<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>receiver.cpp Example File | Qt Network 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-multicastreceiver-example.html">Multicast Receiver Example</a></td><td >receiver.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtnetwork-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">receiver.cpp Example File</h1> <span class="subtitle">multicastreceiver/receiver.cpp</span> <!-- $$$multicastreceiver/receiver.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include <QtWidgets></span> <span class="preprocessor">#include <QtNetwork></span> <span class="preprocessor">#include "receiver.h"</span> Receiver<span class="operator">::</span>Receiver(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QDialog</span>(parent)<span class="operator">,</span> groupAddress4(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"239.255.43.21"</span>))<span class="operator">,</span> groupAddress6(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"ff12::2115"</span>)) { statusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLabel</span>(tr(<span class="string">"Listening for multicast messages on both IPv4 and IPv6"</span>)); <span class="keyword">auto</span> quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(tr(<span class="string">"&Quit"</span>)); <span class="keyword">auto</span> buttonLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QHBoxLayout</span>; buttonLayout<span class="operator">-</span><span class="operator">></span>addStretch(<span class="number">1</span>); buttonLayout<span class="operator">-</span><span class="operator">></span>addWidget(quitButton); buttonLayout<span class="operator">-</span><span class="operator">></span>addStretch(<span class="number">1</span>); <span class="keyword">auto</span> mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>; mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(statusLabel); mainLayout<span class="operator">-</span><span class="operator">></span>addLayout(buttonLayout); setLayout(mainLayout); setWindowTitle(tr(<span class="string">"Multicast Receiver"</span>)); udpSocket4<span class="operator">.</span>bind(<span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>AnyIPv4<span class="operator">,</span> <span class="number">45454</span><span class="operator">,</span> <span class="type"><a href="qudpsocket.html">QUdpSocket</a></span><span class="operator">::</span>ShareAddress); udpSocket4<span class="operator">.</span>joinMulticastGroup(groupAddress4); <span class="keyword">if</span> (<span class="operator">!</span>udpSocket6<span class="operator">.</span>bind(<span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>AnyIPv6<span class="operator">,</span> <span class="number">45454</span><span class="operator">,</span> <span class="type"><a href="qudpsocket.html">QUdpSocket</a></span><span class="operator">::</span>ShareAddress) <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>udpSocket6<span class="operator">.</span>joinMulticastGroup(groupAddress6)) statusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Listening for multicast messages on IPv4 only"</span>)); connect(<span class="operator">&</span>udpSocket4<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(processPendingDatagrams())); connect(<span class="operator">&</span>udpSocket6<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qudpsocket.html">QUdpSocket</a></span><span class="operator">::</span>readyRead<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Receiver<span class="operator">::</span>processPendingDatagrams); connect(quitButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close())); } <span class="type">void</span> Receiver<span class="operator">::</span>processPendingDatagrams() { <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> datagram; <span class="comment">// using QUdpSocket::readDatagram (API since Qt 4)</span> <span class="keyword">while</span> (udpSocket4<span class="operator">.</span>hasPendingDatagrams()) { datagram<span class="operator">.</span>resize(<span class="type">int</span>(udpSocket4<span class="operator">.</span>pendingDatagramSize())); udpSocket4<span class="operator">.</span>readDatagram(datagram<span class="operator">.</span>data()<span class="operator">,</span> datagram<span class="operator">.</span>size()); statusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Received IPv4 datagram: \"%1\""</span>) <span class="operator">.</span>arg(datagram<span class="operator">.</span>constData())); } <span class="comment">// using QUdpSocket::receiveDatagram (API since Qt 5.8)</span> <span class="keyword">while</span> (udpSocket6<span class="operator">.</span>hasPendingDatagrams()) { <span class="type"><a href="qnetworkdatagram.html">QNetworkDatagram</a></span> dgram <span class="operator">=</span> udpSocket6<span class="operator">.</span>receiveDatagram(); statusLabel<span class="operator">-</span><span class="operator">></span>setText(statusLabel<span class="operator">-</span><span class="operator">></span>text() <span class="operator">+</span> tr(<span class="string">"\nReceived IPv6 datagram from [%2]:%3: \"%1\""</span>) <span class="operator">.</span>arg(dgram<span class="operator">.</span>data()<span class="operator">.</span>constData()<span class="operator">,</span> dgram<span class="operator">.</span>senderAddress()<span class="operator">.</span>toString()) <span class="operator">.</span>arg(dgram<span class="operator">.</span>senderPort())); } } </pre> </div> <!-- @@@multicastreceiver/receiver.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>