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<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-module.html">C++ Classes</a></td><td >QErrorMessage</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#public-slots">Public Slots</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</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>
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<h1 class="title">QErrorMessage Class</h1>
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<p>The <a href="qerrormessage.html">QErrorMessage</a> class provides an error message display dialog. <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 <QErrorMessage></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += widgets</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qdialog.html">QDialog</a></td></tr></table></div><ul>
<li><a href="qerrormessage-members.html">List of all members, including inherited members</a></li>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qerrormessage.html#QErrorMessage">QErrorMessage</a></b>(QWidget *<i>parent</i> = Q_NULLPTR)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qerrormessage.html#dtor.QErrorMessage">~QErrorMessage</a></b>()</td></tr>
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<li class="fn">8 public functions inherited from <a href="qdialog.html#public-functions">QDialog</a></li>
<li class="fn">214 public functions inherited from <a href="qwidget.html#public-functions">QWidget</a></li>
<li class="fn">32 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li>
<li class="fn">14 public functions inherited from <a href="../qtgui/qpaintdevice.html#public-functions">QPaintDevice</a></li>
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<h2 id="public-slots">Public Slots</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qerrormessage.html#showMessage">showMessage</a></b>(const QString &<i>message</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qerrormessage.html#showMessage-1">showMessage</a></b>(const QString &<i>message</i>, const QString &<i>type</i>)</td></tr>
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<li class="fn">5 public slots inherited from <a href="qdialog.html#public-slots">QDialog</a></li>
<li class="fn">19 public slots inherited from <a href="qwidget.html#public-slots">QWidget</a></li>
<li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li>
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<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QErrorMessage *</td><td class="memItemRight bottomAlign"><b><a href="qerrormessage.html#qtHandler">qtHandler</a></b>()</td></tr>
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<li class="fn">5 static public members inherited from <a href="qwidget.html#static-public-members">QWidget</a></li>
<li class="fn">10 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
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<h2 id="reimplemented-protected-functions">Reimplemented Protected Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qerrormessage.html#changeEvent">changeEvent</a></b>(QEvent *<i>e</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qerrormessage.html#done">done</a></b>(int <i>a</i>)</td></tr>
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<li class="fn">6 protected functions inherited from <a href="qdialog.html#protected-functions">QDialog</a></li>
<li class="fn">35 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
<li class="fn">1 protected function inherited from <a href="../qtgui/qpaintdevice.html#protected-functions">QPaintDevice</a></li>
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<h3>Additional Inherited Members</h3>
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<li class="fn">2 properties inherited from <a href="qdialog.html#properties">QDialog</a></li>
<li class="fn">59 properties inherited from <a href="qwidget.html#properties">QWidget</a></li>
<li class="fn">1 property inherited from <a href="../qtcore/qobject.html#properties">QObject</a></li>
<li class="fn">3 signals inherited from <a href="qdialog.html#signals">QDialog</a></li>
<li class="fn">3 signals inherited from <a href="qwidget.html#signals">QWidget</a></li>
<li class="fn">2 signals inherited from <a href="../qtcore/qobject.html#signals">QObject</a></li>
<li class="fn">1 public variable inherited from <a href="../qtcore/qobject.html#public-variables">QObject</a></li>
<li class="fn">6 protected functions inherited from <a href="qdialog.html#protected-functions">QDialog</a></li>
<li class="fn">35 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
<li class="fn">1 protected function inherited from <a href="../qtgui/qpaintdevice.html#protected-functions">QPaintDevice</a></li>
<li class="fn">1 protected slot inherited from <a href="qwidget.html#protected-slots">QWidget</a></li>
<li class="fn">2 protected variables inherited from <a href="../qtcore/qobject.html#protected-variables">QObject</a></li>
<li class="fn">1 protected type inherited from <a href="../qtgui/qpaintdevice.html#protected-variables">QPaintDevice</a></li>
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<a name="details"></a>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qerrormessage.html">QErrorMessage</a> class provides an error message display dialog.</p>
