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POUTF-8, CString and CFile? (C++, MFC)
 

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    <p>I'm currently working on a MFC program that specifically has to work with UTF-8. At some point, I have to write UTF-8 data into a file; to do that, I'm using CFiles and CStrings.</p> <p>When I get to write utf-8 (russian characters, to be more precise) data into a file, the output looks like </p> <pre><code>Ðàñïå÷àòàíî: Ñèñòåìà Ïðîèçâîäñòâî </code></pre> <p>and etc. This is assurely not utf-8. To read this data properly, I have to change my system settings; changing non ASCII characters to a russian encoding table does work, but then all my latin based non-ascii characters get to fail. Anyway, that's how I do it.</p> <pre><code>CFile CSVFile( m_sCible, CFile::modeCreate|CFile::modeWrite); CString sWorkingLine; //Add stuff into sWorkingline CSVFile.Write(sWorkingLine,sWorkingLine.GetLength()); //Clean sWorkingline and start over </code></pre> <p>Am I missing something? Shall I use something else instead? Is there some kind of catch I've missed? I'll be tuned in for your wisdom and experience, fellow programmers.</p> <p>EDIT: Of course, as I just asked a question, I finally find something which might be interesting, that can be found <a href="http://blog.kalmbachnet.de/?postid=105" rel="noreferrer">here</a>. Thought I might share it.</p> <p>EDIT 2:</p> <p>Okay, so I added the BOM to my file, which now contains chineese character, probably because I didn't convert my line to UTF-8. To add the bom I did...</p> <pre><code>char BOM[3]={0xEF, 0xBB, 0xBF}; CSVFile.Write(BOM,3); </code></pre> <p>And after that, I added...</p> <pre><code> TCHAR TestLine; //Convert the line to UTF-8 multibyte. WideCharToMultiByte (CP_UTF8,0,sWorkingLine,sWorkingLine.GetLength(),TestLine,strlen(TestLine)+1,NULL,NULL); //Add the line to file. CSVFile.Write(TestLine,strlen(TestLine)+1); </code></pre> <p><em>But then I cannot compile, as I don't really know how to get the length of TestLine. strlen doesn't seem to accept TCHAR.</em> Fixed, used a static lenght of 1000 instead.</p> <p>EDIT 3:</p> <p>So, I added this code...</p> <pre><code> wchar_t NewLine[1000]; wcscpy( NewLine, CT2CW( (LPCTSTR) sWorkingLine )); TCHAR* TCHARBuf = new TCHAR[1000]; //Convert the line to UTF-8 multibyte. WideCharToMultiByte (CP_UTF8,0,NewLine,1000,TCHARBuf,1000,NULL,NULL); //Find how many characters we have to add size_t size = 0; HRESULT hr = StringCchLength(TCHARBuf, MAX_PATH, &amp;size); //Add the line to the file CSVFile.Write(TCHARBuf,size); </code></pre> <p>It compiles fine, but when I go look at my new file, it's exactly the same as when I didn't have all this new code (ex : Ðàñïå÷àòàíî:). It feels like I didn't do a step forward, although I guess only a small thing is what separates me from victory.</p> <p>EDIT 4: </p> <p>I removed previously added code, as Nate asked, and I decided to use his code instead, meaning that now, when I get to add my line, I have...</p> <pre><code> CT2CA outputString(sWorkingLine, CP_UTF8); //Add line to file. CSVFile.Write(outputString,::strlen(outputString)); </code></pre> <p>Everything compiles fine, but the russian characters are shown as ???????. Getting closer, but still not that. Btw, I'd like to thank everyone who tried/tries to help me, it is MUCH appreciated. I've been stuck on this for a while now, I can't wait for this problem to be gone.</p> <p>FINAL EDIT (I hope) By changing the way I first got my UTF-8 characters (I reencoded without really knowing), which was erroneous with my new way of outputting the text, I got acceptable results. By adding the UTF-8 BOM char at the beginning of my file, it could be read as Unicode in other programs, like Excel.</p> <p>Hurray! Thank you everyone!</p>
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    1. COYou'll need to use _tcslen to get the length to a TCHAR string. Like: TCHAR* testTCHAR = _T("test"); int tcharLength = _tcslen(testTCHAR);
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    2. COAlso if you need to convert a CString to a TCHAR* string try this CString testCString = _T("test"); TCHAR* testTCHAR = testCString.GetBuffer();
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    3. COYou are working way too hard. Use `CT2CA` with a second parameter of `CP_UTF8`. See my post below.
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