json \u unicode字符串转化 c++

CString GetUStr(const string & str)

{

    std::string showname = str;//\u6211\u7231\u5317\u4eac\u5929\u5b89\u95e8

    int len=strlen(showname.c_str())+;

    char outch[MAX_PATH];

    WCHAR * wChar=new WCHAR[len];

    wmemset(wChar,,len);

    MultiByteToWideChar(CP_UTF8, , showname.c_str(), len, wChar, len);

    CString strRet = wChar;//转化结果 我爱北京天安门

    delete [] wChar;

    return strRet;

}