<?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>server.cpp Example File | Qt Network 5.11</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 ><a href="../qtdoc/index.html">Qt 5.11</a></td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-fortuneserver-example.html">Fortune Server Example</a></td><td >server.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.11.2 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">server.cpp Example File</h1> <span class="subtitle">fortuneserver/server.cpp</span> <!-- $$$fortuneserver/server.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 <QtCore></span> <span class="preprocessor">#include "server.h"</span> Server<span class="operator">::</span>Server(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QDialog</span>(parent) <span class="operator">,</span> statusLabel(<span class="keyword">new</span> <span class="type">QLabel</span>) { setWindowFlags(windowFlags() <span class="operator">&</span> <span class="operator">~</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WindowContextHelpButtonHint); statusLabel<span class="operator">-</span><span class="operator">></span>setTextInteractionFlags(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>TextBrowserInteraction); <span class="type"><a href="qnetworkconfigurationmanager.html">QNetworkConfigurationManager</a></span> manager; <span class="keyword">if</span> (manager<span class="operator">.</span>capabilities() <span class="operator">&</span> <span class="type"><a href="qnetworkconfigurationmanager.html">QNetworkConfigurationManager</a></span><span class="operator">::</span>NetworkSessionRequired) { <span class="comment">// Get saved network configuration</span> <span class="type"><a href="../qtcore/qsettings.html">QSettings</a></span> settings(<span class="type"><a href="../qtcore/qsettings.html">QSettings</a></span><span class="operator">::</span>UserScope<span class="operator">,</span> QLatin1String(<span class="string">"QtProject"</span>)); settings<span class="operator">.</span>beginGroup(QLatin1String(<span class="string">"QtNetwork"</span>)); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> id <span class="operator">=</span> settings<span class="operator">.</span>value(QLatin1String(<span class="string">"DefaultNetworkConfiguration"</span>))<span class="operator">.</span>toString(); settings<span class="operator">.</span>endGroup(); <span class="comment">// If the saved network configuration is not currently discovered use the system default</span> <span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span> config <span class="operator">=</span> manager<span class="operator">.</span>configurationFromIdentifier(id); <span class="keyword">if</span> ((config<span class="operator">.</span>state() <span class="operator">&</span> <span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span><span class="operator">::</span>Discovered) <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span><span class="operator">::</span>Discovered) { config <span class="operator">=</span> manager<span class="operator">.</span>defaultConfiguration(); } networkSession <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qnetworksession.html">QNetworkSession</a></span>(config<span class="operator">,</span> <span class="keyword">this</span>); connect(networkSession<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qnetworksession.html">QNetworkSession</a></span><span class="operator">::</span>opened<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Server<span class="operator">::</span>sessionOpened); statusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Opening network session."</span>)); networkSession<span class="operator">-</span><span class="operator">></span>open(); } <span class="keyword">else</span> { sessionOpened(); } fortunes <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"You've been leading a dog's life. Stay off the furniture."</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"You've got to think about tomorrow."</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"You will be surprised by a loud noise."</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"You will feel hungry again in another hour."</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"You might have mail."</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"You cannot kill time without injuring eternity."</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Computers are not intelligent. They only think they are."</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>)); quitButton<span class="operator">-</span><span class="operator">></span>setAutoDefault(<span class="keyword">false</span>); connect(quitButton<span class="operator">,</span> <span class="operator">&</span><span class="type">QAbstractButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span><span class="type">QWidget</span><span class="operator">::</span>close); connect(tcpServer<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qtcpserver.html">QTcpServer</a></span><span class="operator">::</span>newConnection<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Server<span class="operator">::</span>sendFortune); <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="type">QVBoxLayout</span> <span class="operator">*</span>mainLayout <span class="operator">=</span> nullptr; <span class="keyword">if</span> (<span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>styleHints()<span class="operator">-</span><span class="operator">></span>showIsFullScreen() <span class="operator">|</span><span class="operator">|</span> <span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>styleHints()<span class="operator">-</span><span class="operator">></span>showIsMaximized()) { <span class="keyword">auto</span> outerVerticalLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>(<span class="keyword">this</span>); outerVerticalLayout<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> <span class="type">QSpacerItem</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Ignored<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>MinimumExpanding)); <span class="keyword">auto</span> outerHorizontalLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QHBoxLayout</span>; outerHorizontalLayout<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> <span class="type">QSpacerItem</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>MinimumExpanding<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Ignored)); <span class="keyword">auto</span> groupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGroupBox</span>(<span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>applicationDisplayName()); mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>(groupBox); outerHorizontalLayout<span