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<li>Qt 5.2</li>
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Qt 5.2.1 Reference Documentation</li>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#protected-functions">Protected Functions</a></li>
<li class="level1"><a href="#macros">Macros</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QMetaDataReaderControl Class</h1>
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<p>The QMetaDataReaderControl class provides read access to the meta-data of a <a href="qmediaservice.html">QMediaService</a>'s media. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> </b><tt><span class="preprocessor">#include <QMetaDataReaderControl></span>
</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> <tt>QT += multimedia</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qmediacontrol.html">QMediaControl</a>.</td></tr></table><ul>
<li><a href="qmetadatareadercontrol-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#dtor.QMetaDataReaderControl">~QMetaDataReaderControl</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QStringList </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#availableMetaData">availableMetaData</a></b>() const = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#isMetaDataAvailable">isMetaDataAvailable</a></b>() const = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QVariant </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#metaData">metaData</a></b>(const QString &<i> key</i>) const = 0</td></tr>
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<h2>Signals</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#metaDataAvailableChanged">metaDataAvailableChanged</a></b>(bool<i> available</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#metaDataChanged">metaDataChanged</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#metaDataChanged-2">metaDataChanged</a></b>(const QString &<i> key</i>, const QVariant &<i> value</i>)</td></tr>
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<h2>Protected Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#QMetaDataReaderControl">QMetaDataReaderControl</a></b>(QObject *<i> parent</i> = 0)</td></tr>
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<h2>Macros</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmetadatareadercontrol.html#QMetaDataReaderControl_iid">QMetaDataReaderControl_iid</a></b></td></tr>
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<h2>Detailed Description</h2>
<p>The QMetaDataReaderControl class provides read access to the meta-data of a <a href="qmediaservice.html">QMediaService</a>'s media.</p>
<p>If a <a href="qmediaservice.html">QMediaService</a> can provide read or write access to the meta-data of its current media it will implement QMetaDataReaderControl. This control provides functions for both retrieving and setting meta-data values. Meta-data may be addressed by the keys defined in the <a href="qmediametadata.html">QMediaMetaData</a> namespace.</p>
<p>The functionality provided by this control is exposed to application code by the meta-data members of <a href="qmediaobject.html">QMediaObject</a>, and so meta-data access is potentially available in any of the media object classes. Any media service may implement QMetaDataReaderControl.</p>
<p>The interface name of QMetaDataReaderControl is <tt>org.qt-project.qt.metadatareadercontrol/5.0</tt> as defined in <a href="qmetadatareadercontrol.html#QMetaDataReaderControl_iid">QMetaDataReaderControl_iid</a>.</p>
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<p><b>See also </b><a href="qmediaservice.html#requestControl">QMediaService::requestControl</a>() and <a href="qmediaobject.html">QMediaObject</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn"><a name="QMetaDataReaderControl"></a>QMetaDataReaderControl::<span class="name">QMetaDataReaderControl</span>(<span class="type">QObject</span> *<i> parent</i> = 0)<tt> [protected]</tt></h3>
<p>Construct a <a href="qmetadatareadercontrol.html">QMetaDataReaderControl</a> with <i>parent</i>. This class is meant as a base class for service specific meta data providers so this constructor is protected.</p>
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<h3 class="fn"><a name="dtor.QMetaDataReaderControl"></a>QMetaDataReaderControl::<span class="name">~QMetaDataReaderControl</span>()</h3>
<p>Destroy the meta-data object.</p>
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<h3 class="fn"><a name="availableMetaData"></a><span class="type">QStringList</span> QMetaDataReaderControl::<span class="name">availableMetaData</span>() const<tt> [pure virtual]</tt></h3>
<p>Returns a list of keys there is meta-data available for.</p>
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<h3 class="fn"><a name="isMetaDataAvailable"></a><span class="type">bool</span> QMetaDataReaderControl::<span class="name">isMetaDataAvailable</span>() const<tt> [pure virtual]</tt></h3>
<p>Identifies if meta-data is available from a media service.</p>
<p>Returns true if the meta-data is available and false otherwise.</p>
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<h3 class="fn"><a name="metaData"></a><span class="type">QVariant</span> QMetaDataReaderControl::<span class="name">metaData</span>(const <span class="type">QString</span> &<i> key</i>) const<tt> [pure virtual]</tt></h3>
<p>Returns the meta-data for the given <i>key</i>.</p>
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<h3 class="fn"><a name="metaDataAvailableChanged"></a><span class="type">void</span> QMetaDataReaderControl::<span class="name">metaDataAvailableChanged</span>(<span class="type">bool</span><i> available</i>)<tt> [signal]</tt></h3>
<p>Signal the availability of meta-data has changed, <i>available</i> will be true if the multimedia object has meta-data.</p>
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<h3 class="fn"><a name="metaDataChanged"></a><span class="type">void</span> QMetaDataReaderControl::<span class="name">metaDataChanged</span>()<tt> [signal]</tt></h3>
<p>Signal the changes of meta-data.</p>
<p>If multiple meta-data elements are changed, metaDataChanged(const QString &key, const QVariant &value) signal is emitted for each of them with metaDataChanged() changed emitted once.</p>
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<h3 class="fn"><a name="metaDataChanged-2"></a><span class="type">void</span> QMetaDataReaderControl::<span class="name">metaDataChanged</span>(const <span class="type">QString</span> &<i> key</i>, const <span class="type">QVariant</span> &<i> value</i>)<tt> [signal]</tt></h3>
<p>Signal the changes of one meta-data element <i>value</i> with the given <i>key</i>.</p>
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<div class="macros">
<h2>Macro Documentation</h2>
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<h3 class="fn"><a name="QMetaDataReaderControl_iid"></a><span class="name">QMetaDataReaderControl_iid</span></h3>
<p><tt>org.qt-project.qt.metadatareadercontrol/5.0</tt></p>
<p>Defines the interface name of the <a href="qmetadatareadercontrol.html">QMetaDataReaderControl</a> class.</p>
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