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50
51#include <QtWidgets>
52#include <QtNetwork>
53
54#include "receiver.h"
55
56Receiver::Receiver(QWidget *parent)
57 : QDialog(parent),
58 groupAddress4(QStringLiteral("239.255.43.21")),
59 groupAddress6(QStringLiteral("ff12::2115"))
60{
61 statusLabel = new QLabel(tr(s: "Listening for multicast messages on both IPv4 and IPv6"));
62 auto quitButton = new QPushButton(tr(s: "&Quit"));
63
64 auto buttonLayout = new QHBoxLayout;
65 buttonLayout->addStretch(stretch: 1);
66 buttonLayout->addWidget(quitButton);
67 buttonLayout->addStretch(stretch: 1);
68
69 auto mainLayout = new QVBoxLayout;
70 mainLayout->addWidget(statusLabel);
71 mainLayout->addLayout(layout: buttonLayout);
72 setLayout(mainLayout);
73
74 setWindowTitle(tr(s: "Multicast Receiver"));
75
76 udpSocket4.bind(address: QHostAddress::AnyIPv4, port: 45454, mode: QUdpSocket::ShareAddress);
77 udpSocket4.joinMulticastGroup(groupAddress: groupAddress4);
78
79 if (!udpSocket6.bind(address: QHostAddress::AnyIPv6, port: 45454, mode: QUdpSocket::ShareAddress) ||
80 !udpSocket6.joinMulticastGroup(groupAddress: groupAddress6))
81 statusLabel->setText(tr(s: "Listening for multicast messages on IPv4 only"));
82
83 connect(sender: &udpSocket4, signal: &QUdpSocket::readyRead,
84 receiver: this, slot: &Receiver::processPendingDatagrams);
85 connect(sender: &udpSocket6, signal: &QUdpSocket::readyRead,
86 receiver: this, slot: &Receiver::processPendingDatagrams);
87 connect(sender: quitButton, signal: &QPushButton::clicked,
88 receiver: this, slot: &Receiver::close);
89}
90
91void Receiver::processPendingDatagrams()
92{
93 QByteArray datagram;
94
95 // using QUdpSocket::readDatagram (API since Qt 4)
96 while (udpSocket4.hasPendingDatagrams()) {
97 datagram.resize(size: int(udpSocket4.pendingDatagramSize()));
98 udpSocket4.readDatagram(data: datagram.data(), maxlen: datagram.size());
99 statusLabel->setText(tr(s: "Received IPv4 datagram: \"%1\"")
100 .arg(a: datagram.constData()));
101 }
102
103 // using QUdpSocket::receiveDatagram (API since Qt 5.8)
104 while (udpSocket6.hasPendingDatagrams()) {
105 QNetworkDatagram dgram = udpSocket6.receiveDatagram();
106 statusLabel->setText(statusLabel->text() +
107 tr(s: "\nReceived IPv6 datagram from [%2]:%3: \"%1\"")
108 .arg(args: dgram.data().constData(), args: dgram.senderAddress().toString())
109 .arg(a: dgram.senderPort()));
110 }
111}
112

source code of qtbase/examples/network/multicastreceiver/receiver.cpp