<?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>client.cpp Example File | Qt Core 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="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-ipc-localfortuneclient-example.html">Local Fortune Client Example</a></td><td >client.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtcore-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">client.cpp Example File</h1> <span class="subtitle">ipc/localfortuneclient/client.cpp</span> <!-- $$$ipc/localfortuneclient/client.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 <QtWidgets></span> <span class="preprocessor">#include <QtNetwork></span> <span class="preprocessor">#include "client.h"</span> Client<span class="operator">::</span>Client(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtwidgets/qdialog.html">QDialog</a></span>(parent)<span class="operator">,</span> hostLineEdit(<span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlineedit.html">QLineEdit</a></span>(<span class="string">"fortune"</span>))<span class="operator">,</span> getFortuneButton(<span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span>(tr(<span class="string">"Get Fortune"</span>)))<span class="operator">,</span> statusLabel(<span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span>(tr(<span class="string">"This examples requires that you run the "</span> <span class="string">"Local Fortune Server example as well."</span>)))<span class="operator">,</span> socket(<span class="keyword">new</span> <span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span>(<span class="keyword">this</span>)) { setWindowFlags(windowFlags() <span class="operator">&</span> <span class="operator">~</span><span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WindowContextHelpButtonHint); <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span> <span class="operator">*</span>hostLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span>(tr(<span class="string">"&Server name:"</span>)); hostLabel<span class="operator">-</span><span class="operator">></span>setBuddy(hostLineEdit); statusLabel<span class="operator">-</span><span class="operator">></span>setWordWrap(<span class="keyword">true</span>); getFortuneButton<span class="operator">-</span><span class="operator">></span>setDefault(<span class="keyword">true</span>); <span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span>(tr(<span class="string">"Quit"</span>)); <span class="type"><a href="../qtwidgets/qdialogbuttonbox.html">QDialogButtonBox</a></span> <span class="operator">*</span>buttonBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qdialogbuttonbox.html">QDialogButtonBox</a></span>; buttonBox<span class="operator">-</span><span class="operator">></span>addButton(getFortuneButton<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>ActionRole); buttonBox<span class="operator">-</span><span class="operator">></span>addButton(quitButton<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>RejectRole); in<span class="operator">.</span>setDevice(socket); in<span class="operator">.</span>setVersion(<span class="type"><a href="qdatastream.html">QDataStream</a></span><span class="operator">::</span>Qt_5_10); connect(hostLineEdit<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qlineedit.html">QLineEdit</a></span><span class="operator">::</span>textChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Client<span class="operator">::</span>enableGetFortuneButton); connect(getFortuneButton<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Client<span class="operator">::</span>requestNewFortune); connect(quitButton<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Client<span class="operator">::</span>close); connect(socket<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span><span class="operator">::</span>readyRead<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Client<span class="operator">::</span>readFortune); connect(socket<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span><span class="operator">::</span>LocalSocketError<span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span><span class="operator">::</span>error)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Client<span class="operator">::</span>displayError); <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span>(<span class="keyword">this</span>); mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(hostLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(hostLineEdit<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>); mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(statusLabel<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>); mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(buttonBox<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>); setWindowTitle(<span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>applicationDisplayName()); hostLineEdit<span class="operator">-</span><span class="operator">></span>setFocus(); } <span class="type">void</span> Client<span class="operator">::</span>requestNewFortune() { getFortuneButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>); blockSize <span class="operator">=</span> <span class="number">0</span>; socket<span class="operator">-</span><span class="operator">></span>abort(); socket<span class="operator">-</span><span class="operator">></span>connectToServer(hostLineEdit<span class="operator">-</span><span class="operator">></span>text()); } <span class="type">void</span> Client<span class="operator">::</span>readFortune() { <span class="keyword">if</span> (blockSize <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) { <span class="comment">// Relies on the fact that QDataStream serializes a quint32 into</span> <span class="comment">// sizeof(quint32) bytes</span> <span class="keyword">if</span> (socket<span class="operator">-</span><span class="operator">></span>bytesAvailable() <span class="operator"><</span> (<span class="type">int</span>)<span class="keyword">sizeof</span>(<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>)) <span class="keyword">return</span>; in <span class="operator">></span><span class="operator">></span> blockSize; } <span class="keyword">if</span> (socket<span class="operator">-</span><span class="operator">></span>bytesAvailable() <span class="operator"><</span> blockSize <span class="operator">|</span><span class="operator">|</span> in<span class="operator">.</span>atEnd()) <span class="keyword">return</span>; <span class="type"><a href="qstring.html">QString</a></span> nextFortune; in <span class="operator">></span><span class="operator">></span> nextFortune; <span class="keyword">if</span> (nextFortune <span class="operator">=</span><span class="operator">=</span> currentFortune) { <span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Client<span class="operator">::</span>requestNewFortune); <span class="keyword">return</span>; } currentFortune <span class="operator">=</span> nextFortune; statusLabel<span class="operator">-</span><span class="operator">></span>setText(currentFortune); getFortuneButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>); } <span class="type">void</span> Client<span class="operator">::</span>displayError(<span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span><span class="operator">::</span>LocalSocketError socketError) { <span class="keyword">switch</span> (socketError) { <span class="keyword">case</span> <span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span><span class="operator">::</span>ServerNotFoundError: <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Local Fortune Client"</span>)<span class="operator">,</span> tr(<span class="string">"The host was not found. Please make sure "</span> <span class="string">"that the server is running and that the "</span> <span class="string">"server name is correct."</span>)); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span><span class="operator">::</span>ConnectionRefusedError: <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Local Fortune Client"</span>)<span class="operator">,</span> tr(<span class="string">"The connection was refused by the peer. "</span> <span class="string">"Make sure the fortune server is running, "</span> <span class="string">"and check that the server name "</span> <span class="string">"is correct."</span>)); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtnetwork/qlocalsocket.html">QLocalSocket</a></span><span class="operator">::</span>PeerClosedError: <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Local Fortune Client"</span>)<span class="operator">,</span> tr(<span class="string">"The following error occurred: %1."</span>) <span class="operator">.</span>arg(socket<span class="operator">-</span><span class="operator">></span>errorString())); } getFortuneButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>); } <span class="type">void</span> Client<span class="operator">::</span>enableGetFortuneButton() { getFortuneButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="operator">!</span>hostLineEdit<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>isEmpty()); } </pre> </div> <!-- @@@ipc/localfortuneclient/client.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>