宽字符 单字符互转

string _w2s(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 _s2w( 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);std::wstring result = _Dest;delete []_Dest;setlocale(LC_ALL, "C");return result;}

void c2w(wchar_t *pwstr,size_t len,const char *str){    if(str)    {        size_t nu = strlen(str);        size_t n =(size_t)MultiByteToWideChar(CP_ACP,0,(const char *)str,(int)nu,NULL,0);        if(n>=len)n=len-1;        MultiByteToWideChar(CP_ACP,0,(const char *)str,(int)nu,pwstr,(int)n);        pwstr[n]=0;    }}char *w2c(char *pcstr,const wchar_t *pwstr, size_t len){    int nlength=wcslen(pwstr);    int nbytes = WideCharToMultiByte( 0, 0, pwstr, nlength, NULL, 0,NULL,NULL );    if(nbytes>len)        nbytes=len;    WideCharToMultiByte( 0, 0, pwstr,nlength, pcstr, nbytes, NULL, NULL );    return pcstr ;}