巧妙使用QMap和QMultiMap实现QT使用UDP一对多聊天

最近开发了一个Super Helpdesk的项目， 在聊天模块，使用QMap储存发送过来的用户名和ip地址，利用QMultiMap存储送过来的消息，在有聊天的时候消息自动发送到all messages并存储在Qmultimap里面，当用户双击chat list的用户时候，自动调入相应用户的聊天信息，
和IP 地址，这样就实现了不切换界面来实现一对多聊天。如何分辨用户名字，在之前的帖子里面有说，可以参考一下，这个方案只是利用了mysql存储的IP地址，去掉了聊天服务器（上线即自动update IP地址到mysql服务器）。 谢谢各位网友分享的资料。具体程序请访问
www.pavogroup.top 下载。

 

 

void EngineerWindow::on_readyRead()
{
    //是否还有待读取的传入数据报
    while(m_udpSocket->hasPendingDatagrams())
    {
        QByteArray data;
        //返回待读取的数据报的字节数
        data.resize(m_udpSocket->pendingDatagramSize());
        //        QHostAddress peerAddr;
        //        quint16 peerPort;
        //读取数据报的内容
        m_udpSocket->readDatagram(data.data(),data.size(),&peerAddr,&peerPort);
        senderPeerAddress = peerAddr;
        QString str = data.data();
        QStringList list = str.split("///");
        senderName = list.at(list.length()-1);
        strReceiveWithoutName = list.at(list.length ()-2);
        //  QString peer = "[From ] +"+peerAddr.toString()+":"+QString::number(peerPort)+"] ";
        sendTitle = "[From "+senderName+ "-" + QTime::currentTime ().toString () + "]: ";
        //  ui->plainTextEdit_Chat_Messages->appendPlainText(peer+str);
        QTextCharFormat fmt;
        //字体色
        strReceiveWithoutNameEmit = strReceiveWithoutName;
        senderNameEmit = senderName;
        senderPeerAddressEmit = senderPeerAddress;
        // QString messageForwardToChatForm = sendTitle + strReceiveWithoutName;
        //on_readyReadEmit();
        if(ui->label_ChatWithName->text ().isEmpty () || ui->label_ChatWithName->text () == senderName)
        {
            ui->label_ChatWithName->setText (senderName);
            fmt.setForeground(QBrush(Qt::blue));
            ui->plainTextEdit_Chat_Messages->mergeCurrentCharFormat(fmt);
            ui->plainTextEdit_Chat_Messages->appendPlainText(sendTitle+strReceiveWithoutName);
            dstIP = peerAddr.toString ();
        }
        if(senderName != senderNameTempForColor)
        {
            senderNameTempForColor = senderName;
            QTextCharFormat fmt;
            //字体色
            fmt.setForeground(QBrush(QColor::fromHsl(rand()%360,rand()%256,rand()%200)));
            ui->plainTextEdit_Chat_Messages_All->mergeCurrentCharFormat(fmt);
            ui->plainTextEdit_Chat_Messages_All->appendPlainText(sendTitle+strReceiveWithoutName);
        }
        else
        {
            ui->plainTextEdit_Chat_Messages_All->appendPlainText(sendTitle+strReceiveWithoutName);
        }
        QTableWidgetItem *senderItem = new QTableWidgetItem;
        senderItem->setText(senderName);
        QTableWidgetItem *peerAddrItem = new QTableWidgetItem;
        peerAddrItem->setText(peerAddr.toString ());
        ui->tableWidget_Engineer_ChatList->setRowCount(chatList.count ()+1);
        if(!chatList.contains (senderName))
        {
            chatList.insert (senderName, peerAddr);
            ui->tableWidget_Engineer_ChatList->setItem (chatListRow, chatListCol1, senderItem);
            ui->tableWidget_Engineer_ChatList->setItem (chatListRow, chatListCol2, peerAddrItem);
            chatListRow++;
        }
        else
        {
            chatList.remove (senderName);
            QTest::qSleep (20);
            chatList.insert (senderName, peerAddr);
            if(!ui->tableWidget_Engineer_ChatList->size ().isEmpty ())
            {
                for(int row = ui->tableWidget_Engineer_ChatList->rowCount()-1; row >=0; row--)
                {
                    if(ui->tableWidget_Engineer_ChatList->item(row,0)==nullptr || ui->tableWidget_Engineer_ChatList->item(row,1)->text().isEmpty())
                    {
                    }
                    else
                    {
                        QString item1 = ui->tableWidget_Engineer_ChatList->item(row,0)->text ();
                        QString item2 = ui->tableWidget_Engineer_ChatList->item(row,1)->text ();
                        if(item1 == senderName && item2 != peerAddr.toString ())
                        {
                            ui->tableWidget_Engineer_ChatList->setItem (row, chatListCol1, senderItem);
                            ui->tableWidget_Engineer_ChatList->setItem (row, chatListCol2, peerAddrItem);
                            //  chatListRow++;
                        }
                    }
                }
            }
        }
        chatMessages.insertMulti (senderName, sendTitle+strReceiveWithoutName);
        delete senderItem;
        delete peerAddrItem;
    }
}
void EngineerWindow::on_pushButton_Chat_SendMessage_clicked()
{
    if(ui->plainTextEdit_Send_Messages->document ()->isEmpty ())
    {
        QMessageBox::warning (this, "Remind", "You could not send empty message out!");
        return;
    }
    if(ui->label_ChatWithName->text ()== "")
    {
        QMessageBox::information (this, "Remind","Pls double click on the contact list to choose who are you want to talk first.");
        return;
    }
    QString chatWithName = ui->label_ChatWithName->text ();
    QHostAddress dstAddr(dstIP);
    //目标端口
    quint16 dstPort = 8686; //= ui->lineEdit_SendTo_Port->text().toInt ();
    QString msg = ui->plainTextEdit_Send_Messages->toPlainText () + "///" + WindowsUserName;
    QByteArray str = msg.toUtf8();
    //发出数据报
    m_udpSocket->writeDatagram(str,dstAddr,dstPort);
    QTextCharFormat fmt;
    //字体色
    fmt.setForeground(QBrush(Qt::darkRed));
    QString msgLocal = ui->plainTextEdit_Send_Messages->toPlainText ();
    ui->plainTextEdit_Chat_Messages->mergeCurrentCharFormat(fmt);
    ui->plainTextEdit_Chat_Messages->appendPlainText("[To " + chatWithName + "-" + QTime::currentTime ().toString () + "]: "+msgLocal);
    chatMessages.insertMulti (chatWithName, "[To " + chatWithName + "-" + QTime::currentTime ().toString () + "]: "+msgLocal);
    ui->plainTextEdit_Send_Messages->clear ();
}