sender.cpp Example File

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#include "sender.h" Sender::Sender(QWidget *parent) : QDialog(parent), groupAddress4(QStringLiteral("")), groupAddress6(QStringLiteral("ff12::2115")) { // force binding to their respective families udpSocket4.bind(QHostAddress(QHostAddress::AnyIPv4), 0); udpSocket6.bind(QHostAddress(QHostAddress::AnyIPv6), udpSocket4.localPort()); QString msg = tr("Ready to multicast datagrams to groups %1 and [%2] on port 45454").arg(groupAddress4.toString()); if (udpSocket6.state() != QAbstractSocket::BoundState) msg = tr("IPv6 failed. Ready to multicast datagrams to group %1 on port 45454").arg(groupAddress4.toString()); else msg = msg.arg(groupAddress6.toString()); statusLabel = new QLabel(msg); auto ttlLabel = new QLabel(tr("TTL for IPv4 multicast datagrams:")); auto ttlSpinBox = new QSpinBox; ttlSpinBox->setRange(0, 255); auto ttlLayout = new QHBoxLayout; ttlLayout->addWidget(ttlLabel); ttlLayout->addWidget(ttlSpinBox); startButton = new QPushButton(tr("&Start")); auto quitButton = new QPushButton(tr("&Quit")); auto buttonBox = new QDialogButtonBox; buttonBox->addButton(startButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); connect(ttlSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &Sender::ttlChanged); connect(startButton, &QPushButton::clicked, this, &Sender::startSending); connect(quitButton, &QPushButton::clicked, this, &Sender::close); connect(&timer, &QTimer::timeout, this, &Sender::sendDatagram); auto mainLayout = new QVBoxLayout; mainLayout->addWidget(statusLabel); mainLayout->addLayout(ttlLayout); mainLayout->addWidget(buttonBox); setLayout(mainLayout); setWindowTitle(tr("Multicast Sender")); ttlSpinBox->setValue(1); } void Sender::ttlChanged(int newTtl) { // we only set the TTL on the IPv4 socket, as that changes the multicast scope udpSocket4.setSocketOption(QAbstractSocket::MulticastTtlOption, newTtl); } void Sender::startSending() { startButton->setEnabled(false); timer.start(1000); } void Sender::sendDatagram() { statusLabel->setText(tr("Now sending datagram %1").arg(messageNo)); QByteArray datagram = "Multicast message " + QByteArray::number(messageNo); udpSocket4.writeDatagram(datagram, groupAddress4, 45454); if (udpSocket6.state() == QAbstractSocket::BoundState) udpSocket6.writeDatagram(datagram, groupAddress6, 45454); ++messageNo; }

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