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<title>Qt 4.6: Qt 3 Support Members for QSettings</title>
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<td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td>
<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">Qt 3 Support Members for QSettings</h1>
<p><b>The following class members are part of the <a href="qt3support.html">Qt 3 support layer</a>.</b> They are provided to help you port old code to Qt 4. We advise against using them in new code.</p>
<p><ul><li><a href="qsettings.html">QSettings class reference</a></li></ul></p>
<h2>Public Types</h2>
<table class="alignedsummary" border="0" cellpadding="0" cellspacing="0" width="100%">
<tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#System-enum">System</a></b> { Unix, Windows, Mac }</td></tr>
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<h2>Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">QStringList </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#entryList">entryList</a></b> ( const QString & <i>key</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#insertSearchPath">insertSearchPath</a></b> ( System <i>system</i>, const QString & <i>path</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#readBoolEntry">readBoolEntry</a></b> ( const QString & <i>key</i>, bool <i>defaultValue</i> = false, bool * <i>ok</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#readDoubleEntry">readDoubleEntry</a></b> ( const QString & <i>key</i>, double <i>defaultValue</i> = 0, bool * <i>ok</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QString </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#readEntry">readEntry</a></b> ( const QString & <i>key</i>, const QString & <i>defaultValue</i> = QString(), bool * <i>ok</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QStringList </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#readListEntry">readListEntry</a></b> ( const QString & <i>key</i>, bool * <i>ok</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QStringList </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#readListEntry-2">readListEntry</a></b> ( const QString & <i>key</i>, QChar <i>separator</i>, bool * <i>ok</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#readNumEntry">readNumEntry</a></b> ( const QString & <i>key</i>, int <i>defaultValue</i> = 0, bool * <i>ok</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#removeEntry">removeEntry</a></b> ( const QString & <i>key</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#removeSearchPath">removeSearchPath</a></b> ( System <i>system</i>, const QString & <i>path</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#resetGroup">resetGroup</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#setPath-2">setPath</a></b> ( const QString & <i>organization</i>, const QString & <i>application</i>, Scope <i>scope</i> = Global )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QStringList </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#subkeyList">subkeyList</a></b> ( const QString & <i>key</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#writeEntry">writeEntry</a></b> ( const QString & <i>key</i>, bool <i>value</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#writeEntry-2">writeEntry</a></b> ( const QString & <i>key</i>, double <i>value</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#writeEntry-3">writeEntry</a></b> ( const QString & <i>key</i>, int <i>value</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#writeEntry-4">writeEntry</a></b> ( const QString & <i>key</i>, const char * <i>value</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#writeEntry-5">writeEntry</a></b> ( const QString & <i>key</i>, const QString & <i>value</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#writeEntry-6">writeEntry</a></b> ( const QString & <i>key</i>, const QStringList & <i>value</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qsettings-qt3.html#writeEntry-7">writeEntry</a></b> ( const QString & <i>key</i>, const QStringList & <i>value</i>, QChar <i>separator</i> )</td></tr>
</table>
<ul>
<li><div bar="2" class="fn"></div>8 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
</ul>
<hr />
<h2>Member Type Documentation</h2>
<a name="//apple_ref/cpp/tag/QSettings/System"></a>
<a name="//apple_ref/cpp/econst/QSettings/Unix"></a>
<a name="//apple_ref/cpp/econst/QSettings/Windows"></a>
<a name="//apple_ref/cpp/econst/QSettings/Mac"></a>
<h3 class="fn"><a name="System-enum"></a>enum QSettings::System</h3>
<p><table class="valuelist" border="1" cellpadding="2" cellspacing="1" width="100%">
<tr><th width="25%">Constant</th><th width="15%">Value</th><th width="60%">Description</th></tr>
<tr><td valign="top"><tt>QSettings::Unix</tt></td><td align="center" valign="top"><tt>0</tt></td><td valign="top">Unix systems (X11 and Embedded Linux)</td></tr>
<tr><td valign="top"><tt>QSettings::Windows</tt></td><td align="center" valign="top"><tt>1</tt></td><td valign="top">Microsoft Windows systems</td></tr>
<tr><td valign="top"><tt>QSettings::Mac</tt></td><td align="center" valign="top"><tt>2</tt></td><td valign="top">Mac OS X systems</td></tr>
</table></p>
<p>See also <a href="qsettings-qt3.html#insertSearchPath">insertSearchPath</a>() and <a href="qsettings-qt3.html#removeSearchPath">removeSearchPath</a>().</p>
<hr />
<h2>Member Function Documentation</h2>
<a name="//apple_ref/cpp/instm/QSettings/entryList"></a>
<h3 class="fn"><a name="entryList"></a><a href="qstringlist.html">QStringList</a> QSettings::entryList ( const <a href="qstring.html">QString</a> & <i>key</i> ) const</h3>
<p>Returns a list of all sub-keys of <i>key</i>.</p>
<p>Use <a href="qsettings.html#childKeys">childKeys</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> QSettings settings;
QStringList keys = settings.entryList("cities");
...</font></pre>
<p>you can rewrite it as</p>
<pre> QSettings settings;
settings.beginGroup("cities");
QStringList keys = settings.childKeys();
...
