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627 lines
36 KiB
627 lines
36 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/tools/qsettings.cpp:67 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQSettings Class</title>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQSettings Class Reference</h1>
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<p>The TQSettings class provides persistent platform-independent application settings.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsettings-h.html">ntqsettings.h</a>></tt>
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<p><a href="qsettings-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>enum <a href="#Format-enum"><b>Format</b></a> { Native = 0, Ini }</li>
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<li class=fn>enum <a href="#System-enum"><b>System</b></a> { Unix = 0, Windows, Mac }</li>
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<li class=fn>enum <a href="#Scope-enum"><b>Scope</b></a> { User, Global }</li>
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<li class=fn><a href="#TQSettings"><b>TQSettings</b></a> ()</li>
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<li class=fn><a href="#TQSettings-2"><b>TQSettings</b></a> ( Format format )</li>
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<li class=fn><a href="#~TQSettings"><b>~TQSettings</b></a> ()</li>
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<li class=fn>bool <a href="#writeEntry"><b>writeEntry</b></a> ( const TQString & key, bool value )</li>
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<li class=fn>bool <a href="#writeEntry-2"><b>writeEntry</b></a> ( const TQString & key, double value )</li>
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<li class=fn>bool <a href="#writeEntry-3"><b>writeEntry</b></a> ( const TQString & key, int value )</li>
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<li class=fn>bool <a href="#writeEntry-5"><b>writeEntry</b></a> ( const TQString & key, const TQString & value )</li>
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<li class=fn>bool <a href="#writeEntry-6"><b>writeEntry</b></a> ( const TQString & key, const TQStringList & value )</li>
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<li class=fn>bool writeEntry ( const TQString & key, const TQStringList & value, const TQChar & separator ) <em>(obsolete)</em></li>
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<li class=fn>TQStringList <a href="#entryList"><b>entryList</b></a> ( const TQString & key ) const</li>
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<li class=fn>TQStringList <a href="#subkeyList"><b>subkeyList</b></a> ( const TQString & key ) const</li>
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<li class=fn>TQStringList <a href="#readListEntry"><b>readListEntry</b></a> ( const TQString & key, bool * ok = 0 ) const</li>
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<li class=fn>TQStringList readListEntry ( const TQString & key, const TQChar & separator, bool * ok = 0 ) const <em>(obsolete)</em></li>
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<li class=fn>TQString <a href="#readEntry"><b>readEntry</b></a> ( const TQString & key, const TQString & def = TQString::null, bool * ok = 0 ) const</li>
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<li class=fn>int <a href="#readNumEntry"><b>readNumEntry</b></a> ( const TQString & key, int def = 0, bool * ok = 0 ) const</li>
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<li class=fn>double <a href="#readDoubleEntry"><b>readDoubleEntry</b></a> ( const TQString & key, double def = 0, bool * ok = 0 ) const</li>
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<li class=fn>bool <a href="#readBoolEntry"><b>readBoolEntry</b></a> ( const TQString & key, bool def = FALSE, bool * ok = 0 ) const</li>
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<li class=fn>bool <a href="#removeEntry"><b>removeEntry</b></a> ( const TQString & key )</li>
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<li class=fn>void <a href="#insertSearchPath"><b>insertSearchPath</b></a> ( System s, const TQString & path )</li>
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<li class=fn>void <a href="#removeSearchPath"><b>removeSearchPath</b></a> ( System s, const TQString & path )</li>
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<li class=fn>void <a href="#setPath"><b>setPath</b></a> ( const TQString & domain, const TQString & product, Scope scope = Global )</li>
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<li class=fn>void <a href="#beginGroup"><b>beginGroup</b></a> ( const TQString & group )</li>
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<li class=fn>void <a href="#endGroup"><b>endGroup</b></a> ()</li>
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<li class=fn>void <a href="#resetGroup"><b>resetGroup</b></a> ()</li>
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<li class=fn>TQString <a href="#group"><b>group</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQSettings class provides persistent platform-independent application settings.
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<p>
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<p> On Unix systems, TQSettings uses text files to store settings. On Windows
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systems, TQSettings uses the system registry. On Mac OS X, TQSettings uses
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the Carbon preferences API.
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<p> Each setting comprises an identifying key and the data associated with
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the key. A key is a unicode string which consists of <em>two</em> or more
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subkeys. A subkey is a slash, '/', followed by one or more unicode
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characters (excluding slashes, newlines, carriage returns and equals,
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'=', signs). The associated data, called the entry or value, may be a
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boolean, an integer, a double, a string or a list of strings. Entry
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strings may contain any unicode characters.
