qhebrewcodec.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/codecs/qrtlcodec.cpp:358 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QHebrewCodec Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td 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="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QHebrewCodec Class Reference</h1><p>The QHebrewCodec class provides conversion to and from visually ordered Hebrew.<a href="#details">More...</a><p><tt>#include <<a href="qrtlcodec-h.html">qrtlcodec.h</a>></tt><p>Inherits <a href="qtextcodec.html">QTextCodec</a>.<p><a href="qhebrewcodec-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn>virtual const char * <a href="#mimeName"><b>mimeName</b></a> () const</div></li><li><div class=fn>virtual QCString <a href="#fromUnicode"><b>fromUnicode</b></a> ( const QString & uc, int & len_in_out ) const</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2> <p> The QHebrewCodec class provides conversion to and from visually ordered Hebrew.<p> Hebrew as a semitic language is written from right to left. Becauseolder computer systems couldn't handle reordering a string so thatthe first letter appears on the right, many older documents wereencoded in visual order, so that the first letter of a line is therightmost one in the string.<p> In contrast to this, Unicode defines characters to be in logicalorder (the order you would read the string). This codec tries toconvert visually ordered Hebrew (8859-8) to Unicode. This might notalways work perfectly, because reversing the bidi (bi-directional)algorithm that transforms from logical to visual order isnon-trivial.<p> Transformation from Unicode to visual Hebrew (8859-8) is done usingthe bidi algorithm in Qt, and will produce correct results, so longas the codec is given the text one whole paragraph at a time. Placeswhere newlines are supposed to start can be indicated by a newlinecharacter ('\n'). Please be aware, that these newline characterschange the reordering behaviour of the algorithm, as the BiDireordering only takes place within one line of text, whereaslinebreaks are determined in visual order.<p> Visually ordered Hebrew is still used quite often in some places,mainly in email communication (as most email programs still don'tunderstand logically ordered Hebrew) and on web pages. The use onweb pages is strongly decreasing however, as there are now a fewbrowsers that correctly support logically ordered Hebrew.<p> This codec has the name "iso8859-8". If you don't want any bidireordering to happen during conversion, use the "iso8859-8-i" codec,which assumes logical order for the 8-bit string.<p>See also <a href="i18n.html">Internationalization with Qt</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a href="qcstring.html">QCString</a> <a name="fromUnicode"></a>QHebrewCodec::fromUnicode ( const <a href="qstring.html">QString</a> & uc, int & len_in_out ) const<tt> [virtual]</tt></h3>Transforms the logically ordered <a href="qstring.html">QString</a>, <em>uc</em>, into a visuallyordered string in the 8859-8 encoding. Qt's bidi algorithm is used toperform this task. Note that newline characters affect thereordering, as reordering is done on a line by line basis.<p> The algorithm is designed to work on whole paragraphs of text, soprocessing a line at a time may produce incorrect results. Thisapproach is taken because the reordering of the contents of aparticular line in a paragraph may depend on the previous line inthe same paragraph.<p> Some encodings (for example Japanese or utf8) are multibye (so oneinput character is mapped to two output characters). The <em>len_in_out</em>argument specifies the number of QChars that should be converted andis set to the number of characters returned.<p>Reimplemented from <a href="qtextcodec.html#fromUnicode">QTextCodec</a>.<h3 class=fn>const char * <a name="mimeName"></a>QHebrewCodec::mimeName () const<tt> [virtual]</tt></h3>Returns the codec's mime name.<p>Reimplemented from <a href="qtextcodec.html#mimeName">QTextCodec</a>.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<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 © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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