settings.endGroup();</pre>
<a name="//apple_ref/cpp/instm/QSettings/insertSearchPath"></a>
<h3 class="fn"><a name="insertSearchPath"></a>void QSettings::insertSearchPath ( <a href="qsettings-qt3.html#System-enum">System</a> <i>system</i>, const <a href="qstring.html">QString</a> & <i>path</i> )</h3>
<p>This function is implemented as a no-op. It is provided for source compatibility with Qt 3. The new <a href="qsettings.html">QSettings</a> class has no concept of "search path".</p>
<a name="//apple_ref/cpp/instm/QSettings/readBoolEntry"></a>
<h3 class="fn"><a name="readBoolEntry"></a>bool QSettings::readBoolEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, bool <i>defaultValue</i> = false, bool * <i>ok</i> = 0 )</h3>
<p>Returns the value for setting <i>key</i> converted to a <tt>bool</tt>. If the setting doesn't exist, returns <i>defaultValue</i>.</p>
<p>If <i>ok</i> is not 0, *<i>ok</i> is set to true if the key exists, otherwise *<i>ok</i> is set to false.</p>
<p>Use <a href="qsettings.html#value">value</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> bool ok;
bool grid = settings.readBoolEntry("showGrid", true, &ok);</font></pre>
<p>you can rewrite it as</p>
<pre> bool ok = settings.contains("showGrid");
bool grid = settings.value("showGrid", true).toBool();</pre>
<a name="//apple_ref/cpp/instm/QSettings/readDoubleEntry"></a>
<h3 class="fn"><a name="readDoubleEntry"></a>double QSettings::readDoubleEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, double <i>defaultValue</i> = 0, bool * <i>ok</i> = 0 )</h3>
<p>Returns the value for setting <i>key</i> converted to a <tt>double</tt>. If the setting doesn't exist, returns <i>defaultValue</i>.</p>
<p>If <i>ok</i> is not 0, *<i>ok</i> is set to true if the key exists, otherwise *<i>ok</i> is set to false.</p>
<p>Use <a href="qsettings.html#value">value</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> bool ok;
double pi = settings.readDoubleEntry("pi", 3.141592, &ok);</font></pre>
<p>you can rewrite it as</p>
<pre> bool ok = settings.contains("pi");
double pi = settings.value("pi", 3.141592).toDouble();</pre>
<a name="//apple_ref/cpp/instm/QSettings/readEntry"></a>
<h3 class="fn"><a name="readEntry"></a><a href="qstring.html">QString</a> QSettings::readEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, const <a href="qstring.html">QString</a> & <i>defaultValue</i> = QString(), bool * <i>ok</i> = 0 )</h3>
<p>Returns the value for setting <i>key</i> converted to a <a href="qstring.html">QString</a>. If the setting doesn't exist, returns <i>defaultValue</i>.</p>
<p>If <i>ok</i> is not 0, *<i>ok</i> is set to true if the key exists, otherwise *<i>ok</i> is set to false.</p>
<p>Use <a href="qsettings.html#value">value</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> bool ok;
QString str = settings.readEntry("userName", "administrator", &ok);</font></pre>
<p>you can rewrite it as</p>
<pre> bool ok = settings.contains("userName");
QString str = settings.value("userName", "administrator").toString();</pre>
<a name="//apple_ref/cpp/instm/QSettings/readListEntry"></a>
<h3 class="fn"><a name="readListEntry"></a><a href="qstringlist.html">QStringList</a> QSettings::readListEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, bool * <i>ok</i> = 0 )</h3>
