Closing Qt console application terminates process inside exec() call and doesn't reach to scope out from main()

Question

it is the problem I have in my Qt console application:

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

    MyApp app;
    app.start();

    return a.exec();
} // <== MyApp destructor must be called to free up resourcs but not reach here

Qt version: 5.4.1

Platform: Windows 10

Already I have faced with this problem in Window 7 and not fixing this.

Problem is exec call terminates process using exit system call in Windows after exiting main event loop and doesn't return.

another soultions such as using aboutToQuit signal of QCoreApplication class not working.

Answer 1

Straight from Qt documentation :

We recommend that you connect clean-up code to the aboutToQuit() signal, instead of putting it in your application's main() function because on some platforms the exec() call may not return. For example, on Windows when the user logs off, the system terminates the process after Qt closes all top-level windows. Hence, there is no guarantee that the application will have time to exit its event loop and execute code at the end of the main() function after the exec() call .

You say you tried aboutToQuit() with no luck but you should definitely focus on making that work. Would you please update the pasted code to include the aboutToQuit attempt so that we can help you?