main.cpp

/********************************************
**
** MIT License
**
** Copyright (c) 2017 JustCode Justyna Kulinska
**
** 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:
**
** 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 <QApplication>
#include <QMessageBox>
#include <QTimer>

#include "singleappmanager.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    /* tryRun method shall be used to check if another applications is already started
     * if try run retun false, it means that current application cannot run and should be closed */
    if (!SingleAppManager::tryRun())
        return 1;

    QObject::connect(&SingleAppManager::instance(), &SingleAppManager::anotherAppStarted,
                     []() {
        /* a anotherAppStarted signal is just an information that another instance was trying to start
         * it could be usefull for example to show your application window or do anything else you like */
        QMessageBox::information(nullptr, QApplication::applicationName(), QObject::tr("Another app trying to start!"));
    });

    QTimer::singleShot(60000, &a, &QApplication::quit); // this is to close app automatically
    QMessageBox::information(nullptr, QApplication::applicationName(), QObject::tr("First app started!"));

    a.setQuitOnLastWindowClosed(false);
    return a.exec();
}