std::wstring s2ws(const std::string& str) { int size_needed = MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), NULL, 0); std::wstring wstrTo( size_needed, 0 ); MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), &wstrTo[0], size_needed); return wstrTo; }