<p><b>Note: </b>In versions prior to Qt 5.9, qmlInfo reported messages using a warning QtMsgType. For Qt 5.9 and above, qmlInfo uses an info QtMsgType. To send warnings, use <a href="qqmlengine.html#qmlWarning">qmlWarning</a>.</p><p><b>See also </b><a href="qqmlengine.html#qmlDebug">QtQml::qmlDebug</a> and <a href="qqmlengine.html#qmlWarning">QtQml::qmlWarning</a>.</p>
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<h3 class="fn" id="qmlWarning"><a name="qmlWarning"></a><span class="type">QQmlInfo</span> QtQml::<span class="name">qmlWarning</span>(const <span class="type">QObject</span> *<i>object</i>)</h3>
<p>Prints warning messages that include the file and line number for the specified QML <i>object</i>.</p>
<p>When QML types produce logging messages, it improves traceability if they include the QML file and line number on which the particular instance was instantiated.</p>
<p>To include the file and line number, an object must be passed. If the file and line number is not available for that instance (either it was not instantiated by the QML engine or location information is disabled), "unknown location" will be used instead.</p>
<p>For example,</p>
<pre class="cpp">
qmlInfo(object) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"property cannot be set to 0"</span>);
</pre>
<p>prints</p>
<pre class="cpp plain">
QML MyCustomType (unknown location): property cannot be set to 0
</pre>
<p>This function was introduced in Qt 5.9.</p>
<p><b>See also </b><a href="qqmlengine.html#qmlDebug">QtQml::qmlDebug</a> and <a href="qqmlengine.html#qmlInfo">QtQml::qmlInfo</a>.</p>
<!-- @@@qmlWarning -->
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