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    <p><a href="http://blogs.msdn.com/b/vcblog/archive/2014/06/18/crt-features-fixes-and-breaking-changes-in-visual-studio-14-ctp1.aspx" rel="nofollow">Visual Studio 14 CTP1</a> and later will always treat <code>%s</code> as a narrow string (<code>char*</code>) unless you define <code>_CRT_STDIO_LEGACY_WIDE_SPECIFIERS</code>. It also added the T length modifier extension which maps to what MS calls the "natural" width. For <code>sprintf</code> <code>%Ts</code> is <code>char*</code> and for <code>swprintf</code> <code>%Ts</code> is <code>wchar_t*</code>.</p> <hr> <p>In Visual Studio 13 and earlier <code>%s</code>/<code>%c</code> is mapped to the natural width of the function/format string and <code>%S</code>/<code>%C</code> is mapped to the opposite of the natural with:</p> <pre><code>printf("%c %C %s %S\n", 'a', L'B', "cd", L"EF"); wprintf(L"%c %C %s %S\n", L'a', 'B', L"cd", "EF"); </code></pre> <p>You can also force a specific width by using a length modifier: <code>%ls</code>, <code>%lc</code>, <code>%ws</code> and <code>%wc</code> always mean <code>wchar_t</code> and <code>%hs</code> and <code>%hc</code> are always <code>char</code>. (Documented for VS2003 <a href="http://msdn.microsoft.com/en-us/library/tcxf1dw6%28v=vs.71%29.aspx" rel="nofollow">here</a> and VC6 <a href="http://msdn.microsoft.com/en-us/library/aa272936%28v=vs.60%29.aspx" rel="nofollow">here</a> (Not sure about <code>%ws</code> and when it was really added)) </p> <p>Mapping <code>%s</code> to the natural width of the function was really handy back in the days of Win9x vs. WinNT, by using the <a href="http://msdn.microsoft.com/en-us/library/c426s321.aspx" rel="nofollow"><code>tchar.h</code> header</a> you could build narrow and wide releases from the same source. When <code>_UNICODE</code> is defined the functions in <code>tchar.h</code> map to the wide functions and <code>TCHAR</code> is <code>wchar_t</code>, otherwise the narrow functions are used and <code>TCHAR</code> is <code>char</code>:</p> <pre><code>_tprintf(_T("%c %s\n"), _T('a'), _T("Bcd")); </code></pre> <p>There is a similar convention used by the Windows SDK header files and the few format functions that exist there (wsprintf, wvsprintf, wnsprintf and wvnsprintf) but they are controlled by <code>UNICODE</code> and <code>TEXT</code> and not <code>_UNICODE</code> and <code>_T</code>/<code>_TEXT</code>.</p> <p>You probably have 3 choices to make a multi-platform project work on Windows if you want to support older Windows compilers:</p> <p><strong>1)</strong> Compile as a narrow string project on Windows, probably not a good idea and in your case swprintf will still treat %s as wchar_t*.</p> <p><strong>2)</strong> Use custom defines similar to how inttypes.h format strings work:</p> <pre><code>#ifdef _WIN32 #define PRIs "s" #define WPRIs L"hs" #else #define PRIs "s" #define WPRIs L"s" #endif printf("%" PRIs " World\n", "Hello"); wprintf(L"%" WPRIs L" World\n", "Hello"); </code></pre> <p><strong>3)</strong> Create your own custom version of swprintf and use it with Visual Studio 13 and earlier.</p>
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    1. POvisual studio swprintf is making all my %s formatters want wchar_t * instead of char *
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    1. POvisual studio swprintf is making all my %s formatters want wchar_t * instead of char *
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    1. COIm really not sure how to use this, in my tests when _UNICODE is defined or not defined the behaviour is the same swprintf %s expects a wchar_t and not a char*. As for the MS extensions do you know if there is a way to get gcc to use them?
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    2. COAre you sure your environment is not defining it for you (In the project settings in VS)? If by gcc you mean MinGW then yes, MinGW can use the MS C run time, see http://stackoverflow.com/questions/6729013/mingw-printf-size-specification-character-h
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    3. COno gcc on mac... In the project settings you specific the character type as 'not defined' or 'use unicode' or 'use multibyte'. If you say 'not defined' then _UNICODE is not defined, if you say 'use unicode' then _UNICODE is defined.
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