<p>Returns the value of setting <i>key</i> converted to a <a href="qstringlist.html">QStringList</a>.</p>
<p>If <i>ok</i> is not 0, *<i>ok</i> is set to true if the key exists, otherwise *<i>ok</i> is set to false.</p>
<p>Use <a href="qsettings.html#value">value</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> bool ok;
QStringList list = settings.readListEntry("recentFiles", &ok);</font></pre>
<p>you can rewrite it as</p>
<pre> bool ok = settings.contains("recentFiles");
QStringList list = settings.value("recentFiles").toStringList();</pre>
<h3 class="fn"><a name="readListEntry-2"></a><a href="qstringlist.html">QStringList</a> QSettings::readListEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, <a href="qchar.html">QChar</a> <i>separator</i>, bool * <i>ok</i> = 0 )</h3>
<p>Returns the value of setting <i>key</i> converted to a <a href="qstringlist.html">QStringList</a>. <i>separator</i> is ignored.</p>
<p>If <i>ok</i> is not 0, *<i>ok</i> is set to true if the key exists, otherwise *<i>ok</i> is set to false.</p>
<p>Use <a href="qsettings.html#value">value</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> bool ok;
QStringList list = settings.readListEntry("recentFiles", ":", &ok);</font></pre>
<p>you can rewrite it as</p>
<pre> bool ok = settings.contains("recentFiles");
QStringList list = settings.value("recentFiles").toStringList();</pre>
<a name="//apple_ref/cpp/instm/QSettings/readNumEntry"></a>
<h3 class="fn"><a name="readNumEntry"></a>int QSettings::readNumEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, int <i>defaultValue</i> = 0, bool * <i>ok</i> = 0 )</h3>
<p>Returns the value for setting <i>key</i> converted to an <tt>int</tt>. If the setting doesn't exist, returns <i>defaultValue</i>.</p>
<p>If <i>ok</i> is not 0, *<i>ok</i> is set to true if the key exists, otherwise *<i>ok</i> is set to false.</p>
<p>Use <a href="qsettings.html#value">value</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> bool ok;
int max = settings.readNumEntry("maxConnections", 30, &ok);</font></pre>
<p>you can rewrite it as</p>
<pre> bool ok = settings.contains("maxConnections");
int max = settings.value("maxConnections", 30).toInt();</pre>
<a name="//apple_ref/cpp/instm/QSettings/removeEntry"></a>
<h3 class="fn"><a name="removeEntry"></a>bool QSettings::removeEntry ( const <a href="qstring.html">QString</a> & <i>key</i> )</h3>
<p>Use <a href="qsettings.html#remove">remove</a>() instead.</p>
<a name="//apple_ref/cpp/instm/QSettings/removeSearchPath"></a>
<h3 class="fn"><a name="removeSearchPath"></a>void QSettings::removeSearchPath ( <a href="qsettings-qt3.html#System-enum">System</a> <i>system</i>, const <a href="qstring.html">QString</a> & <i>path</i> )</h3>
<p>This function is implemented as a no-op. It is provided for source compatibility with Qt 3. The new <a href="qsettings.html">QSettings</a> class has no concept of "search path".</p>
<a name="//apple_ref/cpp/instm/QSettings/resetGroup"></a>
<h3 class="fn"><a name="resetGroup"></a>void QSettings::resetGroup ()</h3>
<p>Sets the current group to be the empty string.</p>
<p>Use <a href="qsettings.html#endGroup">endGroup</a>() instead (possibly multiple times).</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> QSettings settings;
settings.beginGroup("mainWindow");
settings.beginGroup("leftPanel");
...
