<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qmediaservice.cpp --> <title>QMediaService 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 >QMediaService</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="#details">Detailed Description</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">QMediaService Class</h1> <!-- $$$QMediaService-brief --> <p>The <a href="qmediaservice.html">QMediaService</a> class provides a common base class for media service implementations. <a href="#details">More...</a></p> <!-- @@@QMediaService --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QMediaService></span> </td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += multimedia</td></tr></table></div><ul> <li><a href="qmediaservice-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="qmediaservice.html#dtor.QMediaService">~QMediaService</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#releaseControl">releaseControl</a></b>(QMediaControl *<i>control</i>) = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual QMediaControl *</td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#requestControl">requestControl</a></b>(const char *<i>name</i>) = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> T </td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#requestControl-1">requestControl</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="qmediaservice.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="qmediaservice.html#QMediaService">QMediaService</a></b>(QObject *<i>parent</i>)</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"> QMediaServicePrivate *</td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#d_ptr-var">d_ptr</a></b></td></tr> </table></div> <a name="details"></a> <!-- $$$QMediaService-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>The <a href="qmediaservice.html">QMediaService</a> class provides a common base class for media service implementations.</p> <p>Media services provide implementations of the functionality promised by media objects, and allow multiple providers to implement a <a href="qmediaobject.html">QMediaObject</a>.</p> <p>To provide the functionality of a <a href="qmediaobject.html">QMediaObject</a> media services implement <a href="qmediacontrol.html">QMediaControl</a> interfaces. Services typically implement one core media control which provides the core feature of a media object, and some number of additional controls which provide either optional features of the media object, or features of a secondary media object or peripheral object.</p> <p>A pointer to media service's <a href="qmediacontrol.html">QMediaControl</a> implementation can be obtained by passing the control's interface name to the <a href="qmediaservice.html#requestControl-1">requestControl</a>() function.</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>Media objects can use services loaded dynamically from plug-ins or implemented statically within an applications. Plug-in based services should also implement the <a href="qmediaserviceproviderplugin.html">QMediaServiceProviderPlugin</a> interface. Static services should implement the QMediaServiceProvider interface. In general, implementing a <a href="qmediaservice.html">QMediaService</a> is outside of the scope of this documentation and support on the relevant mailing lists or IRC channels should be sought.</p> </div> <p><b>See also </b><a href="qmediaobject.html">QMediaObject</a> and <a href="qmediacontrol.html">QMediaControl</a>.</p> <!-- @@@QMediaService --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QMediaService[overload1]$$$QMediaServiceQObject* --> <h3 class="fn" id="QMediaService"><a name="QMediaService"></a><code>[protected] </code>QMediaService::<span class="name">QMediaService</span>(<span class="type">QObject</span> *<i>parent</i>)</h3> <p>Construct a media service with the given <i>parent</i>. This class is meant as a base class for Multimedia services so this constructor is protected.</p> <!-- @@@QMediaService --> <!-- $$$~QMediaService[overload1]$$$~QMediaService --> <h3 class="fn" id="dtor.QMediaService"><a name="dtor.QMediaService"></a><code>[virtual] </code>QMediaService::<span class="name">~QMediaService</span>()</h3> <p>Destroys a media service.</p> <!-- @@@~QMediaService --> <!-- $$$releaseControl[overload1]$$$releaseControlQMediaControl* --> <h3 class="fn" id="releaseControl"><a name="releaseControl"></a><code>[pure virtual] </code><span class="type">void</span> QMediaService::<span class="name">releaseControl</span>(<span class="type"><a href="qmediacontrol.html">QMediaControl</a></span> *<i>control</i>)</h3> <!-- @@@releaseControl --> <!-- $$$requestControl[overload1]$$$requestControlconstchar* --> <h3 class="fn" id="requestControl"><a name="requestControl"></a><code>[pure virtual] </code><span class="type"><a href="qmediacontrol.html">QMediaControl</a></span> *QMediaService::<span class="name">requestControl</span>(const <span class="type">char</span> *<i>name</i>)</h3> <!-- @@@requestControl --> <!-- $$$requestControl$$$requestControl --> <h3 class="fn" id="requestControl-1"><a name="requestControl-1"></a><span class="type">T</span> QMediaService::<span class="name">requestControl</span>()</h3> <!-- @@@requestControl --> </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>