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310 lines
16 KiB
310 lines
16 KiB
<!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/qstringlist.cpp:46 -->
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<html>
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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>QStringList Class</title>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Functions</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>QStringList Class Reference</h1>
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<p>The QStringList class provides a list of strings.
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<a href="#details">More...</a>
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<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when Qt is built with thread support.</p>
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<p><tt>#include <<a href="qstringlist-h.html">qstringlist.h</a>></tt>
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<p>Inherits <a href="qvaluelist.html">QValueList</a><QString>.
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<p><a href="qstringlist-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><a href="#QStringList"><b>QStringList</b></a> ()</li>
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<li class=fn><a href="#QStringList-2"><b>QStringList</b></a> ( const QStringList & l )</li>
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<li class=fn><a href="#QStringList-3"><b>QStringList</b></a> ( const QValueList<QString> & l )</li>
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<li class=fn><a href="#QStringList-4"><b>QStringList</b></a> ( const QString & i )</li>
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<li class=fn><a href="#QStringList-5"><b>QStringList</b></a> ( const char * i )</li>
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<li class=fn>void <a href="#sort"><b>sort</b></a> ()</li>
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<li class=fn>QString <a href="#join"><b>join</b></a> ( const QString & sep ) const</li>
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<li class=fn>QStringList <a href="#grep"><b>grep</b></a> ( const QString & str, bool cs = TRUE ) const</li>
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<li class=fn>QStringList <a href="#grep-2"><b>grep</b></a> ( const QRegExp & rx ) const</li>
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<li class=fn>QStringList & <a href="#gres"><b>gres</b></a> ( const QString & before, const QString & after, bool cs = TRUE )</li>
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<li class=fn>QStringList & <a href="#gres-2"><b>gres</b></a> ( const QRegExp & rx, const QString & after )</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>QStringList <a href="#fromStrList"><b>fromStrList</b></a> ( const QStrList & ascii )</li>
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<li class=fn>QStringList <a href="#split-2"><b>split</b></a> ( const QString & sep, const QString & str, bool allowEmptyEntries = FALSE )</li>
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<li class=fn>QStringList <a href="#split-3"><b>split</b></a> ( const QChar & sep, const QString & str, bool allowEmptyEntries = FALSE )</li>
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<li class=fn>QStringList <a href="#split"><b>split</b></a> ( const QRegExp & sep, const QString & str, bool allowEmptyEntries = FALSE )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QStringList class provides a list of strings.
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<p>
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<p> It is used to store and manipulate strings that logically belong
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together. Essentially QStringList is a <a href="qvaluelist.html">QValueList</a> of <a href="qstring.html">QString</a>
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objects. Unlike <a href="qstrlist.html">QStrList</a>, which stores pointers to characters,
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QStringList holds real QString objects. It is the class of choice
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whenever you work with Unicode strings. QStringList is part of the
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<a href="qtl.html">Qt Template Library</a>.
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<p> Like QString itself, QStringList objects are <a href="shclass.html#implicitly-shared">implicitly shared</a>, so
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passing them around as value-parameters is both fast and safe.
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<p> Strings can be added to a list using <a href="qvaluelist.html#append">append</a>(), <a href="qvaluelist.html#operator+-eq">operator+=</a>() or
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<a href="qvaluelist.html#operator-lt-lt">operator<<</a>(), e.g.
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<pre>
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QStringList fonts;
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fonts.<a href="qvaluelist.html#append">append</a>( "Times" );
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fonts += "Courier";
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fonts += "Courier New";
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fonts << "Helvetica [Cronyx]" << "Helvetica [Adobe]";
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</pre>
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<p> String lists have an iterator, QStringList::Iterator(), e.g.
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<pre>
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for ( QStringList::<a href="qvaluelist.html#Iterator">Iterator</a> it = fonts.begin(); it != fonts.end(); ++it ) {
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cout << *it << ":";
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}
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cout << endl;
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// Output:
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// Times:Courier:Courier New:Helvetica [Cronyx]:Helvetica [Adobe]:
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</pre>
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<p> Many Qt functions return string lists by value; to iterate over
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these you should make a copy and iterate over the copy.
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<p> You can concatenate all the strings in a string list into a single
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string (with an optional separator) using <a href="#join">join</a>(), e.g.
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<pre>
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<a href="qstring.html">QString</a> allFonts = fonts.join( ", " );
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cout << allFonts << endl;
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// Output:
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// Times, Courier, Courier New, Helvetica [Cronyx], Helvetica [Adobe]
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</pre>
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<p> You can sort the list with <a href="#sort">sort</a>(), and extract a new list which
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contains only those strings which contain a particular substring
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(or match a particular <a href="qregexp.html#regular-expression">regular expression</a>) using the <a href="#grep">grep</a>()
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functions, e.g.
