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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of a Qt Solutions component.
+**
+** 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 Nokia Corporation 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."
+**
+****************************************************************************/
+
+
+#include "qtsinglecoreapplication.h"
+#include <QtCore/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"