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<p> If you want to save and restore the entire desktop's settings, i.e.
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which applications are running, use TQSettings to save the settings
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for each individual application and <a href="ntqsessionmanager.html">TQSessionManager</a> to save the
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desktop's session.
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<p> Example settings:
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<pre>
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/MyCompany/MyApplication/background color
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/MyCompany/MyApplication/foreground color
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/MyCompany/MyApplication/geometry/x
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/MyCompany/MyApplication/geometry/y
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/MyCompany/MyApplication/geometry/width
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/MyCompany/MyApplication/geometry/height
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/MyCompany/MyApplication/recent files/1
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/MyCompany/MyApplication/recent files/2
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/MyCompany/MyApplication/recent files/3
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</pre>
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Each line above is a complete key, made up of subkeys.
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<p> A typical usage pattern for reading settings at application
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startup:
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<pre>
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TQSettings settings;
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settings.<a href="#setPath">setPath</a>( "MyCompany.com", "MyApplication" );
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<a href="ntqstring.html">TQString</a> bgColor = settings.<a href="#readEntry">readEntry</a>( "/colors/background", "white" );
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int width = settings.<a href="#readNumEntry">readNumEntry</a>( "/geometry/width", 640 );
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// ...
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</pre>
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<p> A typical usage pattern for saving settings at application exit or
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'save preferences':
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<pre>
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TQSettings settings;
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settings.<a href="#setPath">setPath</a>( "MyCompany.com", "MyApplication" );
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settings.<a href="#writeEntry">writeEntry</a>( "/colors/background", bgColor );
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settings.<a href="#writeEntry">writeEntry</a>( "/geometry/width", width );
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// ...
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</pre>
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<p> A key prefix can be prepended to all keys using <a href="#beginGroup">beginGroup</a>(). The
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application of the prefix is stopped using <a href="#endGroup">endGroup</a>(). For
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example:
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<pre>
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TQSettings settings;
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settings.<a href="#beginGroup">beginGroup</a>( "/MainWindow" );
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settings.<a href="#beginGroup">beginGroup</a>( "/Geometry" );
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int x = settings.<a href="#readEntry">readEntry</a>( "/x" );
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// ...
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settings.<a href="#endGroup">endGroup</a>();
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settings.<a href="#beginGroup">beginGroup</a>( "/Toolbars" );
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// ...
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settings.<a href="#endGroup">endGroup</a>();
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settings.<a href="#endGroup">endGroup</a>();
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</pre>
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<p> You can get a list of entry-holding keys by calling <a href="#entryList">entryList</a>(), and
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a list of key-holding keys using <a href="#subkeyList">subkeyList</a>().
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<p> <pre>
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<a href="ntqstringlist.html">TQStringList</a> keys = settings.entryList( "/MyApplication" );
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// keys contains 'background color' and 'foreground color'.
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<a href="ntqstringlist.html">TQStringList</a> keys = settings.entryList( "/MyApplication/recent files" );
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// keys contains '1', '2' and '3'.
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<a href="ntqstringlist.html">TQStringList</a> subkeys = settings.subkeyList( "/MyApplication" );
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// subkeys contains 'geometry' and 'recent files'
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<a href="ntqstringlist.html">TQStringList</a> subkeys = settings.subkeyList( "/MyApplication/recent files" );
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// subkeys is empty.
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</pre>
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<p> Since settings for Windows are stored in the registry there are
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some size limitations as follows:
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<ul>
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<li> A subkey may not exceed 255 characters.
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<li> An entry's value may not exceed 16,300 characters.
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<li> All the values of a key (for example, all the 'recent files'
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subkeys values), may not exceed 65,535 characters.
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</ul>
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<p> These limitations are not enforced on Unix or Mac OS X.
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<p> <b>Warning:</b> Creating multiple, simultaneous instances of TQSettings writing
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to a text file may lead to data loss! This is a known issue which will
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be fixed in a future release of TQt.
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<p> <h3> Notes for Mac OS X Applications
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</h3>
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<a name="1"></a><p> The location where settings are stored is not formally defined by
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the CFPreferences API.
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<p> At the time of writing settings are stored (either on a global or
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user basis, preferring locally) into a plist file in <tt>$ROOT/System/Library/Preferences</tt> (in XML format). TQSettings will
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create an appropriate plist file (<tt>com.<first group name>.plist</tt>)
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out of the full path to a key.
