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copied!<p>You shouldn't need to set your locale or set any special modes on the file if you just want to use fprintf. You simply have to use UTF-8 encoded strings.</p> <pre><code>#include <cstdio> #include <codecvt> int main() { std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t> convert; std::string utf8_string = convert.to_bytes(L"кошка 日本国"); if(FILE *f = fopen("tmp","w")) fprintf(f,"%s\n",utf8_string.c_str()); } </code></pre> <p>Save the program as UTF-8 with signature or UTF-16 (i.e. don't use UTF-8 without signature, otherwise VS won't produce the right string literal). The file written by the program will contain the UTF-8 version of that string. Or you can do:</p> <pre><code>int main() { if(FILE *f = fopen("tmp","w")) fprintf(f,"%s\n","кошка 日本国"); } </code></pre> <p>In this case you must save the file as UTF-8 <em>without</em> signature, because you want the compiler to think the source encoding is the same as the execution encoding... This is a bit of a hack that relies on the compiler's, IMO, broken behavior.</p> <p>You can do basically the same thing with any of the other APIs for writing narrow characters to a file, but note that none of these methods work for writing UTF-8 to the Windows console. Because the C runtime and/or the console is a bit broken you can only write UTF-8 directly to the console by doing SetConsoleOutputCP(65001) and then using one of the <code>puts</code> variety of function.</p> <p>If you want to use wide characters instead of narrow characters then locale based methods and setting modes on file descriptors could come into play.</p> <pre><code>#include <cstdio> #include <fcntl.h> #include <io.h> int main() { if(FILE *f = fopen("tmp","w")) { _setmode(_fileno(f), _O_U8TEXT); fwprintf(f,L"%s\n",L"кошка 日本国"); } } </code></pre> <hr> <pre><code>#include <fstream> #include <codecvt> int main() { if(auto f = std::wofstream("tmp")) { f.imbue(std::locale(std::locale(), new std::codecvt_utf8_utf16<wchar_t>)); // assumes wchar_t is UTF-16 f << L"кошка 日本国\n"; } } </code></pre>

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