clean up procedure before quit game?

Scripting Issues
1

i read about python’s “atexit” module and tried to register my clean up function , so python would quit after running the clean up function.
(because except python and panda modules, i also use ctypes to import external DLLs, and i plan to write some functions to DLL which may require cleanup, such as memory heap)

for example:

def cleanup(): time.sleep(5.0)

atexit.register(cleanup)

it works, if i run the game in interactive mode - python sleeps 5 seconds before quiting.

but if i run the game with pythonw.exe , and quit the game by pressing alt+F4, pythonw doesn’t sleep, and it’s closed immediately.

if i write a cleanup function in python and activate it by a key event, it should work.
the problem is, if the user(usually me) close the app by pressing alt+F4, any cleanup procedure is skipped.

so, is there a way to intercept the key combination(alt+F4)?
i tried the accept() function of panda. it can’t do that.

btw: if a Panda app is activated by pythonw.exe, and it is closed by alt+F4, does Panda even clean up the graphic device? or is it safe to just close it? - though, i didn’t encounter a problem even if i rerun the app for many times a day.

2

I think you can try to use Panda’s window-event as described in this topic [Close window)

3

thanks, it works.

related codes are like this:

base.win.setCloseRequestEvent('myeventname')

accept('myeventname',mycleanupprocedure)

def mycleanupprocedure():
    function1()
    function2()
    quit()
4

You could also override destroy() or exitfunc() in your ShowBase subclass, as long as you don’t forget to upcall.