Clean up before closing the QCoreApplication

Question

I have a console-based QCoreApplication which has timers and does socket communication and also uses locked mutex.

When I close the application manually

Answer 1

Turns out that closing command line application (checked on Win7 & VS2010) by pressing 'close' (red x button on title bar) passes the STATUS_CONTROL_C_EXIT signal to the application. All threads are aborted with this code.

The thread 'Main Thread' (0x980) has exited with code -1073741510 (0xc000013a).

The thread 'QThread' (0x2388) has exited with code -1073741510 (0xc000013a).

That means that there is no way to intercept this with the QCoreApplication::aboutToQuit() signal.

Take a look at winnt.h or ntstatus.h. That is the value assigned to the manifest constant STATUS_CONTROL_C_EXIT. The runtime is just choosing to end your program with the code to note the user's cancel operation.