main.cpp

// Copyright (c) Itay Grudev 2015 - 2023
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// Permission is not granted to use this software or any of the associated files
// as sample data for the purposes of building machine learning models.
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include <singleapplication.h>
#include "messagereceiver.h"

int main(int argc, char *argv[])
{
    QCoreApplication app( argc, argv );

    // Separate single instance object (that allows secondary instances)
    SingleApplication single_instance_guard( argc, argv, true );

    MessageReceiver msgReceiver;

    // If this is a secondary instance
    if( single_instance_guard.isSecondary() ) {
        single_instance_guard.sendMessage( app.arguments().join(' ').toUtf8() );
        qDebug() << "App already running.";
        qDebug() << "Primary instance PID: " << single_instance_guard.primaryPid();
        qDebug() << "Primary instance user: " << single_instance_guard.primaryUser();
        return 0;
    } else {
        QObject::connect(
            &single_instance_guard,
            &SingleApplication::receivedMessage,
            &msgReceiver,
            &MessageReceiver::receivedMessage
        );
    }

    return app.exec();
}