class="operator">-</span><span class="operator">></span>addWidget(groupBox); outerHorizontalLayout<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> <span class="type">QSpacerItem</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>MinimumExpanding<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Ignored)); outerVerticalLayout<span class="operator">-</span><span class="operator">></span>addLayout(outerHorizontalLayout); outerVerticalLayout<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> <span class="type">QSpacerItem</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Ignored<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>MinimumExpanding)); } <span class="keyword">else</span> { mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>(<span class="keyword">this</span>); } mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(statusLabel); mainLayout<span class="operator">-</span><span class="operator">></span>addLayout(buttonLayout); setWindowTitle(<span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>applicationDisplayName()); } <span class="type">void</span> Server<span class="operator">::</span>sessionOpened() { <span class="comment">// Save the used configuration</span> <span class="keyword">if</span> (networkSession) { <span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span> config <span class="operator">=</span> networkSession<span class="operator">-</span><span class="operator">></span>configuration(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> id; <span class="keyword">if</span> (config<span class="operator">.</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span><span class="operator">::</span>UserChoice) id <span class="operator">=</span> networkSession<span class="operator">-</span><span class="operator">></span>sessionProperty(QLatin1String(<span class="string">"UserChoiceConfiguration"</span>))<span class="operator">.</span>toString(); <span class="keyword">else</span> id <span class="operator">=</span> config<span class="operator">.</span>identifier(); <span class="type"><a href="../qtcore/qsettings.html">QSettings</a></span> settings(<span class="type"><a href="../qtcore/qsettings.html">QSettings</a></span><span class="operator">::</span>UserScope<span class="operator">,</span> QLatin1String(<span class="string">"QtProject"</span>)); settings<span class="operator">.</span>beginGroup(QLatin1String(<span class="string">"QtNetwork"</span>)); settings<span class="operator">.</span>setValue(QLatin1String(<span class="string">"DefaultNetworkConfiguration"</span>)<span class="operator">,</span> id); settings<span class="operator">.</span>endGroup(); } tcpServer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtcpserver.html">QTcpServer</a></span>(<span class="keyword">this</span>); <span class="keyword">if</span> (<span class="operator">!</span>tcpServer<span class="operator">-</span><span class="operator">></span>listen()) { <span class="type">QMessageBox</span><span class="operator">::</span>critical(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Fortune Server"</span>)<span class="operator">,</span> tr(<span class="string">"Unable to start the server: %1."</span>) <span class="operator">.</span>arg(tcpServer<span class="operator">-</span><span class="operator">></span>errorString())); close(); <span class="keyword">return</span>; } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> ipAddress; <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">></span> ipAddressesList <span class="operator">=</span> <span class="type"><a href="qnetworkinterface.html">QNetworkInterface</a></span><span class="operator">::</span>allAddresses(); <span class="comment">// use the first non-localhost IPv4 address</span> <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> ipAddressesList<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="keyword">if</span> (ipAddressesList<span class="operator">.</span>at(i) <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost <span class="operator">&</span><span class="operator">&</span> ipAddressesList<span class="operator">.</span>at(i)<span class="operator">.</span>toIPv4Address()) { ipAddress <span class="operator">=</span> ipAddressesList<span class="operator">.</span>at(i)<span class="operator">.</span>toString(); <span class="keyword">break</span>; } } <span class="comment">// if we did not find one, use IPv4 localhost</span> <span class="keyword">if</span> (ipAddress<span class="operator">.</span>isEmpty()) ipAddress <span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span>(<span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost)<span class="operator">.</span>toString(); statusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"The server is running on\n\nIP: %1\nport: %2\n\n"</span> <span class="string">"Run the Fortune Client example now."</span>) <span class="operator">.</span>arg(ipAddress)<span class="operator">.</span>arg(tcpServer<span class="operator">-</span><span class="operator">></span>serverPort())); } <span class="type">void</span> Server<span class="operator">::</span>sendFortune() { <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> block; <span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> out(<span class="operator">&</span>block<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly); out<span class="operator">.</span>setVersion(<span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span><span class="operator">::</span>Qt_5_10); out <span class="operator"><</span><span class="operator"><</span> fortunes<span class="operator">[</span><span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">></span>bounded(fortunes<span class="operator">.</span>size())<span class="operator">]</span>; <span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span> <span class="operator">*</span>clientConnection <span class="operator">=</span> tcpServer<span class="operator">-</span><span class="operator">></span>nextPendingConnection(); connect(clientConnection<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>disconnected<span class="operator">,</span> clientConnection<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>deleteLater); clientConnection<span class="operator">-</span><span class="operator">></span>write(block); clientConnection<span class="operator">-</span><span class="operator">></span>disconnectFromHost(); } </pre> </div> <!-- @@@fortuneserver/server.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2018 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>