ws2s函数

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