<?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>chat.cpp Example File | Qt D-Bus</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="qtdbus-index.html">Qt D-Bus</a></td><td ><a href="qtdbus-chat-example.html">D-Bus Chat Example</a></td><td >chat.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtdbus-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">chat.cpp Example File</h1> <span class="subtitle">chat/chat.cpp</span> <!-- $$$chat/chat.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 <QApplication></span> <span class="preprocessor">#include <QMessageBox></span> <span class="preprocessor">#include "chat.h"</span> <span class="preprocessor">#include "chat_adaptor.h"</span> <span class="preprocessor">#include "chat_interface.h"</span> ChatMainWindow<span class="operator">::</span>ChatMainWindow() : m_nickname(QLatin1String(<span class="string">"nickname"</span>)) { setupUi(<span class="keyword">this</span>); sendButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>); connect(messageLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(textChangedSlot(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))); connect(sendButton<span class="operator">,</span> SIGNAL(clicked(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(sendClickedSlot())); connect(actionChangeNickname<span class="operator">,</span> SIGNAL(triggered(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(changeNickname())); connect(actionAboutQt<span class="operator">,</span> SIGNAL(triggered(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(aboutQt())); connect(qApp<span class="operator">,</span> SIGNAL(lastWindowClosed())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(exiting())); <span class="comment">// add our D-Bus interface and connect to D-Bus</span> <span class="keyword">new</span> ChatAdaptor(<span class="keyword">this</span>); <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>registerObject(<span class="string">"/"</span><span class="operator">,</span> <span class="keyword">this</span>); org<span class="operator">::</span>example<span class="operator">::</span>chat <span class="operator">*</span>iface; iface <span class="operator">=</span> <span class="keyword">new</span> org<span class="operator">::</span>example<span class="operator">::</span>chat(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">,</span> <span class="keyword">this</span>); <span class="comment">//connect(iface, SIGNAL(message(QString,QString)), this, SLOT(messageSlot(QString,QString)));</span> <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>connect(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="string">"org.example.chat"</span><span class="operator">,</span> <span class="string">"message"</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(messageSlot(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>))); connect(iface<span class="operator">,</span> SIGNAL(action(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(actionSlot(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>))); NicknameDialog dialog; dialog<span class="operator">.</span>cancelButton<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">false</span>); dialog<span class="operator">.</span>exec(); m_nickname <span class="operator">=</span> dialog<span class="operator">.</span>nickname<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>trimmed(); <span class="keyword">emit</span> action(m_nickname<span class="operator">,</span> QLatin1String(<span class="string">"joins the chat"</span>)); } ChatMainWindow<span class="operator">::</span><span class="operator">~</span>ChatMainWindow() { } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>rebuildHistory() { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> history <span class="operator">=</span> m_messages<span class="operator">.</span>join( QLatin1String(<span class="string">"\n"</span> ) ); chatHistory<span class="operator">-</span><span class="operator">></span>setPlainText(history); } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>messageSlot(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>nickname<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>text) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> msg( QLatin1String(<span class="string">"<%1> %2"</span>) ); msg <span class="operator">=</span> msg<span class="operator">.</span>arg(nickname<span class="operator">,</span> text); m_messages<span class="operator">.</span>append(msg); <span class="keyword">if</span> (m_messages<span class="operator">.</span>count() <span class="operator">></span> <span class="number">100</span>) m_messages<span class="operator">.</span>removeFirst(); rebuildHistory(); } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>actionSlot(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>nickname<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>text) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> msg( QLatin1String(<span class="string">"* %1 %2"</span>) ); msg <span class="operator">=</span> msg<span class="operator">.</span>arg(nickname<span class="operator">,</span> text); m_messages<span class="operator">.</span>append(msg); <span class="keyword">if</span> (m_messages<span class="operator">.</span>count() <span class="operator">></span> <span class="number">100</span>) m_messages<span class="operator">.</span>removeFirst(); rebuildHistory(); } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>textChangedSlot(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>newText) { sendButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="operator">!</span>newText<span class="operator">.</span>isEmpty()); } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>sendClickedSlot() { <span class="comment">//emit message(m_nickname, messageLineEdit->text());</span> <span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span> msg <span class="operator">=</span> <span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span><span class="operator">::</span>createSignal(<span class="string">"/"</span><span class="operator">,</span> <span class="string">"org.example.chat"</span><span class="operator">,</span> <span class="string">"message"</span>); msg <span class="operator"><</span><span class="operator"><</span> m_nickname <span class="operator"><</span><span class="operator"><</span> messageLineEdit<span class="operator">-</span><span class="operator">></span>text(); <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>send(msg); messageLineEdit<span class="operator">-</span><span class="operator">></span>setText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>()); } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>changeNickname() { NicknameDialog dialog(<span class="keyword">this</span>); <span class="keyword">if</span> (dialog<span class="operator">.</span>exec() <span class="operator">=</span><span class="operator">=</span> <span class="type">QDialog</span><span class="operator">::</span>Accepted) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> old <span class="operator">=</span> m_nickname; m_nickname <span class="operator">=</span> dialog<span class="operator">.</span>nickname<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>trimmed(); <span class="keyword">emit</span> action(old<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"is now known as %1"</span>)<span class="operator">.</span>arg(m_nickname)); } } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>aboutQt() { <span class="type">QMessageBox</span><span class="operator">::</span>aboutQt(<span class="keyword">this</span>); } <span class="type">void</span> ChatMainWindow<span class="operator">::</span>exiting() { <span class="keyword">emit</span> action(m_nickname<span class="operator">,</span> QLatin1String(<span class="string">"leaves the chat"</span>)); } NicknameDialog<span class="operator">::</span>NicknameDialog(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QDialog</span>(parent) { setupUi(<span class="keyword">this</span>); } <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv) { <span class="type">QApplication</span> app(argc<span class="operator">,</span> argv); <span class="keyword">if</span> (<span class="operator">!</span><span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>isConnected()) { <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>(<span class="string">"Cannot connect to the D-Bus session bus.\n"</span> <span class="string">"Please check your system settings and try again.\n"</span>); <span class="keyword">return</span> <span class="number">1</span>; } ChatMainWindow chat; chat<span class="operator">.</span>show(); <span class="keyword">return</span> app<span class="operator">.</span>exec(); } </pre> </div> <!-- @@@chat/chat.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>