c++ string 和wstring 之间的互相转换函数

#include <string>
std::string ws2s(const std::wstring& ws)
{
   std::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 =newchar[_Dsize];
   memset(_Dest,0,_Dsize);
   wcstombs(_Dest,_Source,_Dsize);
   std::string result = _Dest;
   delete []_Dest;
   setlocale(LC_ALL, curLocale.c_str());
return result;
}

std::wstring s2ws(const std::string& s)
{
   setlocale(LC_ALL, "chs");
constchar* _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);
   std::wstring result = _Dest;
   delete []_Dest;
   setlocale(LC_ALL, "C");
return result;
}