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<pre>
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fonts.sort();
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cout << fonts.join( ", " ) << endl;
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// Output:
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// Courier, Courier New, Helvetica [Adobe], Helvetica [Cronyx], Times
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QStringList helveticas = fonts.grep( "Helvetica" );
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cout << helveticas.<a href="#join">join</a>( ", " ) << endl;
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// Output:
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// Helvetica [Adobe], Helvetica [Cronyx]
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</pre>
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<p> Existing strings can be split into string lists with character,
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string or regular expression separators, e.g.
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<pre>
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<a href="qstring.html">QString</a> s = "Red\tGreen\tBlue";
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QStringList colors = QStringList::<a href="#split">split</a>( "\t", s );
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cout << colors.<a href="#join">join</a>( ", " ) << endl;
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// Output:
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// Red, Green, Blue
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</pre>
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<p>See also <a href="shared.html">Implicitly and Explicitly Shared Classes</a>, <a href="text.html">Text Related Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QStringList"></a>QStringList::QStringList ()
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</h3>
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<p> Creates an empty string list.
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<h3 class=fn><a name="QStringList-2"></a>QStringList::QStringList ( const <a href="qstringlist.html">QStringList</a> & l )
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</h3>
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<p> Creates a copy of the list <em>l</em>. This function is very fast
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because QStringList is <a href="shclass.html#implicitly-shared">implicitly shared</a>. In most situations this
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acts like a <a href="shclass.html#deep-copy">deep copy</a>, for example, if this list or the original
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one or some other list referencing the same shared data is
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modified, the modifying list first makes a copy, i.e.
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copy-on-write.
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In a threaded environment you may require a real deep copy
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.
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<h3 class=fn><a name="QStringList-3"></a>QStringList::QStringList ( const <a href="qvaluelist.html">QValueList</a><QString> & l )
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</h3>
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<p> Constructs a new string list that is a copy of <em>l</em>.
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<h3 class=fn><a name="QStringList-4"></a>QStringList::QStringList ( const <a href="qstring.html">QString</a> & i )
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</h3>
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<p> Constructs a string list consisting of the single string <em>i</em>.
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Longer lists are easily created as follows:
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<p> <pre>
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QStringList items;
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items << "Buy" << "Sell" << "Update" << "Value";
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</pre>
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<h3 class=fn><a name="QStringList-5"></a>QStringList::QStringList ( const char * i )
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</h3>
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<p> Constructs a string list consisting of the single Latin-1 string <em>i</em>.
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="fromStrList"></a>QStringList::fromStrList ( const <a href="qstrlist.html">QStrList</a> & ascii )<tt> [static]</tt>
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</h3>
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Converts from an ASCII-QStrList <em>ascii</em> to a QStringList (Unicode).
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="grep"></a>QStringList::grep ( const <a href="qstring.html">QString</a> & str, bool cs = TRUE ) const
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</h3>
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Returns a list of all the strings containing the substring <em>str</em>.
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<p> If <em>cs</em> is TRUE, the grep is done case-sensitively; otherwise
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case is ignored.
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<p> <pre>
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QStringList list;
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list << "Bill Gates" << "John Doe" << "Bill Clinton";
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list = list.<a href="#grep">grep</a>( "Bill" );
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// list == ["Bill Gates", "Bill Clinton"]
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</pre>
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<p> <p>See also <a href="qstring.html#find">QString::find</a>().
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="grep-2"></a>QStringList::grep ( const <a href="qregexp.html">QRegExp</a> & rx ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns a list of all the strings that match the <a href="qregexp.html#regular-expression">regular expression</a> <em>rx</em>.
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<p> <p>See also <a href="qstring.html#find">QString::find</a>().
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<h3 class=fn><a href="qstringlist.html">QStringList</a> & <a name="gres"></a>QStringList::gres ( const <a href="qstring.html">QString</a> & before, const <a href="qstring.html">QString</a> & after, bool cs = TRUE )
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</h3>
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Replaces every occurrence of the string <em>before</em> in the strings
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that constitute the string list with the string <em>after</em>. Returns
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a reference to the string list.
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<p> If <em>cs</em> is TRUE, the search is case sensitive; otherwise the
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search is case insensitive.
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<p> Example:
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<pre>
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QStringList list;
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list << "alpha" << "beta" << "gamma" << "epsilon";
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list.<a href="#gres">gres</a>( "a", "o" );
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// list == ["olpho", "beto", "gommo", "epsilon"]
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</pre>
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<p> <p>See also <a href="qstring.html#replace">QString::replace</a>().
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<h3 class=fn><a href="qstringlist.html">QStringList</a> & <a name="gres-2"></a>QStringList::gres ( const <a href="qregexp.html">QRegExp</a> & rx, const <a href="qstring.html">QString</a> & after )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Replaces every occurrence of the regexp <em>rx</em> in the string
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with <em>after</em>. Returns a reference to the string list.