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<p> For further information on CFPreferences see
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<a href="http://developer.apple.com/documentation/CoreFoundation/Conceptual/CFPreferences/index.html">Apple's Specifications</a>
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<p> <h3> Notes for Unix Applications
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</h3>
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<a name="1-1"></a><p> There is no universally accepted place for storing application
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settings under Unix. In the examples the settings file will be
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searched for in the following directories:
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<ol type=1>
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<li> <tt>SYSCONF</tt> - the default value is <tt>INSTALL/etc/settings</tt>
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<li> <tt>/opt/MyCompany/share/etc</tt>
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<li> <tt>/opt/MyCompany/share/MyApplication/etc</tt>
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<li> <tt>$HOME/.qt</tt>
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</ol>
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When reading settings the files are searched in the order shown
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above, with later settings overriding earlier settings. Files for
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which the user doesn't have read permission are ignored. When saving
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settings TQSettings works in the order shown above, writing
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to the first settings file for which the user has write permission.
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(<tt>INSTALL</tt> is the directory where TQt was installed. This can be
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modified by using the configure script's -prefix argument )
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<p> If you want to put the settings in a particular place in the
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filesystem you could do this:
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<pre>
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settings.insertSearchPath( TQSettings::<a href="#System-enum">Unix</a>, "/opt/MyCompany/share" );
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</pre>
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<p> But in practice you may prefer not to use a search path for Unix.
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For example the following code:
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<pre>
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settings.writeEntry( "/MyApplication/geometry/width", width );
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</pre>
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will end up writing the "geometry/width" setting to the file
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<tt>$HOME/.qt/myapplicationrc</tt> (assuming that the application is
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being run by an ordinary user, i.e. not by root).
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<p> For cross-platform applications you should ensure that the
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<a href="#sizelimit">Windows size limitations</a> are not exceeded.
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<p> <b>Warning:</b> TQSettings doesn't write the settings until it is destroyed so
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you should construct the TQSettings object on the stack.
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<p>See also <a href="io.html">Input/Output and Networking</a> and <a href="misc.html">Miscellaneous Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="Format-enum"></a>TQSettings::Format</h3>
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<ul>
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<li><tt>TQSettings::Native</tt> - Store the settings in a platform dependent location
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<li><tt>TQSettings::Ini</tt> - Store the settings in a text file
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</ul>
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<h3 class=fn><a name="Scope-enum"></a>TQSettings::Scope</h3>
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<ul>
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<li><tt>TQSettings::Global</tt> - Save settings as global as possible
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<li><tt>TQSettings::User</tt> - Save settings in user space
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</ul>
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<h3 class=fn><a name="System-enum"></a>TQSettings::System</h3>
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<ul>
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<li><tt>TQSettings::Mac</tt> - Macintosh execution environments
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<li><tt>TQSettings::Unix</tt> - Mac OS X, Unix, Linux and Unix-like execution environments
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<li><tt>TQSettings::Windows</tt> - Windows execution environments
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQSettings"></a>TQSettings::TQSettings ()
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</h3>
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Creates a settings object.
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<p> Be aware that you must call <a href="#setPath">setPath</a>() or <a href="#insertSearchPath">insertSearchPath</a>() before
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you can use the TQSettings object.
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<h3 class=fn><a name="TQSettings-2"></a>TQSettings::TQSettings ( <a href="ntqsettings.html#Format-enum">Format</a> format )
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</h3>
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Creates a settings object. If <em>format</em> is 'Ini' the settings will
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be stored in a text file, using the Unix strategy (see above). If <em>format</em>
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is 'Native', the settings will be stored in a platform specific way
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(ie. the Windows registry).
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<p> Be aware that you must call <a href="#setPath">setPath</a>() or <a href="#insertSearchPath">insertSearchPath</a>() before
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you can use the TQSettings object.
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<h3 class=fn><a name="~TQSettings"></a>TQSettings::~TQSettings ()
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</h3>
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Destroys the settings object. All modifications made to the settings
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will automatically be saved.
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<p>
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<h3 class=fn>void <a name="beginGroup"></a>TQSettings::beginGroup ( const <a href="ntqstring.html">TQString</a> & group )
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</h3>
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Appends <em>group</em> to the current key prefix.
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<p> <pre>
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TQSettings settings;
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settings.<a href="#beginGroup">beginGroup</a>( "/MainWindow" );
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// read values
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settings.<a href="#endGroup">endGroup</a>();
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</pre>
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<h3 class=fn>void <a name="endGroup"></a>TQSettings::endGroup ()
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</h3>
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Undo previous calls to <a href="#beginGroup">beginGroup</a>(). Note that a single beginGroup("a/b/c") is undone
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by a single call to <a href="#endGroup">endGroup</a>().
