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<td >Qt 5.12</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QTemporaryFile</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#reimplemented-public-functions">Reimplemented Public Functions</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#reimplemented-protected-functions">Reimplemented Protected Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QTemporaryFile Class</h1>
<!-- $$$QTemporaryFile-brief -->
<p>The <a href="qtemporaryfile.html">QTemporaryFile</a> class is an I/O device that operates on temporary files. <a href="#details">More...</a></p>
<!-- @@@QTemporaryFile -->
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QTemporaryFile></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qfile.html">QFile</a></td></tr></table></div><ul>
<li><a href="qtemporaryfile-members.html">List of all members, including inherited members</a></li>
<li><a href="qtemporaryfile-obsolete.html">Obsolete members</a></li>
</ul>
<p><b>Note:</b> All functions in this class are reentrant.</p>
<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#QTemporaryFile">QTemporaryFile</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#QTemporaryFile-1">QTemporaryFile</a></b>(const QString &<i>templateName</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#QTemporaryFile-2">QTemporaryFile</a></b>(QObject *<i>parent</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#QTemporaryFile-3">QTemporaryFile</a></b>(const QString &<i>templateName</i>, QObject *<i>parent</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#dtor.QTemporaryFile">~QTemporaryFile</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#autoRemove">autoRemove</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#fileTemplate">fileTemplate</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#open">open</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#setAutoRemove">setAutoRemove</a></b>(bool <i>b</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#setFileTemplate">setFileTemplate</a></b>(const QString &<i>name</i>)</td></tr>
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<a name="reimplemented-public-functions"></a>
<h2 id="reimplemented-public-functions">Reimplemented Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual QString </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#fileName">fileName</a></b>() const override</td></tr>
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<ul>
<li class="fn">15 public functions inherited from <a href="qfile.html#public-functions">QFile</a></li>
<li class="fn">18 public functions inherited from <a href="qfiledevice.html#public-functions">QFileDevice</a></li>
<li class="fn">44 public functions inherited from <a href="qiodevice.html#public-functions">QIODevice</a></li>
<li class="fn">32 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
</ul>
<a name="static-public-members"></a>
<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QTemporaryFile *</td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#createNativeFile">createNativeFile</a></b>(QFile &<i>file</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QTemporaryFile *</td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#createNativeFile-1">createNativeFile</a></b>(const QString &<i>fileName</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#staticMetaObject-var">staticMetaObject</a></b></td></tr>
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<ul>
<li class="fn">12 static public members inherited from <a href="qfile.html#static-public-members">QFile</a></li>
<li class="fn">10 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
</ul>
<a name="reimplemented-protected-functions"></a>
<h2 id="reimplemented-protected-functions">Reimplemented Protected Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qtemporaryfile.html#open-1">open</a></b>(QIODevice::OpenMode <i>flags</i>) override</td></tr>
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<ul>