settings.resetGroup();</font></pre>
<p>you can rewrite it as</p>
<pre> QSettings settings;
settings.beginGroup("mainWindow");
settings.beginGroup("leftPanel");
...
settings.endGroup();
settings.endGroup();</pre>
<h3 class="fn"><a name="setPath-2"></a>void QSettings::setPath ( const <a href="qstring.html">QString</a> & <i>organization</i>, const <a href="qstring.html">QString</a> & <i>application</i>, <a href="qsettings.html#Scope-enum">Scope</a> <i>scope</i> = Global )</h3>
<p>Specifies the <i>organization</i>, <i>application</i>, and <i>scope</i> to use by the <a href="qsettings.html">QSettings</a> object.</p>
<p>Use the appropriate constructor instead, with <a href="qsettings.html#Scope-enum">QSettings::UserScope</a> instead of <a href="qsettings.html#Scope-enum">QSettings::User</a> and <a href="qsettings.html#Scope-enum">QSettings::SystemScope</a> instead of <a href="qsettings.html#Scope-enum">QSettings::Global</a>.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> QSettings settings;
settings.setPath("twikimaster.com", "Kanooth", QSettings::Global);</font></pre>
<p>you can rewrite it as</p>
<pre> QSettings settings(QSettings::SystemScope, "twikimaster.com", "Kanooth");</pre>
<a name="//apple_ref/cpp/instm/QSettings/subkeyList"></a>
<h3 class="fn"><a name="subkeyList"></a><a href="qstringlist.html">QStringList</a> QSettings::subkeyList ( const <a href="qstring.html">QString</a> & <i>key</i> ) const</h3>
<p>Returns a list of all sub-keys of <i>key</i>.</p>
<p>Use <a href="qsettings.html#childGroups">childGroups</a>() instead.</p>
<p>For example, if you have code like</p>
<pre><font color="#404040"> QSettings settings;
QStringList groups = settings.entryList("cities");
...</font></pre>
<p>you can rewrite it as</p>
<pre> QSettings settings;
settings.beginGroup("cities");
QStringList groups = settings.childKeys();
...
settings.endGroup();</pre>
<a name="//apple_ref/cpp/instm/QSettings/writeEntry"></a>
<h3 class="fn"><a name="writeEntry"></a>bool QSettings::writeEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, bool <i>value</i> )</h3>
<p>Sets the value of setting <i>key</i> to <i>value</i>.</p>
<p>Use <a href="qsettings.html#setValue">setValue</a>() instead.</p>
<h3 class="fn"><a name="writeEntry-2"></a>bool QSettings::writeEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, double <i>value</i> )</h3>
<p>This is an overloaded function.</p>
<h3 class="fn"><a name="writeEntry-3"></a>bool QSettings::writeEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, int <i>value</i> )</h3>
<p>This is an overloaded function.</p>
<h3 class="fn"><a name="writeEntry-4"></a>bool QSettings::writeEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, const char * <i>value</i> )</h3>
<p>This is an overloaded function.</p>
<h3 class="fn"><a name="writeEntry-5"></a>bool QSettings::writeEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, const <a href="qstring.html">QString</a> & <i>value</i> )</h3>
<p>This is an overloaded function.</p>
<h3 class="fn"><a name="writeEntry-6"></a>bool QSettings::writeEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, const <a href="qstringlist.html">QStringList</a> & <i>value</i> )</h3>
<p>This is an overloaded function.</p>
<h3 class="fn"><a name="writeEntry-7"></a>bool QSettings::writeEntry ( const <a href="qstring.html">QString</a> & <i>key</i>, const <a href="qstringlist.html">QStringList</a> & <i>value</i>, <a href="qchar.html">QChar</a> <i>separator</i> )</h3>
<p>This is an overloaded function.</p>
<p>Use setValue(<i>key</i>, <i>value</i>) instead. You don't need <i>separator</i>.</p>
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<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>
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