receiver.cpp 范例文件

multicastreceiver/receiver.cpp
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#include <QtWidgets> #include <QtNetwork> #include "receiver.h" Receiver::Receiver(QWidget *parent) : QDialog(parent), groupAddress4(QStringLiteral("239.255.43.21")), groupAddress6(QStringLiteral("ff12::2115")) { statusLabel = new QLabel(tr("Listening for multicast messages on both IPv4 and IPv6")); auto quitButton = new QPushButton(tr("&Quit")); auto buttonLayout = new QHBoxLayout; buttonLayout->addStretch(1); buttonLayout->addWidget(quitButton); buttonLayout->addStretch(1); auto mainLayout = new QVBoxLayout; mainLayout->addWidget(statusLabel); mainLayout->addLayout(buttonLayout); setLayout(mainLayout); setWindowTitle(tr("Multicast Receiver")); udpSocket4.bind(QHostAddress::AnyIPv4, 45454, QUdpSocket::ShareAddress); udpSocket4.joinMulticastGroup(groupAddress4); if (!udpSocket6.bind(QHostAddress::AnyIPv6, 45454, QUdpSocket::ShareAddress) || !udpSocket6.joinMulticastGroup(groupAddress6)) statusLabel->setText(tr("Listening for multicast messages on IPv4 only")); connect(&udpSocket4, SIGNAL(readyRead()), this, SLOT(processPendingDatagrams())); connect(&udpSocket6, &QUdpSocket::readyRead, this, &Receiver::processPendingDatagrams); connect(quitButton, SIGNAL(clicked()), this, SLOT(close())); } void Receiver::processPendingDatagrams() { QByteArray datagram; // using QUdpSocket::readDatagram (API since Qt 4) while (udpSocket4.hasPendingDatagrams()) { datagram.resize(int(udpSocket4.pendingDatagramSize())); udpSocket4.readDatagram(datagram.data(), datagram.size()); statusLabel->setText(tr("Received IPv4 datagram: \"%1\"") .arg(datagram.constData())); } // using QUdpSocket::receiveDatagram (API since Qt 5.8) while (udpSocket6.hasPendingDatagrams()) { QNetworkDatagram dgram = udpSocket6.receiveDatagram(); statusLabel->setText(statusLabel->text() + tr("\nReceived IPv6 datagram from [%2]:%3: \"%1\"") .arg(dgram.data().constData(), dgram.senderAddress().toString()) .arg(dgram.senderPort())); } }