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<p> <pre>
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TQSettings settings;
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settings.<a href="#beginGroup">beginGroup</a>( "/MainWindow/Geometry" );
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|
|
// read values
|
||
|
|
settings.<a href="#endGroup">endGroup</a>();
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="entryList"></a>TQSettings::entryList ( const <a href="ntqstring.html">TQString</a> & key ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns a list of the keys which contain entries under <em>key</em>. Does <em>not</em> return any keys that contain subkeys.
|
||
|
|
<p> Example settings:
|
||
|
|
<pre>
|
||
|
|
/MyCompany/MyApplication/background color
|
||
|
|
/MyCompany/MyApplication/foreground color
|
||
|
|
/MyCompany/MyApplication/geometry/x
|
||
|
|
/MyCompany/MyApplication/geometry/y
|
||
|
|
/MyCompany/MyApplication/geometry/width
|
||
|
|
/MyCompany/MyApplication/geometry/height
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<pre>
|
||
|
13 years ago
|
<a href="ntqstringlist.html">TQStringList</a> keys = settings.entryList( "/MyCompany/MyApplication" );
|
||
|
13 years ago
|
</pre>
|
||
|
|
|
||
|
|
<p> In the above example, <tt>keys</tt> will contain 'background color' and
|
||
|
|
'foreground color'. It will not contain 'geometry' because this key
|
||
|
|
contains subkeys not entries.
|
||
|
|
<p> To access the geometry values, you could either use <a href="#subkeyList">subkeyList</a>()
|
||
|
|
to read the keys then read each entry, or simply read each entry
|
||
|
|
directly by specifying its full key, e.g.
|
||
|
|
"/MyCompany/MyApplication/geometry/y".
|
||
|
|
<p> <p>See also <a href="#subkeyList">subkeyList</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="group"></a>TQSettings::group () const
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns the current key prefix, or a null string if there is no key prefix set.
|
||
|
|
<p> <p>See also <a href="#beginGroup">beginGroup</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="insertSearchPath"></a>TQSettings::insertSearchPath ( <a href="ntqsettings.html#System-enum">System</a> s, const <a href="ntqstring.html">TQString</a> & path )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Inserts <em>path</em> into the settings search path. The semantics of <em>path</em> depends on the system <em>s</em>. It is usually easier and better to
|
||
|
|
use <a href="#setPath">setPath</a>() instead of this function.
|
||
|
|
<p> When <em>s</em> is <em>Windows</em> and the execution environment is <em>not</em>
|
||
|
|
Windows the function does nothing. Similarly when <em>s</em> is <em>Unix</em> and
|
||
|
|
the execution environment is <em>not</em> Unix the function does nothing.
|
||
|
|
<p> When <em>s</em> is <em>Windows</em>, and the execution environment is Windows, the
|
||
|
|
search path list will be used as the first subfolder of the "Software"
|
||
|
|
folder in the registry.
|
||
|
|
<p> When reading settings the folders are searched forwards from the
|
||
|
|
first folder (listed below) to the last, returning the first
|
||
|
|
settings found, and ignoring any folders for which the user doesn't
|
||
|
|
have read permission.
|
||
|
|
<ol type=1>
|
||
|
|
<li> HKEY_CURRENT_USER/Software/MyCompany/MyApplication
|
||
|
|
<li> HKEY_LOCAL_MACHINE/Software/MyCompany/MyApplication
|
||
|
|
<li> HKEY_CURRENT_USER/Software/MyApplication
|
||
|
|
<li> HKEY_LOCAL_MACHINE/Software/MyApplication
|
||
|
|
</ol>
|
||
|
|
<p> <pre>
|
||
|
|
TQSettings settings;
|
||
|
|
settings.<a href="#insertSearchPath">insertSearchPath</a>( TQSettings::<a href="#System-enum">Windows</a>, "/MyCompany" );
|
||
|
|
settings.<a href="#writeEntry">writeEntry</a>( "/MyApplication/Tip of the day", TRUE );
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
The code above will write the subkey "Tip of the day" into the <em>first</em> of the registry folders listed below that is found and for
|
||
|
|
which the user has write permission.
