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POSTL and UTF-8 file input/output. How to do it?
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  1. POSTL and UTF-8 file input/output. How to do it?
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    copied!<p>I use <code>wchar_t</code> for internal strings and UTF-8 for storage in files. I need to use STL to input/output text to <em>screen</em> and also do it by using full Lithuanian charset.<br> It's all fine because I'm not forced to do the same for <em>files</em>, so the following example does the job just fine:<pre><code>#include &lt;io.h&gt; <code>#</code>include &lt;fcntl.h&gt; <code>#</code>include &lt;iostream&gt; _setmode (_fileno(stdout), _O_U16TEXT); wcout &lt;&lt; L"AaĄąfl" &lt;&lt; endl; </code></pre>But I became curious and attempted to do the same with files with no success. Of course I could use formatted input/output, but that is... <em>discouraged</em>.<pre><code> FILE* fp; _wfopen_s (&amp;fp, L"utf-8_out_test.txt", L"w"); _setmode (_fileno (fp), _O_U8TEXT); _fwprintf_p (fp, L"AaĄą\nfl"); fclose (fp); _wfopen_s (&amp;fp, L"utf-8_in_test.txt", L"r"); _setmode (_fileno (fp), _O_U8TEXT); wchar_t text[256]; fseek (fp, NULL, SEEK_SET); fwscanf (fp, L"%s", text); wcout &lt;&lt; text &lt;&lt; endl; fwscanf (fp, L"%s", text); wcout &lt;&lt; text &lt;&lt; endl; fclose (fp);</code></pre>This snippet works <strong>perfectly</strong> (although I am not sure how it handles malformed chars). So, is there any way to:</p> <ul> <li>get <code>FILE*</code> or integer file handle form a <code>std::basic_*fstream</code>?</li> <li>simulate <code>_setmode ()</code> on it?</li> <li>extend <code>std::basic_*fstream</code> so it handles UTF-8 I/O?</li> </ul> <p>Yes, I am studying at an university and this is somewhat related to my assignments, but I am trying to figure this out for myself. It won't influence my grade or anything like that.</p>
 

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