How to set a signal before shutdown?

[inger]

Hello!

I'm using qextserialport for sending data. In my program I have no GUI. The progam will automatic start in the background when the PC is started. I need to set RTS low before shutdown the program. The program will be shutdown when the power turn off. In my testprogram I push x-button in Application Output.

Is it possible to catch some shutdownsignal so I can call

CommPort->setRts(0);

CommPort->setRts(0);

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before the PC is shutdown. It is possible to use another connect for a shutdown signal?

My main program is like, I have deleted some code that I think are irrelevant:

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    createDatabaseConnection();
 
    // Initiate all modules
    FlexiBlinkRX flexiBlinkRx;
    FBtoFLTP FBtoFLTP1;
    FilterEngine filterEngine;
    smsThread SMSThread;
 
    SMSThread.start();
 
    // Connect all signals between modules
    FBtoFLTP1.connect       (&flexiBlinkRx, SIGNAL(incommingDataSignal()), SLOT(startTask()));
    filterEngine.connect    (&FBtoFLTP1, SIGNAL(inputToQueueSignal()), SLOT(checkqFilterQueue()));
 
    // Start executing
    a.exec();
 
    SMSThread.quit();
    SMSThread.wait();
 
    flexiBlinkRx.CommPort->setRts(0);
    return 0;
}

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

    // Initiate all modules
    FlexiBlinkRX flexiBlinkRx;
    FBtoFLTP FBtoFLTP1;
    FilterEngine filterEngine;
    smsThread SMSThread;
    
    SMSThread.start();

    // Connect all signals between modules
    FBtoFLTP1.connect       (&flexiBlinkRx, SIGNAL(incommingDataSignal()), SLOT(startTask()));
    filterEngine.connect    (&FBtoFLTP1, SIGNAL(inputToQueueSignal()), SLOT(checkqFilterQueue()));
    
    // Start executing
    a.exec();

    SMSThread.quit();
    SMSThread.wait();

    flexiBlinkRx.CommPort->setRts(0);
    return 0;
}

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