53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
// Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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// SPDX-License-Identifier: BSD-3-Clause
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#include "qtsinglecoreapplication.h"
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#include <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"
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