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| <div class="title">Default Encoding under Microsoft Windows </div> </div> |
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| <div class="textblock"><p>All modern operating systems use Unicode.</p> |
| <ul> |
| <li>Unix operating system family use UTF-8 encoding by default.</li> |
| <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> |
| </ul> |
| <p>As a result of radically different approaches, it is very hard to write portable Unicode aware applications.</p> |
| <p>Boost Locale fully supports both narrow and wide API. The default character encoding is assumed to be UTF-8 on Windows.</p> |
| <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> |
| <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> |
| <p>A good example of such library is Boost.Filesystem v3.</p> |
| <p>For example</p> |
| <div class="fragment"><pre class="fragment"><span class="preprocessor">#include <boost/locale.hpp></span> |
| <span class="preprocessor">#include <boost/filesystem/path.hpp></span> |
| <span class="preprocessor">#include <boost/filesystem/fstream.hpp></span> |
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| <span class="keywordtype">int</span> main() |
| { |
| <span class="comment">// Create and install global locale</span> |
| std::locale::global(<a class="code" href="classboost_1_1locale_1_1generator.html" title="the major class used for locale generation">boost::locale::generator</a>().generate(<span class="stringliteral">""</span>)); |
| <span class="comment">// Make boost.filesystem use it</span> |
| boost::filesystem::path::imbue(std::locale()); |
| <span class="comment">// Now Works perfectly fine with UTF-8!</span> |
| boost::filesystem::ofstream hello(<span class="stringliteral">"שלום.txt"</span>); |
| } |
| </pre></div><p>However such behavior may break existing software that assumes that the current encoding is single byte encodings like code page 1252.</p> |
| <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> |
| <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> |
| <dl class="note"><dt><b>Note:</b></dt><dd><code>winapi</code> backend does not support ANSI encodings, thus UTF-8 encoding is always used for narrow characters. </dd></dl> |
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