std::string ws2s(const std::wstring& str){    char*     pElementText;    int    iTextLen;    // wide char to multi char    iTextLen = WideCharToMultiByte(CP_ACP, 0, str.c_str(), -1, NULL, 0, NULL, NULL);    pElementText = new char[iTextLen + 1];    memset((void*)pElementText, 0, sizeof(char)* (iTextLen + 1));    ::WideCharToMultiByte(CP_ACP, 0, str.c_str(), -1, pElementText, iTextLen, NULL, NULL);    std::string strText;    strText = pElementText;    delete[] pElementText;    return strText;}

std::string strKEy = ws2s(pKey);//pKey为WCHAR类型    char pStr[256] = {
   0};    strcpy_s(pStr, 256, strKEy.c_str());