<li class="fn">3 protected functions inherited from <a href="qfiledevice.html#protected-functions">QFileDevice</a></li>
<li class="fn">5 protected functions inherited from <a href="qiodevice.html#protected-functions">QIODevice</a></li>
<li class="fn">9 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">6 signals inherited from <a href="qiodevice.html#signals">QIODevice</a></li>
<li class="fn">2 signals inherited from <a href="qobject.html#signals">QObject</a></li>
<li class="fn">3 protected functions inherited from <a href="qfiledevice.html#protected-functions">QFileDevice</a></li>
<li class="fn">5 protected functions inherited from <a href="qiodevice.html#protected-functions">QIODevice</a></li>
<li class="fn">9 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QTemporaryFile-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qtemporaryfile.html">QTemporaryFile</a> class is an I/O device that operates on temporary files.</p>
<p><a href="qtemporaryfile.html">QTemporaryFile</a> is used to create unique temporary files safely. The file itself is created by calling <a href="qtemporaryfile.html#open">open</a>(). The name of the temporary file is guaranteed to be unique (i.e., you are guaranteed to not overwrite an existing file), and the file will subsequently be removed upon destruction of the <a href="qtemporaryfile.html">QTemporaryFile</a> object. This is an important technique that avoids data corruption for applications that store data in temporary files. The file name is either auto-generated, or created based on a template, which is passed to <a href="qtemporaryfile.html">QTemporaryFile</a>'s constructor.</p>
<p>Example:</p>
<pre class="cpp">
<span class="comment">// Within a function/method...</span>
<span class="type"><a href="qtemporaryfile.html#QTemporaryFile">QTemporaryFile</a></span> file;
<span class="keyword">if</span> (file<span class="operator">.</span>open()) {
<span class="comment">// file.fileName() returns the unique file name</span>
}
<span class="comment">// The QTemporaryFile destructor removes the temporary file</span>
<span class="comment">// as it goes out of scope.</span>
</pre>
<p>Reopening a <a href="qtemporaryfile.html">QTemporaryFile</a> after calling <a href="qfiledevice.html#close">close</a>() is safe. For as long as the <a href="qtemporaryfile.html">QTemporaryFile</a> object itself is not destroyed, the unique temporary file will exist and be kept open internally by <a href="qtemporaryfile.html">QTemporaryFile</a>.</p>
<p>The file name of the temporary file can be found by calling <a href="qtemporaryfile.html#fileName">fileName</a>(). Note that this is only defined after the file is first opened; the function returns an empty string before this.</p>
<p>A temporary file will have some static part of the name and some part that is calculated to be unique. The default filename will be determined from <a href="qcoreapplication.html#applicationName-prop">QCoreApplication::applicationName</a>() (otherwise <code>qt_temp</code>) and will be placed into the temporary path as returned by <a href="qdir.html#tempPath">QDir::tempPath</a>(). If you specify your own filename, a relative file path will not be placed in the temporary directory by default, but be relative to the current working directory.</p>
<p>Specified filenames can contain the following template <code>XXXXXX</code> (six upper case "X" characters), which will be replaced by the auto-generated portion of the filename. Note that the template is case sensitive. If the template is not present in the filename, <a href="qtemporaryfile.html">QTemporaryFile</a> appends the generated part to the filename given.</p>
</div>
<p><b>See also </b><a href="qdir.html#tempPath">QDir::tempPath</a>() and <a href="qfile.html">QFile</a>.</p>
<!-- @@@QTemporaryFile -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QTemporaryFile[overload1]$$$QTemporaryFile -->
