QString** str = new QString*[6];
    int length = _msize(str) / sizeof(*str);
    qDebug()<<length;
    for (int i=0;i<length;i++){
        str[i] = new QString[4];
        str[i][0] = "port_name_en";
        str[i][1] = "port_name_cn";
        str[i][2] = "longitude_decimal";
        str[i][3] = "latitude_decimal";
    }
    for (int i=0;i<length;i++){
        qDebug()<<str[i][0]<<str[i][1]<<str[i][2]<<str[i][3];
    }

?