Qt多网卡组播问题解决方法

#include "multicast.h" #include "ui_multicast.h" #include <QtNetwork/QNetworkInterface> #include <QSettings> Multicast::Multicast(QWidget *parent) : QDialog(parent), ui(new Ui::Multicast) { ui->setupUi(this); QList<QNetworkInterface> &lni = QNetworkInterface::allInterfaces(); for (int i = 0; i < lni.size(); i++) { ui->comboBoxNetwork->addItem(lni[i].humanReadableName()); } QSettings settings("XxTec", "Multicast"); settings.beginGroup("Multicast"); ui->comboBoxNetwork->setCurrentText(settings.value("NetworkCard").toString()); ui->lineEditGroupIP->setText(settings.value("Group").toString()); ui->spinBoxPort->setValue(settings.value("Port").toInt()); ui->spinBoxPeerPort->setValue(settings.value("PeerPort").toInt()); } Multicast::~Multicast() { delete ui; } void Multicast::readPendingDatagrams() { while (m_UdpSocket.hasPendingDatagrams()) { qint64 nTime = *(qint64*)m_UdpSocket.receiveDatagram().data().data(); ui->dateTimeEdit->setDateTime(QDateTime::fromSecsSinceEpoch(nTime)); } } void Multicast::on_pushButtonInit_clicked() { QSettings settings("XxTec", "Multicast"); settings.beginGroup("Multicast"); settings.setValue("NetworkCard", ui->comboBoxNetwork->currentText()); settings.setValue("Group", ui->lineEditGroupIP->text()); settings.setValue("Port", ui->spinBoxPort->value()); settings.setValue("PeerPort", ui->spinBoxPeerPort->value()); QString strMulticastNetworkCard = settings.value("NetworkCard").toString(); QString strGroup = settings.value("Group").toString(); short nPort = settings.value("Port").toInt(); short nPeerPort = settings.value("PeerPort").toInt(); int nIndex = 0; const QList<QNetworkInterface> &lni = QNetworkInterface::allInterfaces(); for (int i = 0; i < lni.size(); i++) { if (lni[i].humanReadableName().indexOf(strMulticastNetworkCard) >= 0) { nIndex = i; break; } } QHostAddress groupAddr(strGroup); m_Datagram.setDestination(groupAddr, nPeerPort); bool b = m_UdpSocket.bind(QHostAddress::AnyIPv4, nPort, QUdpSocket::ShareAddress | QUdpSocket::ReuseAddressHint); //多网卡时为了能够建立正确的组播路由，必须先设置组播网卡setMulticastInterface，再加入组播组joinMulticastGroup， //并且加入组播的同时指定网卡joinMulticastGroup(groupAddr, lni[nIndex]) m_UdpSocket.setMulticastInterface(lni[nIndex]); b = m_UdpSocket.joinMulticastGroup(groupAddr, lni[nIndex]); connect(&m_UdpSocket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams())); } void Multicast::on_pushButtonStart_clicked() { unsigned char ucCmd = 0; QByteArray ba((char*)&ucCmd, sizeof(ucCmd)); m_Datagram.setData(ba); m_UdpSocket.writeDatagram(m_Datagram); } void Multicast::on_pushButtonStop_clicked() { unsigned char ucCmd = 1; QByteArray ba((char*)&ucCmd, sizeof(ucCmd)); m_Datagram.setData(ba); int kk = m_UdpSocket.writeDatagram(m_Datagram); }