|
||
|
|
<ol type=1>
|
||
|
|
<li> HKEY_LOCAL_MACHINE/Software/MyCompany/MyApplication
|
||
|
|
<li> HKEY_CURRENT_USER/Software/MyCompany/MyApplication
|
||
|
|
<li> HKEY_LOCAL_MACHINE/Software/MyApplication
|
||
|
|
<li> HKEY_CURRENT_USER/Software/MyApplication
|
||
|
|
</ol>
|
||
|
|
If a setting is found in the HKEY_CURRENT_USER space, this setting
|
||
|
|
is overwritten independently of write permissions in the
|
||
|
|
HKEY_LOCAL_MACHINE space.
|
||
|
|
<p> When <em>s</em> is <em>Unix</em>, and the execution environment is Unix, the
|
||
|
|
search path list will be used when trying to determine a suitable
|
||
|
|
filename for reading and writing settings files. By default, there are
|
||
|
|
two entries in the search path:
|
||
|
|
<p> <ol type=1>
|
||
|
|
<li> <tt>SYSCONF</tt> - where <tt>SYSCONF</tt> is a directory specified when
|
||
|
|
configuring TQt; by default it is INSTALL/etc/settings.
|
||
|
|
<li> <tt>$HOME/.qt/</tt> - where <tt>$HOME</tt> is the user's home directory.
|
||
|
|
</ol>
|
||
|
|
<p> All insertions into the search path will go before $HOME/.qt/.
|
||
|
|
For example:
|
||
|
|
<pre>
|
||
|
|
TQSettings settings;
|
||
|
|
settings.<a href="#insertSearchPath">insertSearchPath</a>( TQSettings::<a href="#System-enum">Unix</a>, "/opt/MyCompany/share/etc" );
|
||
|
|
settings.<a href="#insertSearchPath">insertSearchPath</a>( TQSettings::<a href="#System-enum">Unix</a>, "/opt/MyCompany/share/MyApplication/etc" );
|
||
|
|
// ...
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
Will result in a search path of:
|
||
|
|
<ol type=1>
|
||
|
|
<li> SYSCONF
|
||
|
|
<li> /opt/MyCompany/share/etc
|
||
|
|
<li> /opt/MyCompany/share/MyApplication/etc
|
||
|
|
<li> $HOME/.qt
|
||
|
|
</ol>
|
||
|
|
When reading settings the files are searched in the order shown
|
||
|
|
above, with later settings overriding earlier settings. Files for
|
||
|
|
which the user doesn't have read permission are ignored. When saving
|
||
|
|
settings TQSettings works in the order shown above, writing
|
||
|
|
to the first settings file for which the user has write permission.
|
||
|
|
<p> Note that paths in the file system are not created by this
|
||
|
|
function, so they must already exist to be useful.
|
||
|
|
<p> Settings under Unix are stored in files whose names are based on the
|
||
|
|
first subkey of the key (not including the search path). The algorithm
|
||
|
|
for creating names is essentially: lowercase the first subkey, replace
|
||
|
|
spaces with underscores and add 'rc', e.g.
|
||
|
|
<tt>/MyCompany/MyApplication/background color</tt> will be stored in
|
||
|
|
<tt>myapplicationrc</tt> (assuming that <tt>/MyCompany</tt> is part of
|
||
|
|
the search path).
|
||
|
|
<p> <p>See also <a href="#removeSearchPath">removeSearchPath</a>().
|
||
|
|
|
||
|
|
<p>
|
||
|
|
<p>Example: <a href="canvas-chart-example.html#x2890">chart/chartform.cpp</a>.
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="readBoolEntry"></a>TQSettings::readBoolEntry ( const <a href="ntqstring.html">TQString</a> & key, bool def = FALSE, bool * ok = 0 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
|
<p> Reads the entry specified by <em>key</em>, and returns a bool, or the
|
||
|
|
default value, <em>def</em>, if the entry couldn't be read.
|
||
|
|
If <em>ok</em> is non-null, *ok is set to TRUE if the key was read, FALSE
|
||
|
|
otherwise.
|
||
|
|
<p> <p>See also <a href="#readEntry">readEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#writeEntry">writeEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>double <a name="readDoubleEntry"></a>TQSettings::readDoubleEntry ( const <a href="ntqstring.html">TQString</a> & key, double def = 0, bool * ok = 0 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
|
<p> Reads the entry specified by <em>key</em>, and returns a double, or the
|
||
|
|
default value, <em>def</em>, if the entry couldn't be read.
|
||
|
|
If <em>ok</em> is non-null, *ok is set to TRUE if the key was read, FALSE
|
||
|
|
otherwise.