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<p> Example:
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<pre>
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QStringList list;
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list << "alpha" << "beta" << "gamma" << "epsilon";
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list.<a href="#gres">gres</a>( QRegExp("^a"), "o" );
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// list == ["olpha", "beta", "gamma", "epsilon"]
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</pre>
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<p> For regexps containing <a href="qregexp.html#capturing-text">capturing parentheses</a>, occurrences of <b>\1</b>,
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<b>\2</b>, ..., in <em>after</em> are replaced with <em>rx</em>.cap(1),
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cap(2), ...
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<p> Example:
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<pre>
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QStringList list;
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list << "Bill Clinton" << "Gates, Bill";
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list.<a href="#gres">gres</a>( QRegExp("^(.*), (.*)$"), "\\2 \\1" );
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// list == ["Bill Clinton", "Bill Gates"]
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</pre>
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<p> <p>See also <a href="qstring.html#replace">QString::replace</a>().
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<h3 class=fn><a href="qstring.html">QString</a> <a name="join"></a>QStringList::join ( const <a href="qstring.html">QString</a> & sep ) const
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</h3>
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Joins the string list into a single string with each element
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separated by the string <em>sep</em> (which can be empty).
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<p> <p>See also <a href="#split">split</a>().
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<p>Examples: <a href="fileiconview-example.html#x872">fileiconview/qfileiconview.cpp</a> and <a href="toplevel-example.html#x2533">toplevel/options.ui.h</a>.
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<h3 class=fn>void <a name="sort"></a>QStringList::sort ()
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</h3>
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Sorts the list of strings in ascending case-sensitive order.
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<p> Sorting is very fast. It uses the <a href="qtl.html">Qt Template
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Library's</a> efficient HeapSort implementation that has a
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time complexity of O(n*log n).
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<p> If you want to sort your strings in an arbitrary order consider
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using a <a href="qmap.html">QMap</a>. For example you could use a QMap<QString,QString>
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to create a case-insensitive ordering (e.g. mapping the lowercase
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text to the text), or a QMap<int,QString> to sort the strings by
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some integer index, etc.
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<p>Example: <a href="themes-example.html#x341">themes/themes.cpp</a>.
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="split"></a>QStringList::split ( const <a href="qregexp.html">QRegExp</a> & sep, const <a href="qstring.html">QString</a> & str, bool allowEmptyEntries = FALSE )<tt> [static]</tt>
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</h3>
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Splits the string <em>str</em> into strings wherever the <a href="qregexp.html#regular-expression">regular expression</a> <em>sep</em> occurs, and returns the list of those strings.
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<p> If <em>allowEmptyEntries</em> is TRUE, a null string is inserted in
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the list wherever the separator matches twice without intervening
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text.
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<p> For example, if you split the string "a,,b,c" on commas, <a href="#split">split</a>()
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returns the three-item list "a", "b", "c" if <em>allowEmptyEntries</em>
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is FALSE (the default), and the four-item list "a", "", "b", "c"
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if <em>allowEmptyEntries</em> is TRUE.
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<p> If <em>sep</em> does not match anywhere in <em>str</em>, split() returns a
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single element list with the element containing the single string
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<em>str</em>.
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<p> <p>See also <a href="#join">join</a>() and <a href="qstring.html#section">QString::section</a>().
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<p>Examples: <a href="tutorial2-03.html#x2552">chart/element.cpp</a>, <a href="dirview-example.html#x1703">dirview/dirview.cpp</a>, and <a href="httpd-example.html#x733">network/httpd/httpd.cpp</a>.
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="split-2"></a>QStringList::split ( const <a href="qstring.html">QString</a> & sep, const <a href="qstring.html">QString</a> & str, bool allowEmptyEntries = FALSE )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> This version of the function uses a <a href="qstring.html">QString</a> as separator, rather
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than a <a href="qregexp.html#regular-expression">regular expression</a>.
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<p> If <em>sep</em> is an empty string, the return value is a list of
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one-character strings: <a href="#split">split</a>( QString( "" ), "four" ) returns the
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four-item list, "f", "o", "u", "r".
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<p> If <em>allowEmptyEntries</em> is TRUE, a null string is inserted in
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the list wherever the separator matches twice without intervening
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text.
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<p> <p>See also <a href="#join">join</a>() and <a href="qstring.html#section">QString::section</a>().
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="split-3"></a>QStringList::split ( const <a href="qchar.html">QChar</a> & sep, const <a href="qstring.html">QString</a> & str, bool allowEmptyEntries = FALSE )<tt> [static]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> This version of the function uses a <a href="qchar.html">QChar</a> as separator, rather
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than a <a href="qregexp.html#regular-expression">regular expression</a>.
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<p> <p>See also <a href="#join">join</a>() and <a href="qstring.html#section">QString::section</a>().
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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