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50
51#include "sender.h"
52
53Sender::Sender(QWidget *parent)
54 : QDialog(parent),
55 groupAddress4(QStringLiteral("239.255.43.21")),
56 groupAddress6(QStringLiteral("ff12::2115"))
57{
58 // force binding to their respective families
59 udpSocket4.bind(address: QHostAddress(QHostAddress::AnyIPv4), port: 0);
60 udpSocket6.bind(address: QHostAddress(QHostAddress::AnyIPv6), port: udpSocket4.localPort());
61
62 QString msg = tr(s: "Ready to multicast datagrams to groups %1 and [%2] on port 45454").arg(a: groupAddress4.toString());
63 if (udpSocket6.state() != QAbstractSocket::BoundState)
64 msg = tr(s: "IPv6 failed. Ready to multicast datagrams to group %1 on port 45454").arg(a: groupAddress4.toString());
65 else
66 msg = msg.arg(a: groupAddress6.toString());
67 statusLabel = new QLabel(msg);
68
69 auto ttlLabel = new QLabel(tr(s: "TTL for IPv4 multicast datagrams:"));
70 auto ttlSpinBox = new QSpinBox;
71 ttlSpinBox->setRange(min: 0, max: 255);
72
73 auto ttlLayout = new QHBoxLayout;
74 ttlLayout->addWidget(ttlLabel);
75 ttlLayout->addWidget(ttlSpinBox);
76
77 startButton = new QPushButton(tr(s: "&Start"));
78 auto quitButton = new QPushButton(tr(s: "&Quit"));
79
80 auto buttonBox = new QDialogButtonBox;
81 buttonBox->addButton(button: startButton, role: QDialogButtonBox::ActionRole);
82 buttonBox->addButton(button: quitButton, role: QDialogButtonBox::RejectRole);
83
84 connect(sender: ttlSpinBox, signal: QOverload<int>::of(ptr: &QSpinBox::valueChanged), receiver: this, slot: &Sender::ttlChanged);
85 connect(sender: startButton, signal: &QPushButton::clicked, receiver: this, slot: &Sender::startSending);
86 connect(sender: quitButton, signal: &QPushButton::clicked, receiver: this, slot: &Sender::close);
87 connect(sender: &timer, signal: &QTimer::timeout, receiver: this, slot: &Sender::sendDatagram);
88
89 auto mainLayout = new QVBoxLayout;
90 mainLayout->addWidget(statusLabel);
91 mainLayout->addLayout(layout: ttlLayout);
92 mainLayout->addWidget(buttonBox);
93 setLayout(mainLayout);
94
95 setWindowTitle(tr(s: "Multicast Sender"));
96 ttlSpinBox->setValue(1);
97}
98
99void Sender::ttlChanged(int newTtl)
100{
101 // we only set the TTL on the IPv4 socket, as that changes the multicast scope
102 udpSocket4.setSocketOption(option: QAbstractSocket::MulticastTtlOption, value: newTtl);
103}
104
105void Sender::startSending()
106{
107 startButton->setEnabled(false);
108 timer.start(msec: 1000);
109}
110
111void Sender::sendDatagram()
112{
113 statusLabel->setText(tr(s: "Now sending datagram %1").arg(a: messageNo));
114 QByteArray datagram = "Multicast message " + QByteArray::number(messageNo);
115 udpSocket4.writeDatagram(datagram, host: groupAddress4, port: 45454);
116 if (udpSocket6.state() == QAbstractSocket::BoundState)
117 udpSocket6.writeDatagram(datagram, host: groupAddress6, port: 45454);
118 ++messageNo;
119}
120

source code of qtbase/examples/network/multicastsender/sender.cpp