1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2<html xmlns="http://www.w3.org/1999/xhtml"> 3<head> 4<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> 5<meta http-equiv="X-UA-Compatible" content="IE=9"/> 6<meta name="generator" content="Doxygen 1.8.6"/> 7<title>Boost.Locale: Default Encoding under Microsoft Windows</title> 8<link href="tabs.css" rel="stylesheet" type="text/css"/> 9<script type="text/javascript" src="jquery.js"></script> 10<script type="text/javascript" src="dynsections.js"></script> 11<link href="navtree.css" rel="stylesheet" type="text/css"/> 12<script type="text/javascript" src="resize.js"></script> 13<script type="text/javascript" src="navtree.js"></script> 14<script type="text/javascript"> 15 $(document).ready(initResizable); 16 $(window).load(resizeHeight); 17</script> 18<link href="doxygen.css" rel="stylesheet" type="text/css" /> 19</head> 20<body> 21<div id="top"><!-- do not remove this div, it is closed by doxygen! --> 22<div id="titlearea"> 23<table cellspacing="0" cellpadding="0"> 24 <tbody> 25 <tr style="height: 56px;"> 26 <td id="projectlogo"><img alt="Logo" src="boost-small.png"/></td> 27 <td style="padding-left: 0.5em;"> 28 <div id="projectname">Boost.Locale 29 </div> 30 </td> 31 </tr> 32 </tbody> 33</table> 34</div> 35<!-- end header part --> 36<!-- Generated by Doxygen 1.8.6 --> 37 <div id="navrow1" class="tabs"> 38 <ul class="tablist"> 39 <li><a href="index.html"><span>Main Page</span></a></li> 40 <li class="current"><a href="pages.html"><span>Related Pages</span></a></li> 41 <li><a href="modules.html"><span>Modules</span></a></li> 42 <li><a href="namespaces.html"><span>Namespaces</span></a></li> 43 <li><a href="annotated.html"><span>Classes</span></a></li> 44 <li><a href="files.html"><span>Files</span></a></li> 45 <li><a href="examples.html"><span>Examples</span></a></li> 46 </ul> 47 </div> 48</div><!-- top --> 49<div id="side-nav" class="ui-resizable side-nav-resizable"> 50 <div id="nav-tree"> 51 <div id="nav-tree-contents"> 52 <div id="nav-sync" class="sync"></div> 53 </div> 54 </div> 55 <div id="splitbar" style="-moz-user-select:none;" 56 class="ui-resizable-handle"> 57 </div> 58</div> 59<script type="text/javascript"> 60$(document).ready(function(){initNavTree('default_encoding_under_windows.html','');}); 61</script> 62<div id="doc-content"> 63<div class="header"> 64 <div class="headertitle"> 65<div class="title">Default Encoding under Microsoft Windows </div> </div> 66</div><!--header--> 67<div class="contents"> 68<div class="textblock"><p>All modern operating systems use Unicode.</p> 69<ul> 70<li>Unix operating system family use UTF-8 encoding by default.</li> 71<li>Microsoft Windows had migrated to Wide/UTF-16 API. The narrow encodings had been deprecated and the native OS API became so called "Wide API"</li> 72</ul> 73<p>As a result of radically different approaches, it is very hard to write portable Unicode aware applications.</p> 74<p>Boost Locale fully supports both narrow and wide API. The default character encoding is assumed to be UTF-8 on Windows.</p> 75<p>So if the default operating system Locale is "English_USA.1252" the default locale for Boost.Locale on Windows would be "en_US.UTF-8".</p> 76<p>When the created locale object is installed globally then any libraries that use <code>std::codecvt</code> for conversion between narrow API and the native wide API would handle UTF-8 correctly.</p> 77<p>A good example of such library is Boost.Filesystem v3.</p> 78<p>For example</p> 79<div class="fragment"><div class="line"><span class="preprocessor">#include <boost/locale.hpp></span></div> 80<div class="line"><span class="preprocessor">#include <boost/filesystem/path.hpp></span></div> 81<div class="line"><span class="preprocessor">#include <boost/filesystem/fstream.hpp></span></div> 82<div class="line"></div> 83<div class="line"><span class="keywordtype">int</span> main()</div> 84<div class="line">{</div> 85<div class="line"> <span class="comment">// Create and install global locale</span></div> 86<div class="line"> std::locale::global(<a class="code" href="classboost_1_1locale_1_1generator.html">boost::locale::generator</a>().generate(<span class="stringliteral">""</span>));</div> 87<div class="line"> <span class="comment">// Make boost.filesystem use it</span></div> 88<div class="line"> boost::filesystem::path::imbue(std::locale());</div> 89<div class="line"> <span class="comment">// Now Works perfectly fine with UTF-8!</span></div> 90<div class="line"> boost::filesystem::ofstream hello(<span class="stringliteral">"שלום.txt"</span>); </div> 91<div class="line">}</div> 92</div><!-- fragment --><p>However such behavior may break existing software that assumes that the current encoding is single byte encodings like code page 1252.</p> 93<p><a class="el" href="classboost_1_1locale_1_1generator.html">boost::locale::generator</a> class has a property <a class="el" href="classboost_1_1locale_1_1generator.html#a9afb2b0791abbabd39c800e08d9c9717">use_ansi_encoding()</a> that allows to change the behavior to legacy one and select an ANSI code page as default system encoding.</p> 94<p>So, when the current locale is "English_USA.1252" and the <code>use_ansi_encoding</code> is turned on then the default locale would be "en_US.windows-1252"</p> 95<dl class="section note"><dt>Note</dt><dd><code>winapi</code> backend does not support ANSI encodings, thus UTF-8 encoding is always used for narrow characters. </dd></dl> 96</div></div><!-- contents --> 97</div><!-- doc-content --> 98 99 <li class="footer"> 100© Copyright 2009-2012 Artyom Beilis, Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License</a>, Version 1.0. 101 </li> 102 </ul> 103 </div> 104</body> 105</html> 106
