C++ std::string和std::wstring转换方法

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;

}