|
||
|
|
<p> <p>See also <a href="#readEntry">readEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), <a href="#writeEntry">writeEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="readEntry"></a>TQSettings::readEntry ( const <a href="ntqstring.html">TQString</a> & key, const <a href="ntqstring.html">TQString</a> & def = TQString::null, bool * ok = 0 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
13 years ago
|
<p> Reads the entry specified by <em>key</em>, and returns a <a href="ntqstring.html">TQString</a>, or the
|
||
|
13 years ago
|
default value, <em>def</em>, if the entry couldn't be read.
|
||
|
|
If <em>ok</em> is non-null, *ok is set to TRUE if the key was read, FALSE
|
||
|
|
otherwise.
|
||
|
|
<p> <p>See also <a href="#readListEntry">readListEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), <a href="#writeEntry">writeEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="readListEntry"></a>TQSettings::readListEntry ( const <a href="ntqstring.html">TQString</a> & key, bool * ok = 0 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
|
Reads the entry specified by <em>key</em> as a string. If <em>ok</em> is not
|
||
|
|
0, <em>*ok</em> is set to TRUE if the key was read, otherwise <em>*ok</em> is
|
||
|
|
set to FALSE.
|
||
|
|
<p> Note that if you want to iterate over the list, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
13 years ago
|
<a href="ntqstringlist.html">TQStringList</a> list = mySettings.readListEntry( "recentfiles" );
|
||
|
|
TQStringList::Iterator it = list.<a href="ntqvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="ntqvaluelist.html#end">end</a>() ) {
|
||
|
13 years ago
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
13 years ago
|
<p> <p>See also <a href="#readEntry">readEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), <a href="#writeEntry">writeEntry</a>(), <a href="#removeEntry">removeEntry</a>(), and <a href="ntqstringlist.html#split">TQStringList::split</a>().
|
||
|
13 years ago
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="readListEntry-4"></a>TQSettings::readListEntry ( const <a href="ntqstring.html">TQString</a> & key, const <a href="qchar.html">TQChar</a> & separator, bool * ok = 0 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Reads the entry specified by <em>key</em> as a string. The <em>separator</em>
|
||
|
13 years ago
|
is used to create a <a href="ntqstringlist.html">TQStringList</a> by calling <a href="ntqstringlist.html#split">TQStringList::split</a>(<em>separator</em>, entry). If <em>ok</em> is not 0: <em>*ok</em> is set to TRUE
|
||
|
13 years ago
|
if the key was read, otherwise <em>*ok</em> is set to FALSE.
|
||
|
|
<p> <b>Warning:</b> As the documentation states, TQStringList::split() will
|
||
|
|
omit empty strings from the list. Because of this, it is
|
||
|
|
impossible to retrieve identical list data with this function. We
|
||
|
|
recommend using the <a href="#readListEntry">readListEntry</a>() and <a href="#writeEntry">writeEntry</a>() overloads
|
||
|
|
that do not take a <em>separator</em> argument.
|
||
|
|
<p> Note that if you want to iterate over the list, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
13 years ago
|
<a href="ntqstringlist.html">TQStringList</a> list = mySettings.readListEntry( "size", " " );
|
||
|
|
TQStringList::Iterator it = list.<a href="ntqvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="ntqvaluelist.html#end">end</a>() ) {
|
||
|
13 years ago
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
13 years ago
|
<p> <p>See also <a href="#readEntry">readEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), <a href="#writeEntry">writeEntry</a>(), <a href="#removeEntry">removeEntry</a>(), and <a href="ntqstringlist.html#split">TQStringList::split</a>().
|
||
|
13 years ago
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="readNumEntry"></a>TQSettings::readNumEntry ( const <a href="ntqstring.html">TQString</a> & key, int def = 0, bool * ok = 0 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
|
<p> Reads the entry specified by <em>key</em>, and returns an integer, or the
|
||
|
|
default value, <em>def</em>, if the entry couldn't be read.
|
||
|
|
If <em>ok</em> is non-null, *ok is set to TRUE if the key was read, FALSE
|
||
|
|
otherwise.
|
||
|
|
<p> <p>See also <a href="#readEntry">readEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), <a href="#writeEntry">writeEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="removeEntry"></a>TQSettings::removeEntry ( const <a href="ntqstring.html">TQString</a> & key )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Removes the entry specified by <em>key</em>.
|
||
|
|
<p> Returns true if the entry was successfully removed; otherwise
|
||
|
|
returns false. Note that removing the last entry in any given
|
||
|
|
folder, will also remove the folder.
|
||
|
|
<p> <p>See also <a href="#readEntry">readEntry</a>() and <a href="#writeEntry">writeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="removeSearchPath"></a>TQSettings::removeSearchPath ( <a href="ntqsettings.html#System-enum">System</a> s, const <a href="ntqstring.html">TQString</a> & path )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Removes all occurrences of <em>path</em> (using exact matching) from the
|
||
|
|
settings search path for system <em>s</em>. Note that the default search
|
||
|
|
paths cannot be removed.
|
||
|
|
<p> <p>See also <a href="#insertSearchPath">insertSearchPath</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="resetGroup"></a>TQSettings::resetGroup ()
|
||
|
|
</h3>
|
||
|
|
Set the current key prefix to the empty string.
