<?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>peermanager.cpp Example File | Qt Network 5.9</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 5.9</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-network-chat-example.html">Network Chat Example</a></td><td >peermanager.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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">peermanager.cpp Example File</h1> <span class="subtitle">network-chat/peermanager.cpp</span> <!-- $$$network-chat/peermanager.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 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 <QtNetwork></span> <span class="preprocessor">#include "client.h"</span> <span class="preprocessor">#include "connection.h"</span> <span class="preprocessor">#include "peermanager.h"</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qint32-typedef">qint32</a></span> BroadcastInterval <span class="operator">=</span> <span class="number">2000</span>; <span class="keyword">static</span> <span class="keyword">const</span> <span class="type">unsigned</span> broadcastPort <span class="operator">=</span> <span class="number">45000</span>; PeerManager<span class="operator">::</span>PeerManager(Client <span class="operator">*</span>client) : <span class="type"><a href="../qtcore/qobject.html">QObject</a></span>(client) { <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>client <span class="operator">=</span> client; <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> envVariables; envVariables <span class="operator"><</span><span class="operator"><</span> <span class="string">"USERNAME"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"USER"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"USERDOMAIN"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"HOSTNAME"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"DOMAINNAME"</span>; <span class="type"><a href="../qtcore/qprocessenvironment.html">QProcessEnvironment</a></span> environment <span class="operator">=</span> <span class="type"><a href="../qtcore/qprocessenvironment.html">QProcessEnvironment</a></span><span class="operator">::</span>systemEnvironment(); foreach (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> string<span class="operator">,</span> envVariables) { <span class="keyword">if</span> (environment<span class="operator">.</span>contains(string)) { username <span class="operator">=</span> environment<span class="operator">.</span>value(string)<span class="operator">.</span>toUtf8(); <span class="keyword">break</span>; } } <span class="keyword">if</span> (username<span class="operator">.</span>isEmpty()) username <span class="operator">=</span> <span class="string">"unknown"</span>; updateAddresses(); serverPort <span class="operator">=</span> <span class="number">0</span>; broadcastSocket<span class="operator">.</span>bind(<span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>Any<span class="operator">,</span> broadcastPort<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="type"><a href="qudpsocket.html">QUdpSocket</a></span><span class="operator">::</span>ReuseAddressHint); connect(<span class="operator">&</span>broadcastSocket<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(readBroadcastDatagram())); broadcastTimer<span class="operator">.</span>setInterval(BroadcastInterval); connect(<span class="operator">&</span>broadcastTimer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(sendBroadcastDatagram())); } <span class="type">void</span> PeerManager<span class="operator">::</span>setServerPort(<span class="type">int</span> port) { serverPort <span class="operator">=</span> port; } <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> PeerManager<span class="operator">::</span>userName() <span class="keyword">const</span> { <span class="keyword">return</span> username; } <span class="type">void</span> PeerManager<span class="operator">::</span>startBroadcasting() { broadcastTimer<span class="operator">.</span>start(); } bool PeerManager<span class="operator">::</span>isLocalHostAddress(<span class="keyword">const</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> <span class="operator">&</span>address) { foreach (<span class="type"><a href="qhostaddress.html">QHostAddress</a></span> localAddress<span class="operator">,</span> ipAddresses) { <span class="keyword">if</span> (address <span class="operator">=</span><span class="operator">=</span> localAddress) <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="keyword">return</span> <span class="keyword">false</span>; } <span class="type">void</span> PeerManager<span class="operator">::</span>sendBroadcastDatagram() { <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> datagram(username); datagram<span class="operator">.</span>append(<span class="char">'@'</span>); datagram<span class="operator">.</span>append(<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">::</span>number(serverPort)); bool validBroadcastAddresses <span class="operator">=</span> <span class="keyword">true</span>; foreach (<span class="type"><a href="qhostaddress.html">QHostAddress</a></span> address<span class="operator">,</span> broadcastAddresses) { <span class="keyword">if</span> (broadcastSocket<span class="operator">.</span>writeDatagram(datagram<span class="operator">,</span> address<span class="operator">,</span> broadcastPort) <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) validBroadcastAddresses <span class="operator">=</span> <span class="keyword">false</span>; } <span class="keyword">if</span> (<span class="operator">!</span>validBroadcastAddresses) updateAddresses(); } <span class="type">void</span> PeerManager<span class="operator">::</span>readBroadcastDatagram() { <span class="keyword">while</span> (broadcastSocket<span class="operator">.</span>hasPendingDatagrams()) { <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> senderIp; <span class="type"><a href="../qtcore/qtglobal.html#quint16-typedef">quint16</a></span> senderPort; <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> datagram; datagram<span class="operator">.</span>resize(broadcastSocket<span class="operator">.</span>pendingDatagramSize()); <span class="keyword">if</span> (broadcastSocket<span class="operator">.</span>readDatagram(datagram<span class="operator">.</span>data()<span class="operator">,</span> datagram<span class="operator">.</span>size()<span class="operator">,</span> <span class="operator">&</span>senderIp<span class="operator">,</span> <span class="operator">&</span>senderPort) <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) <span class="keyword">continue</span>; <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">></span> list <span class="operator">=</span> datagram<span class="operator">.</span>split(<span class="char">'@'</span>); <span class="keyword">if</span> (list<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> <span class="number">2</span>) <span class="keyword">continue</span>; <span class="type">int</span> senderServerPort <span class="operator">=</span> list<span class="operator">.</span>at(<span class="number">1</span>)<span class="operator">.</span>toInt(); <span class="keyword">if</span> (isLocalHostAddress(senderIp) <span class="operator">&</span><span class="operator">&</span> senderServerPort <span class="operator">=</span><span class="operator">=</span> serverPort) <span class="keyword">continue</span>; <span class="keyword">if</span> (<span class="operator">!</span>client<span class="operator">-</span><span class="operator">></span>hasConnection(senderIp)) { Connection <span class="operator">*</span>connection <span class="operator">=</span> <span class="keyword">new</span> Connection(<span class="keyword">this</span>); <span class="keyword">emit</span> newConnection(connection); connection<span class="operator">-</span><span class="operator">></span>connectToHost(senderIp<span class="operator">,</span> senderServerPort); } } } <span class="type">void</span> PeerManager<span class="operator">::</span>updateAddresses() { broadcastAddresses<span class="operator">.</span>clear(); ipAddresses<span class="operator">.</span>clear(); foreach (<span class="type"><a href="qnetworkinterface.html">QNetworkInterface</a></span> interface<span class="operator">,</span> <span class="type"><a href="qnetworkinterface.html">QNetworkInterface</a></span><span class="operator">::</span>allInterfaces()) { foreach (<span class="type"><a href="qnetworkaddressentry.html">QNetworkAddressEntry</a></span> entry<span class="operator">,</span> interface<span class="operator">.</span>addressEntries()) { <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> broadcastAddress <span class="operator">=</span> entry<span class="operator">.</span>broadcast(); <span class="keyword">if</span> (broadcastAddress <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>Null <span class="operator">&</span><span class="operator">&</span> entry<span class="operator">.</span>ip() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost) { broadcastAddresses <span class="operator"><</span><span class="operator"><</span> broadcastAddress; ipAddresses <span class="operator"><</span><span class="operator"><</span> entry<span class="operator">.</span>ip(); } } } } </pre> </div> <!-- @@@network-chat/peermanager.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 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>