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<td >Qt 5.12</td><td ><a href="qtqml-index.html">Qt QML</a></td><td ><a href="qtqml-module.html">C++ Classes</a></td><td >QQmlNetworkAccessManagerFactory</td></tr></table><table class="buildversion"><tr>
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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="#details">Detailed Description</a></li>
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<h1 class="title">QQmlNetworkAccessManagerFactory Class</h1>
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<p>The <a href="qqmlnetworkaccessmanagerfactory.html">QQmlNetworkAccessManagerFactory</a> class creates QNetworkAccessManager instances for a QML engine. <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 <QQmlNetworkAccessManagerFactory></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += qml</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.0</td></tr></table></div><ul>
<li><a href="qqmlnetworkaccessmanagerfactory-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"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qqmlnetworkaccessmanagerfactory.html#dtor.QQmlNetworkAccessManagerFactory">~QQmlNetworkAccessManagerFactory</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QNetworkAccessManager *</td><td class="memItemRight bottomAlign"><b><a href="qqmlnetworkaccessmanagerfactory.html#create">create</a></b>(QObject *<i>parent</i>) = 0</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qqmlnetworkaccessmanagerfactory.html">QQmlNetworkAccessManagerFactory</a> class creates QNetworkAccessManager instances for a QML engine.</p>
<p>A QML engine uses QNetworkAccessManager for all network access. By implementing a factory, it is possible to provide the QML engine with custom QNetworkAccessManager instances with specialized caching, proxy and cookies support.</p>
<p>To implement a factory, subclass <a href="qqmlnetworkaccessmanagerfactory.html">QQmlNetworkAccessManagerFactory</a> and implement the virtual <a href="qqmlnetworkaccessmanagerfactory.html#create">create</a>() method, then assign it to the relevant QML engine using <a href="qqmlengine.html#setNetworkAccessManagerFactory">QQmlEngine::setNetworkAccessManagerFactory</a>().</p>
<p>Note the QML engine may create QNetworkAccessManager instances from multiple threads. Because of this, the implementation of the <a href="qqmlnetworkaccessmanagerfactory.html#create">create</a>() method must be reentrant. In addition, the developer should be careful if the signals of the object to be returned from <a href="qqmlnetworkaccessmanagerfactory.html#create">create</a>() are connected to the slots of an object that may be created in a different thread:</p>
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<li>The QML engine internally handles all requests, and cleans up any QNetworkReply objects it creates. Receiving the QNetworkAccessManager::finished() signal in another thread may not provide the receiver with a valid reply object if it has already been deleted.</li>
<li>Authentication details provided to QNetworkAccessManager::authenticationRequired() must be provided immediately, so this signal cannot be connected as a Qt::QueuedConnection (or as the default Qt::AutoConnection from another thread).</li>
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<p>For more information about signals and threads, see Threads and QObjects and Signals and Slots Across Threads.</p>
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<p><b>See also </b><a href="qtqml-networkaccessmanagerfactory-example.html">Network Access Manager Factory Example</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="dtor.QQmlNetworkAccessManagerFactory"><a name="dtor.QQmlNetworkAccessManagerFactory"></a><code>[virtual] </code>QQmlNetworkAccessManagerFactory::<span class="name">~QQmlNetworkAccessManagerFactory</span>()</h3>
<p>Destroys the factory. The default implementation does nothing.</p>
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<h3 class="fn" id="create"><a name="create"></a><code>[pure virtual] </code><span class="type">QNetworkAccessManager</span> *QQmlNetworkAccessManagerFactory::<span class="name">create</span>(<span class="type">QObject</span> *<i>parent</i>)</h3>
<p>Creates and returns a network access manager with the specified <i>parent</i>. This method must return a new QNetworkAccessManager instance each time it is called.</p>
<p>Note: this method may be called by multiple threads, so ensure the implementation of this method is reentrant.</p>
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