<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- portingcppapps_toqt5.qdoc --> <title>Porting C++ Applications to Qt 5 | Qt 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 ><a href="index.html">Qt 5.9</a></td><td >Porting C++ Applications to Qt 5</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="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#related-topics">Related Topics</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">Porting C++ Applications to Qt 5</h1> <span class="subtitle"></span> <!-- $$$portingcppapp.html-description --> <div class="descr"> <a name="details"></a> <p>This topic talks about the Qt Widgets changes in Qt 5. The following step-by-step instructions take you through the changes required to port the Animated Tiles application to Qt 5:</p> <ol class="1" type="1"><li>Open the Animated Tiles project using Qt Creator.</li> <li>Edit <code>main.cpp</code> and replace the <code>#include <QtGui></code> instance with <code>#include <QtWidgets></code>. The Perl-script <code>fixqt4headers.pl</code> can be used to scan the source files of a project and perform the replacements.</li> <li>Edit the <code>animatedtiles.pro</code> and add <code>QT += widgets</code> towards the end of the file.<p><b>Note: </b>Qt GUI is included by default in all Qt applications unless excluded using the <code>QT -= gui</code> directive in the <code>qmake</code> project file.</p></li> <li>Save the changes and run the application.</li> </ol> <p>Once you see the application running, check whether it behaves as expected.</p> <p class="centerAlign"><img src="images/animatedtiles_snapshot.png" alt=""A snapshot of the \c animatedtiles application running on Ubuntu v12.04"" /></p><p>It is also possible to keep the project compiling with Qt 4 and Qt 5. This requires:</p> <ol class="1" type="1"><li>Omitting the module name from all includes by running the <code>fixqt4headers.pl</code> script with the <code>--strip-modules</code> option.</li> <li>Adding scopes depending on the version of Qt to the <code>.pro</code> files:<pre class="cpp"> greaterThan(QT_MAJOR_VERSION<span class="operator">,</span> <span class="number">4</span>): QT <span class="operator">+</span><span class="operator">=</span> widgets </pre> </li> <li>Introducing <code>#if</code> scopes around code using modified API:<pre class="cpp"> <span class="preprocessor">#if QT_VERSION >= 0x050000</span> headerView<span class="operator">-</span><span class="operator">></span>setSectionResizeMode(<span class="type">QHeaderView</span><span class="operator">::</span>ResizeToContents); <span class="preprocessor">#else</span> headerView<span class="operator">-</span><span class="operator">></span>setResizeMode(<span class="type">QHeaderView</span><span class="operator">::</span>ResizeToContents); <span class="preprocessor">#endif</span> </pre> </li> </ol> <p>if you are using Qt WebKit, see Qt WebKit to Qt WebEngine porting instructions.</p> <a name="related-topics"></a> <h2 id="related-topics">Related Topics</h2> <ul> <li><a href="sourcebreaks.html">C++ API Changes</a></li> <li><a href="portingqmlapp.html">Porting QML Applications to Qt 5 Example</a></li> <li><a href="qtexamplesandtutorials.html">Qt Examples And Tutorials</a></li> </ul> </div> <!-- @@@portingcppapp.html --> </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>