Qt QList<T>和QDataStream一起使用问题

Question

发送：

            QList<MyVariant> friend_List;
            QList<MyGrpupVariant> group_List;        
            db->getFriendInfo(id,friend_List);
            db->getUserGroup(id,group_List);
            msgType = "LOGIN_SUCCEED";
            out << (quint16)0 << msgType<<userName<<friend_List<<group_List;
        }
        out.device()->seek(0);
        out << (quint16)(block.size() - sizeof(quint16));
        tcpSocket->write(block);

接受：

    QByteArray block = tcpSocket->readAll();
    QDataStream in(&block,QIODevice::ReadOnly);
    quint16 dataGramSize;
    QString msgType;
    in >> dataGramSize >> msgType;
    qDebug()<<msgType;
    if(msgType == "LOGIN_SUCCEED")
    {
        QString userName;
        QList<myVariant> friend_list;
        QList<MyGrpupVariant> group_list;
        in>>userName>>friend_list>>group_list;
        emit login_succeed(userName,friend_list,group_list);
    }

    打印出来friend_list为空

Answer 1

QList不用指定类型吗？