<h3 class="fn" id="QTemporaryFile"><a name="QTemporaryFile"></a>QTemporaryFile::<span class="name">QTemporaryFile</span>()</h3>
<p>Constructs a <a href="qtemporaryfile.html">QTemporaryFile</a> using as file template the application name returned by <a href="qcoreapplication.html#applicationName-prop">QCoreApplication::applicationName</a>() (otherwise <code>qt_temp</code>) followed by ".XXXXXX". The file is stored in the system's temporary directory, <a href="qdir.html#tempPath">QDir::tempPath</a>().</p>
<p><b>See also </b><a href="qtemporaryfile.html#setFileTemplate">setFileTemplate</a>() and <a href="qdir.html#tempPath">QDir::tempPath</a>().</p>
<!-- @@@QTemporaryFile -->
<!-- $$$QTemporaryFile$$$QTemporaryFileconstQString& -->
<h3 class="fn" id="QTemporaryFile-1"><a name="QTemporaryFile-1"></a>QTemporaryFile::<span class="name">QTemporaryFile</span>(const <span class="type"><a href="qstring.html">QString</a></span> &<i>templateName</i>)</h3>
<p>Constructs a <a href="qtemporaryfile.html">QTemporaryFile</a> with a template filename of <i>templateName</i>. Upon opening the temporary file this will be used to create a unique filename.</p>
<p>If the <i>templateName</i> does not contain XXXXXX it will automatically be appended and used as the dynamic portion of the filename.</p>
<p>If <i>templateName</i> is a relative path, the path will be relative to the current working directory. You can use <a href="qdir.html#tempPath">QDir::tempPath</a>() to construct <i>templateName</i> if you want use the system's temporary directory.</p>
<p><b>See also </b><a href="qtemporaryfile.html#open">open</a>() and <a href="qtemporaryfile.html#fileTemplate">fileTemplate</a>().</p>
<!-- @@@QTemporaryFile -->
<!-- $$$QTemporaryFile$$$QTemporaryFileQObject* -->
<h3 class="fn" id="QTemporaryFile-2"><a name="QTemporaryFile-2"></a>QTemporaryFile::<span class="name">QTemporaryFile</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>parent</i>)</h3>
<p>Constructs a <a href="qtemporaryfile.html">QTemporaryFile</a> (with the given <i>parent</i>) using as file template the application name returned by <a href="qcoreapplication.html#applicationName-prop">QCoreApplication::applicationName</a>() (otherwise <code>qt_temp</code>) followed by ".XXXXXX". The file is stored in the system's temporary directory, <a href="qdir.html#tempPath">QDir::tempPath</a>().</p>
<p><b>See also </b><a href="qtemporaryfile.html#setFileTemplate">setFileTemplate</a>().</p>
<!-- @@@QTemporaryFile -->
<!-- $$$QTemporaryFile$$$QTemporaryFileconstQString&QObject* -->
<h3 class="fn" id="QTemporaryFile-3"><a name="QTemporaryFile-3"></a>QTemporaryFile::<span class="name">QTemporaryFile</span>(const <span class="type"><a href="qstring.html">QString</a></span> &<i>templateName</i>, <span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>parent</i>)</h3>
<p>Constructs a <a href="qtemporaryfile.html">QTemporaryFile</a> with a template filename of <i>templateName</i> and the specified <i>parent</i>. Upon opening the temporary file this will be used to create a unique filename.</p>
<p>If the <i>templateName</i> does not contain XXXXXX it will automatically be appended and used as the dynamic portion of the filename.</p>
<p>If <i>templateName</i> is a relative path, the path will be relative to the current working directory. You can use <a href="qdir.html#tempPath">QDir::tempPath</a>() to construct <i>templateName</i> if you want use the system's temporary directory.</p>
<p><b>See also </b><a href="qtemporaryfile.html#open">open</a>() and <a href="qtemporaryfile.html#fileTemplate">fileTemplate</a>().</p>
<!-- @@@QTemporaryFile -->
<!-- $$$~QTemporaryFile[overload1]$$$~QTemporaryFile -->
<h3 class="fn" id="dtor.QTemporaryFile"><a name="dtor.QTemporaryFile"></a><code>[virtual] </code>QTemporaryFile::<span class="name">~QTemporaryFile</span>()</h3>
<p>Destroys the temporary file object, the file is automatically closed if necessary and if in auto remove mode it will automatically delete the file.</p>