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="setPath"></a>TQSettings::setPath ( const <a href="ntqstring.html">TQString</a> & domain, const <a href="ntqstring.html">TQString</a> & product, <a href="ntqsettings.html#Scope-enum">Scope</a> scope = Global )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Insert platform-dependent paths from platform-independent information.
|
||
|
|
<p> The <em>domain</em> should be an Internet domain name
|
||
|
|
controlled by the producer of the software, eg. Trolltech products
|
||
|
|
use "trolltech.com".
|
||
|
|
<p> The <em>product</em> should be the official name of the product.
|
||
|
|
<p> The <em>scope</em> should be
|
||
|
|
TQSettings::User for user-specific settings, or
|
||
|
|
TQSettings::Global for system-wide settings (generally
|
||
|
|
these will be read-only to many users).
|
||
|
|
<p> Not all information is relevant on all systems.
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="subkeyList"></a>TQSettings::subkeyList ( const <a href="ntqstring.html">TQString</a> & key ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns a list of the keys which contain subkeys under <em>key</em>. Does <em>not</em> return any keys that contain entries.
|
||
|
|
<p> Example settings:
|
||
|
|
<pre>
|
||
|
|
/MyCompany/MyApplication/background color
|
||
|
|
/MyCompany/MyApplication/foreground color
|
||
|
|
/MyCompany/MyApplication/geometry/x
|
||
|
|
/MyCompany/MyApplication/geometry/y
|
||
|
|
/MyCompany/MyApplication/geometry/width
|
||
|
|
/MyCompany/MyApplication/geometry/height
|
||
|
|
/MyCompany/MyApplication/recent files/1
|
||
|
|
/MyCompany/MyApplication/recent files/2
|
||
|
|
/MyCompany/MyApplication/recent files/3
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<pre>
|
||
|
13 years ago
|
<a href="ntqstringlist.html">TQStringList</a> keys = settings.subkeyList( "/MyCompany/MyApplication" );
|
||
|
13 years ago
|
</pre>
|
||
|
|
|
||
|
|
<p> In the above example, <tt>keys</tt> will contain 'geometry' and
|
||
|
|
'recent files'. It will not contain 'background color' or
|
||
|
|
'foreground color' because those keys contain entries not
|
||
|
|
subkeys. To get a list of keys that contain entries rather than
|
||
|
|
subkeys use <a href="#entryList">entryList</a>() instead.
|
||
|
|
<p> <b>Warning:</b> In the above example, if TQSettings is writing to an Ini file,
|
||
|
|
then a call to
|
||
|
|
<pre> subkeyList("/MyCompany") </pre>
|
||
|
|
|
||
|
|
will return an empty list. This happens because a key like
|
||
|
|
<pre> /MyCompany/MyApplication/background color </pre>
|
||
|
|
|
||
|
|
is written to the file <em>"mycompanyrc"</em>, under the section <em>[MyApplication]</em>.
|
||
|
|
This call is therefore a request to list the sections in an ini file, which
|
||
|
|
is not supported in this version of TQSettings. This is a known issue which
|
||
|
|
will be fixed in TQt-4.
|
||
|
|
<p> <p>See also <a href="#entryList">entryList</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="writeEntry"></a>TQSettings::writeEntry ( const <a href="ntqstring.html">TQString</a> & key, bool value )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Writes the boolean entry <em>value</em> into key <em>key</em>. The <em>key</em> is
|
||
|
|
created if it doesn't exist. Any previous value is overwritten by <em>value</em>.
|
||
|
|
<p> If an error occurs the settings are left unchanged and FALSE is
|
||
|
|
returned; otherwise TRUE is returned.
|
||
|
13 years ago
|
<p> <b>Warning:</b> On certain platforms, keys are required to contain at least
|
||
|
13 years ago
|
two components (e.g., "/foo/bar"). This limitation does not apply to
|
||
|
|
TQt 4.
|
||
|
|
<p> <p>See also <a href="#readListEntry">readListEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
|
<p>Example: <a href="canvas-chart-example.html#x2891">chart/chartform.cpp</a>.
