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119 lines
5.3 KiB
HTML
119 lines
5.3 KiB
HTML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<!-- console.qdoc -->
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<head>
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<title>A non-GUI example</title>
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<link href="classic.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr>
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<td align="left" valign="top" width="32"><img src="images/qt-logo.png" align="left" width="57" height="67" border="0" /></td>
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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a></td>
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</tr></table><h1 class="title">A non-GUI example<br /><span class="subtitle"></span>
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</h1>
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<p>This example shows how to use the single-application functionality in a console application. It does not require the <tt>QtGui</tt> library at all.</p>
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<p>The only differences from the GUI application usage demonstrated in the other examples are:</p>
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<p>1) The <tt>.pro</tt> file should include <tt>qtsinglecoreapplication.pri</tt> instead of <tt>qtsingleapplication.pri</tt></p>
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<p>2) The class name is <tt>QtSingleCoreApplication</tt> instead of <tt>QtSingleApplication</tt>.</p>
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<p>3) No calls are made regarding window activation, for obvious reasons.</p>
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<p>console.pro:</p>
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<pre> TEMPLATE = app
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CONFIG += console
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SOURCES += main.cpp
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include(../../src/qtsinglecoreapplication.pri)
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QT -= gui</pre>
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<p>main.cpp:</p>
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<pre><span class="comment"> /****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the Qt Solutions component.
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**
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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****************************************************************************/</span>
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#include "qtsinglecoreapplication.h"
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#include <QtCore/QDebug>
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void report(const QString& msg)
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{
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qDebug("[%i] %s", (int)QCoreApplication::applicationPid(), qPrintable(msg));
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}
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class MainClass : public QObject
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{
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Q_OBJECT
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public:
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MainClass()
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: QObject()
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{}
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public slots:
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void handleMessage(const QString& message)
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{
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report( "Message received: \"" + message + "\"");
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}
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};
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int main(int argc, char **argv)
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{
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report("Starting up");
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QtSingleCoreApplication app(argc, argv);
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if (app.isRunning()) {
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QString msg(QString("Hi master, I am %1.").arg(QCoreApplication::applicationPid()));
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bool sentok = app.sendMessage(msg, 2000);
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QString rep("Another instance is running, so I will exit.");
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rep += sentok ? " Message sent ok." : " Message sending failed; the other instance may be frozen.";
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report(rep);
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return 0;
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} else {
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report("No other instance is running; so I will.");
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MainClass mainObj;
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QObject::connect(&app, SIGNAL(messageReceived(const QString&)),
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&mainObj, SLOT(handleMessage(const QString&)));
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return app.exec();
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}
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}
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#include "main.moc"</pre>
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<p /><address><hr /><div align="center">
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<table width="100%" cellspacing="0" border="0"><tr class="address">
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<td width="30%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td>
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<td width="40%" align="center"><a href="http://qt.nokia.com/doc/trademarks.html">Trademarks</a></td>
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<td width="30%" align="right"><div align="right">Qt Solutions</div></td>
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</tr></table></div></address></body>
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</html>
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