qt 6.5.1 original

examples/network/multicastsender/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(multicastsender LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/network/multicastsender")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Network Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(multicastsender
+    main.cpp
+    sender.cpp sender.h
+)
+
+set_target_properties(multicastsender PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(multicastsender PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Network
+    Qt6::Widgets
+)
+
+install(TARGETS multicastsender
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/network/multicastsender/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+
+#include "sender.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    Sender sender;
+    sender.show();
+    return app.exec();
+}

examples/network/multicastsender/multicastsender.pro

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+HEADERS       = sender.h
+SOURCES       = sender.cpp \
+                main.cpp
+QT           += network widgets
+requires(qtConfig(udpsocket))
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/network/multicastsender
+INSTALLS += target
+

examples/network/multicastsender/sender.cpp

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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;
+}

examples/network/multicastsender/sender.h

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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef SENDER_H
+#define SENDER_H
+
+#include <QtWidgets>
+#include <QtNetwork>
+#include <QtCore>
+
+class Sender : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit Sender(QWidget *parent = nullptr);
+
+private slots:
+    void ttlChanged(int newTtl);
+    void startSending();
+    void sendDatagram();
+
+private:
+    QLabel *statusLabel = nullptr;
+    QPushButton *startButton = nullptr;
+    QUdpSocket udpSocket4;
+    QUdpSocket udpSocket6;
+    QTimer timer;
+    QHostAddress groupAddress4;
+    QHostAddress groupAddress6;
+    int messageNo = 1;
+};
+
+#endif