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    <p>From <a href="http://www.globalyzer.com/gzserver/help/localeSensitiveMethods/formatting.htm#larges" rel="nofollow">http://www.globalyzer.com/gzserver/help/localeSensitiveMethods/formatting.htm#larges</a></p> <p>Unqualified String Specifiers (large %S)</p> <p>These tables show how Windows and ANSI treat parameters based on the %S specifier and the style of function call (single, generic, or wide):</p> <pre> Windows function Specifier Parameter needs to be printf/sprintf (single/MBCS) %S wchar_t* _tprintf/_stprintf (generic) %S (don't use) wprintf/swprintf (wide) %S char* ANSI function Specifier Parameter needs to be printf/sprintf (single/MBCS) %S wchar_t* wprintf/swprintf (wide) %S wchar_t* </pre> <p>Both ANSI and Windows treat %S basically as opposite of %s in terms of single byte or wide, which ironically means that Windows and ANSI again handle these specifiers differently.</p> <p>Note that ANSI in essence always treats %S in the same way as %ls, in other words it is always assumed to be wide string.</p> <p>Windows on the other hand treats %S differently based on the type of function call. For single byte function calls, %S acts like the wide %ls specifier, but for wide functions calls, %S acts like the single byte %hs specifier.</p> <p>This specifier should not be used for Windows Generic calls. Since %S is the "opposite" of %s, the parameter would need to be wide if the _UNICODE flag is off, and single byte if the _UNICODE flag is on. The TCHAR generic type does not work this way, and there's not "anti-TCHAR" kind of datatype.</p> <p>I tried the following in Visual C++ 2010:</p> <pre><code>#include "stdafx.h" #include &lt;Windows.h&gt; int _tmain(int argc, _TCHAR* argv[]) { WCHAR cBuf[MAX_PATH]; TCHAR tBuf[MAX_PATH]; wcsncpy_s(cBuf, L"Testing\r\n", MAX_PATH); _tcsncpy_s(tBuf, _T("Testing\r\n"), MAX_PATH); printf("%S", cBuf); // Microsoft extension printf("%ls", cBuf); // works in VC++ 2010 wprintf(L"%s", cBuf); // wide _tprintf(_T("%s"), tBuf); // single-byte/wide return 0; } </code></pre> <p>Settings:</p> <p>/ZI /nologo /W3 /WX- /Od /Oy- /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /Gm /EHsc /RTC1 /GS /fp:precise /Zc:wchar_t /Zc:forScope /Yu"StdAfx.h" /Fp"Debug\TestWchar.pch" /Fa"Debug\" /Fo"Debug\" /Fd"Debug\vc100.pdb" /Gd /analyze- /errorReport:queue </p>
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    1. CO...why why why...
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    2. COhow can I turn off the unicode flag? right now windows doesnt event acccept %ls or %hs
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    3. COWhich version of Visual Studio are you using? VC++ 2010 supports %ls, but I don't recall VC++ 6 supporting it. If you want to stick to ANSI in earlier versions you may need to use the wprintf function.
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