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="writeEntry-2"></a>TQSettings::writeEntry ( const <a href="ntqstring.html">TQString</a> & key, double value )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Writes the double entry <em>value</em> into key <em>key</em>. The <em>key</em> is
|
||
|
|
created if it doesn't exist. Any previous value is overwritten by <em>value</em>.
|
||
|
|
<p> If an error occurs the settings are left unchanged and FALSE is
|
||
|
|
returned; otherwise TRUE is returned.
|
||
|
|
<p> <p>See also <a href="#readListEntry">readListEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="writeEntry-3"></a>TQSettings::writeEntry ( const <a href="ntqstring.html">TQString</a> & key, int value )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Writes the integer entry <em>value</em> into key <em>key</em>. The <em>key</em> is
|
||
|
|
created if it doesn't exist. Any previous value is overwritten by <em>value</em>.
|
||
|
|
<p> If an error occurs the settings are left unchanged and FALSE is
|
||
|
|
returned; otherwise TRUE is returned.
|
||
|
|
<p> <p>See also <a href="#readListEntry">readListEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="writeEntry-5"></a>TQSettings::writeEntry ( const <a href="ntqstring.html">TQString</a> & key, const <a href="ntqstring.html">TQString</a> & value )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Writes the string entry <em>value</em> into key <em>key</em>. The <em>key</em> is
|
||
|
|
created if it doesn't exist. Any previous value is overwritten by <em>value</em>. If <em>value</em> is an empty string or a null string the key's
|
||
|
|
value will be an empty string.
|
||
|
|
<p> If an error occurs the settings are left unchanged and FALSE is
|
||
|
|
returned; otherwise TRUE is returned.
|
||
|
|
<p> <p>See also <a href="#readListEntry">readListEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="writeEntry-6"></a>TQSettings::writeEntry ( const <a href="ntqstring.html">TQString</a> & key, const <a href="ntqstringlist.html">TQStringList</a> & value )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Writes the string list entry <em>value</em> into key <em>key</em>. The <em>key</em>
|
||
|
|
is created if it doesn't exist. Any previous value is overwritten
|
||
|
|
by <em>value</em>.
|
||
|
|
<p> If an error occurs the settings are left unchanged and FALSE is
|
||
|
|
returned; otherwise returns TRUE.
|
||
|
|
<p> <p>See also <a href="#readListEntry">readListEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), and <a href="#removeEntry">removeEntry</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>bool <a name="writeEntry-7"></a>TQSettings::writeEntry ( const <a href="ntqstring.html">TQString</a> & key, const <a href="ntqstringlist.html">TQStringList</a> & value, const <a href="qchar.html">TQChar</a> & separator )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Writes the string list entry <em>value</em> into key <em>key</em>. The <em>key</em>
|
||
|
|
is created if it doesn't exist. Any previous value is overwritten
|
||
|
|
by <em>value</em>. The list is stored as a sequence of strings separated
|
||
|
13 years ago
|
by <em>separator</em> (using <a href="ntqstringlist.html#join">TQStringList::join</a>()), so none of the
|
||
|
13 years ago
|
strings in the list should contain the separator. If the list is
|
||
|
|
empty or null the key's value will be an empty string.
|
||
|
|
<p> <b>Warning:</b> The list should not contain empty or null strings, as
|
||
|
13 years ago
|
<a href="#readListEntry">readListEntry</a>() will use <a href="ntqstringlist.html#split">TQStringList::split</a>() to recreate the
|
||
|
13 years ago
|
list. As the documentation states, TQStringList::split() will omit
|
||
|
|
empty strings from the list. Because of this, it is impossible to
|
||
|
|
retrieve identical list data that is stored with this function.
|
||
|
|
We recommend using the <a href="#writeEntry">writeEntry</a>() and readListEntry() overloads
|
||
|
|
that do not take a <em>separator</em> argument.
|
||
|
|
<p> If an error occurs the settings are left unchanged and FALSE is
|
||
|
|
returned; otherwise returns TRUE.
|
||
|
13 years ago
|
<p> <p>See also <a href="#readListEntry">readListEntry</a>(), <a href="#readNumEntry">readNumEntry</a>(), <a href="#readDoubleEntry">readDoubleEntry</a>(), <a href="#readBoolEntry">readBoolEntry</a>(), <a href="#removeEntry">removeEntry</a>(), and <a href="ntqstringlist.html#join">TQStringList::join</a>().
|
||
|
13 years ago
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">TQt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|