<p>An error message widget consists of a text label and a checkbox. The checkbox lets the user control whether the same error message will be displayed again in the future, typically displaying the text, "Show this message again" translated into the appropriate local language.</p>
<p>For production applications, the class can be used to display messages which the user only needs to see once. To use <a href="qerrormessage.html">QErrorMessage</a> like this, you create the dialog in the usual way, and show it by calling the <a href="qerrormessage.html#showMessage">showMessage</a>() slot or connecting signals to it.</p>
<p>The static <a href="qerrormessage.html#qtHandler">qtHandler</a>() function installs a message handler using <a href="../qtcore/qtglobal.html#qInstallMessageHandler">qInstallMessageHandler</a>() and creates a <a href="qerrormessage.html">QErrorMessage</a> that displays <a href="../qtcore/qtglobal.html#qDebug">qDebug</a>(), <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() and <a href="../qtcore/qtglobal.html#qFatal">qFatal</a>() messages. This is most useful in environments where no console is available to display warnings and error messages.</p>
<p>In both cases <a href="qerrormessage.html">QErrorMessage</a> will queue pending messages and display them in order, with each new message being shown as soon as the user has accepted the previous message. Once the user has specified that a message is not to be shown again it is automatically skipped, and the dialog will show the next appropriate message in the queue.</p>
<p>The <a href="qtwidgets-dialogs-standarddialogs-example.html">Standard Dialogs</a> example shows how to use <a href="qerrormessage.html">QErrorMessage</a> as well as other built-in Qt dialogs.</p>
<p class="centerAlign"><img src="images/qerrormessage.png" alt="" /></p></div>
<p><b>See also </b><a href="qmessagebox.html">QMessageBox</a>, <a href="qstatusbar.html#showMessage">QStatusBar::showMessage</a>(), and <a href="qtwidgets-dialogs-standarddialogs-example.html">Standard Dialogs Example</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QErrorMessage"><a name="QErrorMessage"></a>QErrorMessage::<span class="name">QErrorMessage</span>(<span class="type"><a href="qwidget.html#QWidget">QWidget</a></span> *<i>parent</i> = Q_NULLPTR)</h3>
<p>Constructs and installs an error handler window with the given <i>parent</i>.</p>
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<h3 class="fn" id="dtor.QErrorMessage"><a name="dtor.QErrorMessage"></a>QErrorMessage::<span class="name">~QErrorMessage</span>()</h3>
<p>Destroys the error message dialog.</p>
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<h3 class="fn" id="changeEvent"><a name="changeEvent"></a><code>[virtual protected] </code><span class="type">void</span> QErrorMessage::<span class="name">changeEvent</span>(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> *<i>e</i>)</h3>
<p>Reimplemented from <a href="qwidget.html#changeEvent">QWidget::changeEvent</a>().</p>
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<h3 class="fn" id="done"><a name="done"></a><code>[virtual protected] </code><span class="type">void</span> QErrorMessage::<span class="name">done</span>(<span class="type">int</span> <i>a</i>)</h3>
<p>Reimplemented from <a href="qdialog.html#done">QDialog::done</a>().</p>
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<h3 class="fn" id="qtHandler"><a name="qtHandler"></a><code>[static] </code><span class="type"><a href="qerrormessage.html#QErrorMessage">QErrorMessage</a></span> *QErrorMessage::<span class="name">qtHandler</span>()</h3>
<p>Returns a pointer to a <a href="qerrormessage.html">QErrorMessage</a> object that outputs the default Qt messages. This function creates such an object, if there isn't one already.</p>
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<!-- $$$showMessage[overload1]$$$showMessageconstQString& -->
<h3 class="fn" id="showMessage"><a name="showMessage"></a><code>[slot] </code><span class="type">void</span> QErrorMessage::<span class="name">showMessage</span>(const <span class="type"><a href="../qtcore/qstring.html">QString</a></span> &<i>message</i>)</h3>
<p>Shows the given message, <i>message</i>, and returns immediately. If the user has requested for the message not to be shown again, this function does nothing.</p>
<p>Normally, the message is displayed immediately. However, if there are pending messages, it will be queued to be displayed later.</p>
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<h3 class="fn" id="showMessage-1"><a name="showMessage-1"></a><code>[slot] </code><span class="type">void</span> QErrorMessage::<span class="name">showMessage</span>(const <span class="type"><a href="../qtcore/qstring.html">QString</a></span> &<i>message</i>, const <span class="type"><a href="../qtcore/qstring.html">QString</a></span> &<i>type</i>)</h3>
<p>This is an overloaded function.</p>
<p>Shows the given message, <i>message</i>, and returns immediately. If the user has requested for messages of type, <i>type</i>, not to be shown again, this function does nothing.</p>
<p>Normally, the message is displayed immediately. However, if there are pending messages, it will be queued to be displayed later.</p>
<p>This function was introduced in Qt 4.5.</p>
<p><b>See also </b><a href="qerrormessage.html#showMessage">showMessage</a>().</p>
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