<?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>masterthread.cpp Example File | Qt Serial Port 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="qtserialport-index.html">Qt Serial Port</a></td><td ><a href="qtserialport-blockingmaster-example.html">Blocking Master Example</a></td><td >masterthread.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">masterthread.cpp Example File</h1> <span class="subtitle">blockingmaster/masterthread.cpp</span> <!-- $$$blockingmaster/masterthread.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2012 Denis Shienkov <denis.shienkov@gmail.com> ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtSerialPort module 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 "masterthread.h"</span> <span class="preprocessor">#include <QtSerialPort/QSerialPort></span> <span class="preprocessor">#include <QTime></span> QT_USE_NAMESPACE MasterThread<span class="operator">::</span>MasterThread(<span class="type">QObject</span> <span class="operator">*</span>parent) : <span class="type">QThread</span>(parent)<span class="operator">,</span> waitTimeout(<span class="number">0</span>)<span class="operator">,</span> quit(<span class="keyword">false</span>) { } MasterThread<span class="operator">::</span><span class="operator">~</span>MasterThread() { mutex<span class="operator">.</span>lock(); quit <span class="operator">=</span> <span class="keyword">true</span>; <span class="type">cond</span><span class="operator">.</span>wakeOne(); mutex<span class="operator">.</span>unlock(); wait(); } <span class="type">void</span> MasterThread<span class="operator">::</span>transaction(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>portName<span class="operator">,</span> <span class="type">int</span> waitTimeout<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>request) { <span class="type">QMutexLocker</span> locker(<span class="operator">&</span>mutex); <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>portName <span class="operator">=</span> portName; <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>waitTimeout <span class="operator">=</span> waitTimeout; <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>request <span class="operator">=</span> request; <span class="keyword">if</span> (<span class="operator">!</span>isRunning()) start(); <span class="keyword">else</span> <span class="type">cond</span><span class="operator">.</span>wakeOne(); } <span class="type">void</span> MasterThread<span class="operator">::</span>run() { bool currentPortNameChanged <span class="operator">=</span> <span class="keyword">false</span>; mutex<span class="operator">.</span>lock(); <span class="type">QString</span> currentPortName; <span class="keyword">if</span> (currentPortName <span class="operator">!</span><span class="operator">=</span> portName) { currentPortName <span class="operator">=</span> portName; currentPortNameChanged <span class="operator">=</span> <span class="keyword">true</span>; } <span class="type">int</span> currentWaitTimeout <span class="operator">=</span> waitTimeout; <span class="type">QString</span> currentRequest <span class="operator">=</span> request; mutex<span class="operator">.</span>unlock(); <span class="type"><a href="qserialport.html">QSerialPort</a></span> serial; <span class="keyword">if</span> (currentPortName<span class="operator">.</span>isEmpty()) { <span class="keyword">emit</span> error(tr(<span class="string">"No port name specified"</span>)); <span class="keyword">return</span>; } <span class="keyword">while</span> (<span class="operator">!</span>quit) { <span class="keyword">if</span> (currentPortNameChanged) { serial<span class="operator">.</span>close(); serial<span class="operator">.</span>setPortName(currentPortName); <span class="keyword">if</span> (<span class="operator">!</span>serial<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadWrite)) { <span class="keyword">emit</span> error(tr(<span class="string">"Can't open %1, error code %2"</span>) <span class="operator">.</span>arg(portName)<span class="operator">.</span>arg(serial<span class="operator">.</span>error())); <span class="keyword">return</span>; } } <span class="comment">// write request</span> <span class="type">QByteArray</span> requestData <span class="operator">=</span> currentRequest<span class="operator">.</span>toLocal8Bit(); serial<span class="operator">.</span>write(requestData); <span class="keyword">if</span> (serial<span class="operator">.</span>waitForBytesWritten(waitTimeout)) { <span class="comment">// read response</span> <span class="keyword">if</span> (serial<span class="operator">.</span>waitForReadyRead(currentWaitTimeout)) { <span class="type">QByteArray</span> responseData <span class="operator">=</span> serial<span class="operator">.</span>readAll(); <span class="keyword">while</span> (serial<span class="operator">.</span>waitForReadyRead(<span class="number">10</span>)) responseData <span class="operator">+</span><span class="operator">=</span> serial<span class="operator">.</span>readAll(); <span class="type">QString</span> response(responseData); <span class="keyword">emit</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>response(response); } <span class="keyword">else</span> { <span class="keyword">emit</span> timeout(tr(<span class="string">"Wait read response timeout %1"</span>) <span class="operator">.</span>arg(<span class="type">QTime</span><span class="operator">::</span>currentTime()<span class="operator">.</span>toString())); } } <span class="keyword">else</span> { <span class="keyword">emit</span> timeout(tr(<span class="string">"Wait write request timeout %1"</span>) <span class="operator">.</span>arg(<span class="type">QTime</span><span class="operator">::</span>currentTime()<span class="operator">.</span>toString())); } mutex<span class="operator">.</span>lock(); <span class="type">cond</span><span class="operator">.</span>wait(<span class="operator">&</span>mutex); <span class="keyword">if</span> (currentPortName <span class="operator">!</span><span class="operator">=</span> portName) { currentPortName <span class="operator">=</span> portName; currentPortNameChanged <span class="operator">=</span> <span class="keyword">true</span>; } <span class="keyword">else</span> { currentPortNameChanged <span class="operator">=</span> <span class="keyword">false</span>; } currentWaitTimeout <span class="operator">=</span> waitTimeout; currentRequest <span class="operator">=</span> request; mutex<span class="operator">.</span>unlock(); } } </pre> </div> <!-- @@@blockingmaster/masterthread.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>