/**************************************************************************** ** ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the Qt Solutions component. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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 Digia Plc and its Subsidiary(-ies) 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qtsinglecoreapplication.h" #include <QDebug> void report(const QString& msg) { qDebug("[%i] %s", (int)QCoreApplication::applicationPid(), qPrintable(msg)); } class MainClass : public QObject { Q_OBJECT public: MainClass() : QObject() {} public slots: void handleMessage(const QString& message) { report( "Message received: \"" + message + "\""); } }; int main(int argc, char **argv) { report("Starting up"); QtSingleCoreApplication app(argc, argv); if (app.isRunning()) { QString msg(QString("Hi master, I am %1.").arg(QCoreApplication::applicationPid())); bool sentok = app.sendMessage(msg, 2000); QString rep("Another instance is running, so I will exit."); rep += sentok ? " Message sent ok." : " Message sending failed; the other instance may be frozen."; report(rep); return 0; } else { report("No other instance is running; so I will."); MainClass mainObj; QObject::connect(&app, SIGNAL(messageReceived(const QString&)), &mainObj, SLOT(handleMessage(const QString&))); return app.exec(); } } #include "main.moc"