<p><b>See also </b><a href="qtemporaryfile.html#autoRemove">autoRemove</a>().</p>
<!-- @@@~QTemporaryFile -->
<!-- $$$autoRemove[overload1]$$$autoRemove -->
<h3 class="fn" id="autoRemove"><a name="autoRemove"></a><span class="type">bool</span> QTemporaryFile::<span class="name">autoRemove</span>() const</h3>
<p>Returns <code>true</code> if the <a href="qtemporaryfile.html">QTemporaryFile</a> is in auto remove mode. Auto-remove mode will automatically delete the filename from disk upon destruction. This makes it very easy to create your <a href="qtemporaryfile.html">QTemporaryFile</a> object on the stack, fill it with data, read from it, and finally on function return it will automatically clean up after itself.</p>
<p>Auto-remove is on by default.</p>
<p><b>See also </b><a href="qtemporaryfile.html#setAutoRemove">setAutoRemove</a>() and <a href="qfile.html#remove">remove</a>().</p>
<!-- @@@autoRemove -->
<!-- $$$createNativeFile[overload1]$$$createNativeFileQFile& -->
<h3 class="fn" id="createNativeFile"><a name="createNativeFile"></a><code>[static] </code><span class="type"><a href="qtemporaryfile.html#QTemporaryFile">QTemporaryFile</a></span> *QTemporaryFile::<span class="name">createNativeFile</span>(<span class="type"><a href="qfile.html#QFile">QFile</a></span> &<i>file</i>)</h3>
<p>If <i>file</i> is not already a native file, then a <a href="qtemporaryfile.html">QTemporaryFile</a> is created in <a href="qdir.html#tempPath">QDir::tempPath</a>(), the contents of <i>file</i> is copied into it, and a pointer to the temporary file is returned. Does nothing and returns <code>0</code> if <i>file</i> is already a native file.</p>
<p>For example:</p>
<pre class="cpp">
<span class="type"><a href="qfile.html#QFile">QFile</a></span> f(<span class="string">":/resources/file.txt"</span>);
<span class="type"><a href="qtemporaryfile.html#QTemporaryFile">QTemporaryFile</a></span><span class="operator">::</span>createNativeFile(f); <span class="comment">// Returns a pointer to a temporary file</span>
<span class="type"><a href="qfile.html#QFile">QFile</a></span> f(<span class="string">"/users/qt/file.txt"</span>);
<span class="type"><a href="qtemporaryfile.html#QTemporaryFile">QTemporaryFile</a></span><span class="operator">::</span>createNativeFile(f); <span class="comment">// Returns 0</span>
</pre>
<p><b>See also </b><a href="qfileinfo.html#isNativePath">QFileInfo::isNativePath</a>().</p>
<!-- @@@createNativeFile -->
<!-- $$$createNativeFile$$$createNativeFileconstQString& -->
<h3 class="fn" id="createNativeFile-1"><a name="createNativeFile-1"></a><code>[static] </code><span class="type"><a href="qtemporaryfile.html#QTemporaryFile">QTemporaryFile</a></span> *QTemporaryFile::<span class="name">createNativeFile</span>(const <span class="type"><a href="qstring.html">QString</a></span> &<i>fileName</i>)</h3>
<p>This is an overloaded function.</p>
<p>Works on the given <i>fileName</i> rather than an existing <a href="qfile.html">QFile</a> object.</p>
<!-- @@@createNativeFile -->
<!-- $$$fileName[overload1]$$$fileName -->
<h3 class="fn" id="fileName"><a name="fileName"></a><code>[override virtual] </code><span class="type"><a href="qstring.html">QString</a></span> QTemporaryFile::<span class="name">fileName</span>() const</h3>
<p>Reimplemented from <a href="qfile.html#fileName">QFile::fileName</a>().</p>
<p>Returns the complete unique filename backing the <a href="qtemporaryfile.html">QTemporaryFile</a> object. This string is null before the <a href="qtemporaryfile.html">QTemporaryFile</a> is opened, afterwards it will contain the <a href="qtemporaryfile.html#fileTemplate">fileTemplate</a>() plus additional characters to make it unique.</p>
<p><b>See also </b><a href="qtemporaryfile.html#fileTemplate">fileTemplate</a>().</p>
<!-- @@@fileName -->
<!-- $$$fileTemplate[overload1]$$$fileTemplate -->
<h3 class="fn" id="fileTemplate"><a name="fileTemplate"></a><span class="type"><a href="qstring.html">QString</a></span> QTemporaryFile::<span class="name">fileTemplate</span>() const</h3>
