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++ // Copyright (C) 2017 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "sender.h"
++
++ Sender::Sender(QWidget *parent)
++ : QDialog(parent),
++ groupAddress4(QStringLiteral("239.255.43.21")),
++ 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, &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;
++ }