C++ string和wstring互转实现

　　[转载] http://www.cppblog.com/kenwell/archive/2008/05/21/50661.html  很好，很强大，用到就是赚到！

　　代码如下：

 #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 =  * ws.size() + ;
     char *_Dest = new char[_Dsize];
     memset(_Dest,,_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");
     const char* _Source = s.c_str();
     size_t _Dsize = s.size() + ;
     wchar_t *_Dest = new wchar_t[_Dsize];
     wmemset(_Dest, , _Dsize);
     mbstowcs(_Dest,_Source,_Dsize);
     std::wstring result = _Dest;
     delete []_Dest;
     setlocale(LC_ALL, "C");
     return result;
 }