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| 7 | <title>A non-GUI example</title> |
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| 15 | </tr></table><h1 class="title">A non-GUI example<br /><span class="subtitle"></span> |
| 16 | </h1> |
| 17 | <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> |
| 18 | <p>The only differences from the GUI application usage demonstrated in the other examples are:</p> |
| 19 | <p>1) The <tt>.pro</tt> file should include <tt>qtsinglecoreapplication.pri</tt> instead of <tt>qtsingleapplication.pri</tt></p> |
| 20 | <p>2) The class name is <tt>QtSingleCoreApplication</tt> instead of <tt>QtSingleApplication</tt>.</p> |
| 21 | <p>3) No calls are made regarding window activation, for obvious reasons.</p> |
| 22 | <p>console.pro:</p> |
| 23 | <pre> TEMPLATE = app |
| 24 | CONFIG += console |
| 25 | SOURCES += main.cpp |
| 26 | include(../../src/qtsinglecoreapplication.pri) |
| 27 | QT -= gui</pre> |
| 28 | <p>main.cpp:</p> |
| 29 | <pre><span class="comment"> /**************************************************************************** |
| 30 | ** |
| 31 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
| 32 | ** All rights reserved. |
| 33 | ** |
| 34 | ** Contact: Nokia Corporation (qt-info@nokia.com) |
| 35 | ** |
| 36 | ** This file is part of a Qt Solutions component. |
| 37 | ** |
| 38 | ** You may use this file under the terms of the BSD license as follows: |
| 39 | ** |
| 40 | ** "Redistribution and use in source and binary forms, with or without |
| 41 | ** modification, are permitted provided that the following conditions are |
| 42 | ** met: |
| 43 | ** * Redistributions of source code must retain the above copyright |
| 44 | ** notice, this list of conditions and the following disclaimer. |
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| 67 | |
| 68 | #include "qtsinglecoreapplication.h" |
| 69 | #include <QtCore/QDebug> |
| 70 | |
| 71 | void report(const QString& msg) |
| 72 | { |
| 73 | qDebug("[%i] %s", (int)QCoreApplication::applicationPid(), qPrintable(msg)); |
| 74 | } |
| 75 | |
| 76 | class MainClass : public QObject |
| 77 | { |
| 78 | Q_OBJECT |
| 79 | public: |
| 80 | MainClass() |
| 81 | : QObject() |
| 82 | {} |
| 83 | |
| 84 | public slots: |
| 85 | void handleMessage(const QString& message) |
| 86 | { |
| 87 | report( "Message received: \"" + message + "\""); |
| 88 | } |
| 89 | }; |
| 90 | |
| 91 | int main(int argc, char **argv) |
| 92 | { |
| 93 | report("Starting up"); |
| 94 | |
| 95 | QtSingleCoreApplication app(argc, argv); |
| 96 | |
| 97 | if (app.isRunning()) { |
| 98 | QString msg(QString("Hi master, I am %1.").arg(QCoreApplication::applicationPid())); |
| 99 | bool sentok = app.sendMessage(msg, 2000); |
| 100 | QString rep("Another instance is running, so I will exit."); |
| 101 | rep += sentok ? " Message sent ok." : " Message sending failed; the other instance may be frozen."; |
| 102 | report(rep); |
| 103 | return 0; |
| 104 | } else { |
| 105 | report("No other instance is running; so I will."); |
| 106 | MainClass mainObj; |
| 107 | QObject::connect(&app, SIGNAL(messageReceived(const QString&)), |
| 108 | &mainObj, SLOT(handleMessage(const QString&))); |
| 109 | return app.exec(); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | #include "main.moc"</pre> |
| 114 | <p /><address><hr /><div align="center"> |
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| 116 | <td width="30%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td> |
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