<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qmediacontrol.cpp --> <title>QMediaControl Class | Qt Multimedia 5.12.2</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="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="qtmultimedia-modules.html">C++ Classes</a></td><td >QMediaControl</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtmultimedia-index.html">Qt 5.12.2 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-functions">Public Functions</a></li> <li class="level1"><a href="#static-public-members">Static Public Members</a></li> <li class="level1"><a href="#protected-functions">Protected Functions</a></li> <li class="level1"><a href="#protected-variables">Protected Variables</a></li> <li class="level1"><a href="#macros">Macros</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">QMediaControl Class</h1> <!-- $$$QMediaControl-brief --> <p>The <a href="qmediacontrol.html">QMediaControl</a> class provides a base interface for media service controls. <a href="#details">More...</a></p> <!-- @@@QMediaControl --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QMediaControl></span> </td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += multimedia</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherited By:</td><td class="memItemRight bottomAlign"> <p><a href="qaudiodecodercontrol.html">QAudioDecoderControl</a>, <a href="qaudioencodersettingscontrol.html">QAudioEncoderSettingsControl</a>, <a href="qaudioinputselectorcontrol.html">QAudioInputSelectorControl</a>, <a href="qaudiooutputselectorcontrol.html">QAudioOutputSelectorControl</a>, <a href="qaudiorolecontrol.html">QAudioRoleControl</a>, <a href="qcameracapturebufferformatcontrol.html">QCameraCaptureBufferFormatControl</a>, <a href="qcameracapturedestinationcontrol.html">QCameraCaptureDestinationControl</a>, <a href="qcameracontrol.html">QCameraControl</a>, <a href="qcameraexposurecontrol.html">QCameraExposureControl</a>, <a href="qcamerafeedbackcontrol.html">QCameraFeedbackControl</a>, <a href="qcameraflashcontrol.html">QCameraFlashControl</a>, <a href="qcamerafocuscontrol.html">QCameraFocusControl</a>, <a href="qcameraimagecapturecontrol.html">QCameraImageCaptureControl</a>, <a href="qcameraimageprocessingcontrol.html">QCameraImageProcessingControl</a>, <a href="qcamerainfocontrol.html">QCameraInfoControl</a>, <a href="qcameralockscontrol.html">QCameraLocksControl</a>, <a href="qcameraviewfindersettingscontrol.html">QCameraViewfinderSettingsControl</a>, <a href="qcameraviewfindersettingscontrol2.html">QCameraViewfinderSettingsControl2</a>, <a href="qcamerazoomcontrol.html">QCameraZoomControl</a>, <a href="qcustomaudiorolecontrol.html">QCustomAudioRoleControl</a>, <a href="qimageencodercontrol.html">QImageEncoderControl</a>, <a href="qmediaaudioprobecontrol.html">QMediaAudioProbeControl</a>, <a href="qmediaavailabilitycontrol.html">QMediaAvailabilityControl</a>, <a href="qmediacontainercontrol.html">QMediaContainerControl</a>, <a href="qmediagaplessplaybackcontrol.html">QMediaGaplessPlaybackControl</a>, <a href="qmedianetworkaccesscontrol.html">QMediaNetworkAccessControl</a>, <a href="qmediaplayercontrol.html">QMediaPlayerControl</a>, <a href="qmediarecordercontrol.html">QMediaRecorderControl</a>, <a href="qmediastreamscontrol.html">QMediaStreamsControl</a>, <a href="qmediavideoprobecontrol.html">QMediaVideoProbeControl</a>, <a href="qmetadatareadercontrol.html">QMetaDataReaderControl</a>, <a href="qmetadatawritercontrol.html">QMetaDataWriterControl</a>, <a href="qradiodatacontrol.html">QRadioDataControl</a>, <a href="qradiotunercontrol.html">QRadioTunerControl</a>, <a href="qvideodeviceselectorcontrol.html">QVideoDeviceSelectorControl</a>, <a href="qvideoencodersettingscontrol.html">QVideoEncoderSettingsControl</a>, <a href="qvideorenderercontrol.html">QVideoRendererControl</a>, <a href="qvideowidgetcontrol.html">QVideoWidgetControl</a>, and <a href="qvideowindowcontrol.html">QVideoWindowControl</a></p> </td></tr></table></div><ul> <li><a href="qmediacontrol-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2 id="public-functions">Public Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qmediacontrol.html#dtor.QMediaControl">~QMediaControl</a></b>()</td></tr> </table></div> <a name="static-public-members"></a> <h2 id="static-public-members">Static Public Members</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qmediacontrol.html#staticMetaObject-var">staticMetaObject</a></b></td></tr> </table></div> <a name="protected-functions"></a> <h2 id="protected-functions">Protected Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmediacontrol.html#QMediaControl">QMediaControl</a></b>(QObject *<i>parent</i> = nullptr)</td></tr> </table></div> <a name="protected-variables"></a> <h2 id="protected-variables">Protected Variables</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> QMediaControlPrivate *</td><td class="memItemRight bottomAlign"><b><a href="qmediacontrol.html#d_ptr-var">d_ptr</a></b></td></tr> </table></div> <a name="macros"></a> <h2 id="macros">Macros</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmediacontrol.html#Q_MEDIA_DECLARE_CONTROL">Q_MEDIA_DECLARE_CONTROL</a></b>(<i>Class</i>, <i>IId</i>)</td></tr> </table></div> <a name="details"></a> <!