string MyUTF_8toGB2312(string str)

{

    int changdu = MultiByteToWideChar(,,str.c_str(),-,NULL,);

    wchar_t* IUnicode = new wchar_t[changdu*];

    MultiByteToWideChar(,,str.c_str(),-,IUnicode,changdu);

    changdu = WideCharToMultiByte(,,IUnicode,-,NULL,,,);

    char* Ichar = new char[changdu*];

    WideCharToMultiByte(,,IUnicode,-,Ichar,changdu*,,);

    string temp = Ichar;

    delete []IUnicode;

    IUnicode=NULL;

    delete []Ichar;

    Ichar=NULL;

    return temp;

}