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<td >Qt 5.9</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-module.html">C++ Classes</a></td><td >QAbstractNetworkCache</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="#protected-functions">Protected Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QAbstractNetworkCache Class</h1>
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<p>The <a href="qabstractnetworkcache.html">QAbstractNetworkCache</a> class provides the interface for cache implementations. <a href="#details">More...</a></p>
<!-- @@@QAbstractNetworkCache -->
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QAbstractNetworkCache&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += network</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign">  Qt 4.5</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="../qtcore/qobject.html">QObject</a></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherited By:</td><td class="memItemRight bottomAlign"> <p><a href="qnetworkdiskcache.html">QNetworkDiskCache</a></p>
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<li><a href="qabstractnetworkcache-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<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="qabstractnetworkcache.html#dtor.QAbstractNetworkCache">~QAbstractNetworkCache</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual qint64 </td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#cacheSize">cacheSize</a></b>() const = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QIODevice *</td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#data">data</a></b>(const QUrl &amp;<i>url</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#insert">insert</a></b>(QIODevice *<i>device</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QNetworkCacheMetaData </td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#metaData">metaData</a></b>(const QUrl &amp;<i>url</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QIODevice *</td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#prepare">prepare</a></b>(const QNetworkCacheMetaData &amp;<i>metaData</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#remove">remove</a></b>(const QUrl &amp;<i>url</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#updateMetaData">updateMetaData</a></b>(const QNetworkCacheMetaData &amp;<i>metaData</i>) = 0</td></tr>
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<li class="fn">32 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li>
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<a name="public-slots"></a>
<h2 id="public-slots">Public Slots</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#clear">clear</a></b>() = 0</td></tr>
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<ul>
<li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li>
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<a name="protected-functions"></a>
<h2 id="protected-functions">Protected Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qabstractnetworkcache.html#QAbstractNetworkCache">QAbstractNetworkCache</a></b>(QObject *<i>parent</i> = Q_NULLPTR)</td></tr>
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<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
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<h3>Additional Inherited Members</h3>
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<li class="fn">1 property inherited from <a href="../qtcore/qobject.html#properties">QObject</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">10 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
<li class="fn">2 protected variables inherited from <a href="../qtcore/qobject.html#protected-variables">QObject</a></li>
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<a name="details"></a>
<!-- $$$QAbstractNetworkCache-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qabstractnetworkcache.html">QAbstractNetworkCache</a> class provides the interface for cache implementations.</p>
<p><a href="qabstractnetworkcache.html">QAbstractNetworkCache</a> is the base class for every standard cache that is used by <a href="qnetworkaccessmanager.html">QNetworkAccessManager</a>. <a href="qabstractnetworkcache.html">QAbstractNetworkCache</a> is an abstract class and cannot be instantiated.</p>
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<p><b>See also </b><a href="qnetworkdiskcache.html">QNetworkDiskCache</a>.</p>
<!-- @@@QAbstractNetworkCache -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QAbstractNetworkCache[overload1]$$$QAbstractNetworkCacheQObject* -->
<h3 class="fn" id="QAbstractNetworkCache"><a name="QAbstractNetworkCache"></a><code>[protected] </code>QAbstractNetworkCache::<span class="name">QAbstractNetworkCache</span>(<span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = Q_NULLPTR)</h3>
<p>Constructs an abstract network cache with the given <i>parent</i>.</p>
<!-- @@@QAbstractNetworkCache -->
<!-- $$$~QAbstractNetworkCache[overload1]$$$~QAbstractNetworkCache -->
<h3 class="fn" id="dtor.QAbstractNetworkCache"><a name="dtor.QAbstractNetworkCache"></a><code>[virtual] </code>QAbstractNetworkCache::<span class="name">~QAbstractNetworkCache</span>()</h3>
<p>Destroys the cache.</p>
<p>Any operations that have not been inserted are discarded.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#insert">insert</a>().</p>
<!-- @@@~QAbstractNetworkCache -->
<!-- $$$cacheSize[overload1]$$$cacheSize -->
<h3 class="fn" id="cacheSize"><a name="cacheSize"></a><code>[pure virtual] </code><span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> QAbstractNetworkCache::<span class="name">cacheSize</span>() const</h3>
