qt 6.5.1 original

examples/network/multicastreceiver/CMakeLists.txt

@@ -0,0 +1,38 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(multicastreceiver LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/network/multicastreceiver")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Network Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(multicastreceiver
+    main.cpp
+    receiver.cpp receiver.h
+)
+
+set_target_properties(multicastreceiver PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(multicastreceiver PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Network
+    Qt6::Widgets
+)
+
+install(TARGETS multicastreceiver
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/network/multicastreceiver/main.cpp

@@ -0,0 +1,14 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+
+#include "receiver.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    Receiver receiver;
+    receiver.show();
+    return app.exec();
+}

examples/network/multicastreceiver/multicastreceiver.pro

@@ -0,0 +1,11 @@
+QT += network widgets
+requires(qtConfig(udpsocket))
+
+HEADERS       = receiver.h
+SOURCES       = receiver.cpp \
+                main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/network/multicastreceiver
+INSTALLS += target
+

examples/network/multicastreceiver/receiver.cpp

@@ -0,0 +1,64 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+#include <QtNetwork>
+
+#include "receiver.h"
+
+Receiver::Receiver(QWidget *parent)
+    : QDialog(parent),
+      groupAddress4(QStringLiteral("239.255.43.21")),
+      groupAddress6(QStringLiteral("ff12::2115"))
+{
+    statusLabel = new QLabel(tr("Listening for multicast messages on both IPv4 and IPv6"));
+    auto quitButton = new QPushButton(tr("&Quit"));
+
+    auto buttonLayout = new QHBoxLayout;
+    buttonLayout->addStretch(1);
+    buttonLayout->addWidget(quitButton);
+    buttonLayout->addStretch(1);
+
+    auto mainLayout = new QVBoxLayout;
+    mainLayout->addWidget(statusLabel);
+    mainLayout->addLayout(buttonLayout);
+    setLayout(mainLayout);
+
+    setWindowTitle(tr("Multicast Receiver"));
+
+    udpSocket4.bind(QHostAddress::AnyIPv4, 45454, QUdpSocket::ShareAddress);
+    udpSocket4.joinMulticastGroup(groupAddress4);
+
+    if (!udpSocket6.bind(QHostAddress::AnyIPv6, 45454, QUdpSocket::ShareAddress) ||
+            !udpSocket6.joinMulticastGroup(groupAddress6))
+        statusLabel->setText(tr("Listening for multicast messages on IPv4 only"));
+
+    connect(&udpSocket4, &QUdpSocket::readyRead,
+            this, &Receiver::processPendingDatagrams);
+    connect(&udpSocket6, &QUdpSocket::readyRead,
+            this, &Receiver::processPendingDatagrams);
+    connect(quitButton, &QPushButton::clicked,
+            qApp, &QCoreApplication::quit);
+}
+
+void Receiver::processPendingDatagrams()
+{
+    QByteArray datagram;
+
+    // using QUdpSocket::readDatagram (API since Qt 4)
+    while (udpSocket4.hasPendingDatagrams()) {
+        datagram.resize(qsizetype(udpSocket4.pendingDatagramSize()));
+        udpSocket4.readDatagram(datagram.data(), datagram.size());
+        statusLabel->setText(tr("Received IPv4 datagram: \"%1\"")
+                             .arg(datagram.constData()));
+    }
+
+    // using QUdpSocket::receiveDatagram (API since Qt 5.8)
+    while (udpSocket6.hasPendingDatagrams()) {
+        QNetworkDatagram dgram = udpSocket6.receiveDatagram();
+        statusLabel->setText(statusLabel->text() +
+                             tr("\nReceived IPv6 datagram from [%2]:%3: \"%1\"")
+                             .arg(dgram.data().constData(), dgram.senderAddress().toString())
+                             .arg(dgram.senderPort()));
+    }
+}

examples/network/multicastreceiver/receiver.h

@@ -0,0 +1,33 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef RECEIVER_H
+#define RECEIVER_H
+
+#include <QDialog>
+#include <QHostAddress>
+#include <QUdpSocket>
+
+QT_BEGIN_NAMESPACE
+class QLabel;
+QT_END_NAMESPACE
+
+class Receiver : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit Receiver(QWidget *parent = nullptr);
+
+private slots:
+    void processPendingDatagrams();
+
+private:
+    QLabel *statusLabel = nullptr;
+    QUdpSocket udpSocket4;
+    QUdpSocket udpSocket6;
+    QHostAddress groupAddress4;
+    QHostAddress groupAddress6;
+};
+
+#endif