必须设定locale。否则出错 代码是EILSEQ = 42 #include <string> #include <locale.h> using namespace std; string ws2s(const wstring& ws) { string curLocale = setlocale(LC_ALL, NULL); // curLocale = "C"; setlocale(LC_ALL, "chs"); const wchar_t* _Source = ws.c_str(); size_t _Dsize = 2 * ws.size() + 1; char *_Dest = new char[_Dsize]; memset(_Dest,0,_Dsize); wcstombs(_Dest,_Source,_Dsize); string result = _Dest; delete []_Dest; setlocale(LC_ALL, curLocale.c_str()); return result; } wstring s2ws(const string& s) { setlocale(LC_ALL, "chs"); const char* _Source = s.c_str(); size_t _Dsize = s.size() + 1; wchar_t *_Dest = new wchar_t[_Dsize]; wmemset(_Dest, 0, _Dsize); mbstowcs(_Dest,_Source,_Dsize); wstring result = _Dest; delete []_Dest; setlocale(LC_ALL, "C"); return result; }