qt如何在每个网口广播发送信息并且接收信息

void SearchDialog::setRemainTime(int time)
{
    remainTime = time;
    searchResult = 0;
    QString strText = tr("Found %1 NPort(s) ,remain timeout = %2 second(s) ").arg(searchResult).arg(remainTime);
    ui->findLabel->setText(strText);
    _timer.start(1000);
    QByteArray byteArr = QByteArray("\x01\x00\x00\x08\x00\x00\x00\x00",8);
    QHash<QString, QUdpSocket*>::const_iterator i;
    for(i=mUdpClients.constBegin();i!=mUdpClients.constEnd();i++){
        QUdpSocket *client = i.value();
        QString broadIp = i.key();
        client->writeDatagram(byteArr, QHostAddress(broadIp),4800);
    }
}
void SearchDialog::initSocket()
{
    QList<QNetworkInterface> ifaceList = QNetworkInterface::allInterfaces();
    //获取系统里所有的网络接口
    foreach(QNetworkInterface intf, ifaceList){ //遍历所有接口
        foreach(QNetworkAddressEntry entry, intf.addressEntries()){
            //intf.addressEntries()返回此接口拥有的IP地址列表及其相关的网掩码和广播地址。
            if(entry.ip().isLoopback() == true){
                continue;
            }
            else{
                if(entry.ip().protocol() !=QAbstractSocket::IPv4Protocol)
                    continue;
                else{
                    QString name = intf.humanReadableName();
                    QString strIp = entry.ip().toString();
                    hash.insert(name, strIp);
                    udpClient = new QUdpSocket(this);
                    QHostAddress networkcardip(strIp);
                    udpClient->bind(networkcardip, 4800,QAbstractSocket::DontShareAddress);
                    connect(udpClient,SIGNAL(readyRead()),
                            this,SLOT(readPendingDatagrams()));
                    mUdpClients.insert(entry.broadcast().toString(),udpClient);
                }
            }
        }

    }
}