hey,

with many structs and malloc'ated memory I need a possibility to free and clean up the memory before the engine closes.

Yes I know about sys_exit but what if the user shut down the engine via ESC key?
What is the best practice in that case?

on_esc, on_close
or just let the engine do the stuff (if you use sys_malloc)

I use a function attached to on_exit, which has only one frame to be executed. sys_exit runs the on_exit event just before really shutting down. it is called also when you get an error message and press cancel. in this case I found it useful to free dynamically allocated stuff. (normally engine really does the job)

as I know on_close is for handling application window X icon.

thank you both.

great! I thought on_exit is only called on sys_exit. Sorry Sivan I could not belive that on_exit got called even on engine crash.

So I gave on_exit the functionality to create a single file in the folder.....and yes a forced crash let the file occuring before the engine dies.

Works with ESC key too. Now I have the event for cleaning work
Thank you again.

I said error message, not a total crash to desktop!
"The on_exit function is executed just before the engine exits due to a sys_exit call, or A7.76 when the Cancel button was hit on an engine error message. It can be used to free DLLs or release user-allocated memory. "