-- $$$QMediaControl-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>The <a href="qmediacontrol.html">QMediaControl</a> class provides a base interface for media service controls.</p> <p>Media controls provide an interface to individual features provided by a media service. Most services implement a principal control which exposes the core functionality of the service and a number of optional controls which expose any additional functionality.</p> <p>A pointer to a control implemented by a media service can be obtained using the <a href="qmediaservice.html#requestControl-1">QMediaService::requestControl</a>() member of <a href="qmediaservice.html">QMediaService</a>. If the service doesn't implement a control it will instead return a null pointer.</p> <pre class="cpp"> <span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span>control <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span><span class="operator">></span>( mediaService<span class="operator">-</span><span class="operator">></span>requestControl(<span class="string">"org.qt-project.qt.mediaplayercontrol/5.0"</span>)); </pre> <p>Alternatively if the IId of the control has been declared using <a href="qmediacontrol.html#Q_MEDIA_DECLARE_CONTROL">Q_MEDIA_DECLARE_CONTROL</a> the template version of <a href="qmediaservice.html#requestControl-1">QMediaService::requestControl</a>() can be used to request the service without explicitly passing the IId or using qobject_cast().</p> <pre class="cpp"> <span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span>control <span class="operator">=</span> mediaService<span class="operator">-</span><span class="operator">></span>requestControl<span class="operator"><</span><span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span><span class="operator">></span>(); </pre> <p>Most application code will not interface directly with a media service's controls, instead the <a href="qmediaobject.html">QMediaObject</a> which owns the service acts as an intermediary between one or more controls and the application.</p> </div> <p><b>See also </b><a href="qmediaservice.html">QMediaService</a> and <a href="qmediaobject.html">QMediaObject</a>.</p> <!-- @@@QMediaControl --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QMediaControl[overload1]$$$QMediaControlQObject* --> <h3 class="fn" id="QMediaControl"><a name="QMediaControl"></a><code>[protected] </code>QMediaControl::<span class="name">QMediaControl</span>(<span class="type">QObject</span> *<i>parent</i> = nullptr)</h3> <p>Constructs a media control with the given <i>parent</i>.</p> <!-- @@@QMediaControl --> <!-- $$$~QMediaControl[overload1]$$$~QMediaControl --> <h3 class="fn" id="dtor.QMediaControl"><a name="dtor.QMediaControl"></a><code>[virtual] </code>QMediaControl::<span class="name">~QMediaControl</span>()</h3> <p>Destroys a media control.</p> <!-- @@@~QMediaControl --> </div> <div class="macros"> <h2>Macro Documentation</h2> <!-- $$$Q_MEDIA_DECLARE_CONTROL[overload1]$$$Q_MEDIA_DECLARE_CONTROL --> <h3 class="fn" id="Q_MEDIA_DECLARE_CONTROL"><a name="Q_MEDIA_DECLARE_CONTROL"></a><span class="name">Q_MEDIA_DECLARE_CONTROL</span>(<i>Class</i>, <i>IId</i>)</h3> <p>The Q_MEDIA_DECLARE_CONTROL macro declares an <i>IId</i> for a <i>Class</i> that inherits from <a href="qmediacontrol.html">QMediaControl</a>.</p> <p>Declaring an IId for a <a href="qmediacontrol.html">QMediaControl</a> allows an instance of that control to be requested from <a href="qmediaservice.html#requestControl-1">QMediaService::requestControl</a>() without explicitly passing the IId.</p> <pre class="cpp"> <span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span>control <span class="operator">=</span> mediaService<span class="operator">-</span><span class="operator">></span>requestControl<span class="operator"><</span><span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span><span class="operator">></span>(); </pre> <p><b>See also </b><a href="qmediaservice.html#requestControl-1">QMediaService::requestControl</a>().</p> <!-- @@@Q_MEDIA_DECLARE_CONTROL --> </div> </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. All other trademarks are property of their respective owners. </p> </div> </body> </html>