<p>Returns the set file template. The default file template will be called qcoreappname.XXXXXX and be placed in <a href="qdir.html#tempPath">QDir::tempPath</a>().</p>
<p><b>See also </b><a href="qtemporaryfile.html#setFileTemplate">setFileTemplate</a>().</p>
<!-- @@@fileTemplate -->
<!-- $$$open[overload1]$$$open -->
<h3 class="fn" id="open"><a name="open"></a><span class="type">bool</span> QTemporaryFile::<span class="name">open</span>()</h3>
<p>A <a href="qtemporaryfile.html">QTemporaryFile</a> will always be opened in <a href="qiodevice.html#OpenModeFlag-enum">QIODevice::ReadWrite</a> mode, this allows easy access to the data in the file. This function will return true upon success and will set the <a href="qtemporaryfile.html#fileName">fileName</a>() to the unique filename used.</p>
<p><b>See also </b><a href="qtemporaryfile.html#fileName">fileName</a>().</p>
<!-- @@@open -->
<!-- $$$open$$$openQIODevice::OpenMode -->
<h3 class="fn" id="open-1"><a name="open-1"></a><code>[override virtual protected] </code><span class="type">bool</span> QTemporaryFile::<span class="name">open</span>(<span class="type"><a href="qiodevice.html#OpenModeFlag-enum">QIODevice::OpenMode</a></span> <i>flags</i>)</h3>
<p>Reimplemented from <a href="qfile.html#open">QFile::open</a>().</p>
<p>Creates a unique file name for the temporary file, and opens it. You can get the unique name later by calling <a href="qtemporaryfile.html#fileName">fileName</a>(). The file is guaranteed to have been created by this function (i.e., it has never existed before).</p>
<!-- @@@open -->
<!-- $$$setAutoRemove[overload1]$$$setAutoRemovebool -->
<h3 class="fn" id="setAutoRemove"><a name="setAutoRemove"></a><span class="type">void</span> QTemporaryFile::<span class="name">setAutoRemove</span>(<span class="type">bool</span> <i>b</i>)</h3>
<p>Sets the <a href="qtemporaryfile.html">QTemporaryFile</a> into auto-remove mode if <i>b</i> is <code>true</code>.</p>
<p>Auto-remove is on by default.</p>
<p>If you set this property to <code>false</code>, ensure the application provides a way to remove the file once it is no longer needed, including passing the responsibility on to another process. Always use the <a href="qtemporaryfile.html#fileName">fileName</a>() function to obtain the name and never try to guess the name that <a href="qtemporaryfile.html">QTemporaryFile</a> has generated.</p>
<p>On some systems, if <a href="qtemporaryfile.html#fileName">fileName</a>() is not called before closing the file, the temporary file may be removed regardless of the state of this property. This behavior should not be relied upon, so application code should either call <a href="qtemporaryfile.html#fileName">fileName</a>() or leave the auto removal functionality enabled.</p>
<p><b>See also </b><a href="qtemporaryfile.html#autoRemove">autoRemove</a>() and <a href="qfile.html#remove">remove</a>().</p>
<!-- @@@setAutoRemove -->
<!-- $$$setFileTemplate[overload1]$$$setFileTemplateconstQString& -->
<h3 class="fn" id="setFileTemplate"><a name="setFileTemplate"></a><span class="type">void</span> QTemporaryFile::<span class="name">setFileTemplate</span>(const <span class="type"><a href="qstring.html">QString</a></span> &<i>name</i>)</h3>
<p>Sets the static portion of the file name to <i>name</i>. If the file template contains XXXXXX that will automatically be replaced with the unique part of the filename, otherwise a filename will be determined automatically based on the static portion specified.</p>
<p>If <i>name</i> contains a relative file path, the path will be relative to the current working directory. You can use <a href="qdir.html#tempPath">QDir::tempPath</a>() to construct <i>name</i> if you want use the system's temporary directory.</p>
<p><b>See also </b><a href="qtemporaryfile.html#fileTemplate">fileTemplate</a>().</p>
<!-- @@@setFileTemplate -->
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