<p>Returns the current size taken up by the cache. Depending upon the cache implementation this might be disk or memory size.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#clear">clear</a>().</p>
<!-- @@@cacheSize -->
<!-- $$$clear[overload1]$$$clear -->
<h3 class="fn" id="clear"><a name="clear"></a><code>[pure virtual slot] </code><span class="type">void</span> QAbstractNetworkCache::<span class="name">clear</span>()</h3>
<p>Removes all items from the cache. Unless there was failures clearing the cache <a href="qabstractnetworkcache.html#cacheSize">cacheSize</a>() should return 0 after a call to clear.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#cacheSize">cacheSize</a>() and <a href="qabstractnetworkcache.html#remove">remove</a>().</p>
<!-- @@@clear -->
<!-- $$$data[overload1]$$$dataconstQUrl& -->
<h3 class="fn" id="data"><a name="data"></a><code>[pure virtual] </code><span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span> *QAbstractNetworkCache::<span class="name">data</span>(const <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> &amp;<i>url</i>)</h3>
<p>Returns the data associated with <i>url</i>.</p>
<p>It is up to the application that requests the data to delete the <a href="../qtcore/qiodevice.html">QIODevice</a> when done with it.</p>
<p>If there is no cache for <i>url</i>, the url is invalid, or if there is an internal cache error 0 is returned.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#metaData">metaData</a>() and <a href="qabstractnetworkcache.html#prepare">prepare</a>().</p>
<!-- @@@data -->
<!-- $$$insert[overload1]$$$insertQIODevice* -->
<h3 class="fn" id="insert"><a name="insert"></a><code>[pure virtual] </code><span class="type">void</span> QAbstractNetworkCache::<span class="name">insert</span>(<span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span> *<i>device</i>)</h3>
<p>Inserts the data in <i>device</i> and the prepared meta data into the cache. After this function is called the data and meta data should be retrievable using <a href="qabstractnetworkcache.html#data">data</a>() and <a href="qabstractnetworkcache.html#metaData">metaData</a>().</p>
<p>To cancel a prepared inserted call <a href="qabstractnetworkcache.html#remove">remove</a>() on the metadata's url.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#prepare">prepare</a>() and <a href="qabstractnetworkcache.html#remove">remove</a>().</p>
<!-- @@@insert -->
<!-- $$$metaData[overload1]$$$metaDataconstQUrl& -->
<h3 class="fn" id="metaData"><a name="metaData"></a><code>[pure virtual] </code><span class="type"><a href="qnetworkcachemetadata.html">QNetworkCacheMetaData</a></span> QAbstractNetworkCache::<span class="name">metaData</span>(const <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> &amp;<i>url</i>)</h3>
<p>Returns the meta data for the url <i>url</i>.</p>
<p>If the url is valid and the cache contains the data for url, a valid <a href="qnetworkcachemetadata.html">QNetworkCacheMetaData</a> is returned.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#updateMetaData">updateMetaData</a>() and <a href="qabstractnetworkcache.html#data">data</a>().</p>
<!-- @@@metaData -->
<!-- $$$prepare[overload1]$$$prepareconstQNetworkCacheMetaData& -->
<h3 class="fn" id="prepare"><a name="prepare"></a><code>[pure virtual] </code><span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span> *QAbstractNetworkCache::<span class="name">prepare</span>(const <span class="type"><a href="qnetworkcachemetadata.html">QNetworkCacheMetaData</a></span> &amp;<i>metaData</i>)</h3>
<p>Returns the device that should be populated with the data for the cache item <i>metaData</i>. When all of the data has been written <a href="qabstractnetworkcache.html#insert">insert</a>() should be called. If <a href="qabstractnetworkcache.html#metaData">metaData</a> is invalid or the url in the metadata is invalid 0 is returned.</p>
<p>The cache owns the device and will take care of deleting it when it is inserted or removed.</p>
<p>To cancel a prepared inserted call <a href="qabstractnetworkcache.html#remove">remove</a>() on the metadata's url.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#remove">remove</a>(), <a href="qabstractnetworkcache.html#updateMetaData">updateMetaData</a>(), and <a href="qabstractnetworkcache.html#insert">insert</a>().</p>
<!-- @@@prepare -->
<!-- $$$remove[overload1]$$$removeconstQUrl& -->
<h3 class="fn" id="remove"><a name="remove"></a><code>[pure virtual] </code><span class="type">bool</span> QAbstractNetworkCache::<span class="name">remove</span>(const <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> &amp;<i>url</i>)</h3>
<p>Removes the cache entry for <i>url</i>, returning true if success otherwise false.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#clear">clear</a>() and <a href="qabstractnetworkcache.html#prepare">prepare</a>().</p>
<!-- @@@remove -->
<!-- $$$updateMetaData[overload1]$$$updateMetaDataconstQNetworkCacheMetaData& -->
<h3 class="fn" id="updateMetaData"><a name="updateMetaData"></a><code>[pure virtual] </code><span class="type">void</span> QAbstractNetworkCache::<span class="name">updateMetaData</span>(const <span class="type"><a href="qnetworkcachemetadata.html">QNetworkCacheMetaData</a></span> &amp;<i>metaData</i>)</h3>
<p>Updates the cache meta date for the <a href="qabstractnetworkcache.html#metaData">metaData</a>'s url to <i>metaData</i></p>
<p>If the cache does not contains a cache item for the url then no action is taken.</p>
<p>In the base class this is a pure virtual function.</p>
<p><b>See also </b><a href="qabstractnetworkcache.html#metaData">metaData</a>() and <a href="qabstractnetworkcache.html#prepare">prepare</a>().</p>
<!-- @@@updateMetaData -->
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