[Interest] Triggering Actions on Application Close

[franki]

Dnia wtorek, 9 lipca 2013 o 00:33:44 Mitchell Verter napisał(a):
> How do I trigger cleanup actions on application close?
> 
> I need to write out temporary objects and a footer to a file whenever
> the Application is closed.
> 
> I've tried several approaches, but none of them produces any result
> when I "Force Quit" by hitting the red button within QtCreator.
> 
> More specifically, I have tried to connect:
> 
>     QObject::connect(&myApplication, SIGNAL(aboutToQuit()),
> &myMainWindow,  SLOT(closeFileSlot()));
> 
> (note that I am using a QApplication rather than a QCoreApplication --
> I'm not sure if it makes a difference)
> 
> and also
> 
> connect(&myMainWindow, SIGNAL(destroy()), &myMainWindow,
> SLOT(closeFileSlot()));
> 
> Neither of these approaches seems to successfully trigger the
> closeFileSlot() Any suggestions about what the right technique might be?

Hi 

If you are doing this on Linux, I've made it like this:

in header:

#include <signal.h>
.......
public slots:
     void terminate(bool fromSignal);
.....
};
extern "C" void terminate_wrapper(int dummy);

in cpp file:
in main class constructor:

GlobalVariable= (void*)this;
signal(SIGTERM,terminate_wrapper);
........


void MainClass::terminate(bool fromSignal) {
    qDebug()<<"MainClass::terminate";
    ... close my services....
    qApp->quit();
}

void terminate_wrapper(int dummy) {
    MainClass *myApp=(MainClass*)GlobalVariable;
    myApp->terminate(true);
}

So every time I hit red button in QtCreator it sends SIGTERM to application, 
my wrapper catches it and I can do clean up.

regards
Marek


> 
> Thanks
> Mitchell
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