Is it possible to get a callback before Blender closes?
There are bpy.app.handlers. Unfortunately there is no handler for closing Blender.
So is there a way to to know in a script when blender is about to close?
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1 Answer
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While we could support this via bpy.app.handlers, we decided not to add this since Python already supports exit callbacks, so you can use these (outside of Blender too - for any Python script).
See Python's atexit module.
Simple example use:
def goodbye(name, adjective):
print("Goodbye, %s, it was %s to meet you." % (name, adjective))
import atexit
atexit.register(goodbye, "Suzanne", "nice")
Note : To unregister the callback when disabling an add-on for instance, you can use :
atexit.unregister(callback)
answered Mar 10, 2016 at 9:08
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$\begingroup$ ok. This works. But I have a problem with it. When running the script from blender this function gets registered. But when putting it into an addon I get this error: Error: EXCEPTION_ACCESS_VIOLATION $\endgroup$– ndeeMar 10, 2016 at 10:21
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$\begingroup$ Try find which line causes the error, This will run when Blender is shutting down - so its possible you access data which is already freed. $\endgroup$ Mar 10, 2016 at 10:25
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2$\begingroup$ I know this post is very old, but I wanted to add information in case anyone finds this post because of the same problem. If you try to access your add-on's preferences during this event, you will get an access violation error. I was able to access several things from Blender, but not my own addon's preferences. In my opinion, Blender should notify add-ons of a shutdown BEFORE any data is released. $\endgroup$– RobertNov 11, 2019 at 12:18
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$\begingroup$ where do you use atexit.register? i tried placing it in the add-on def register but it doesn't seem to work $\endgroup$– mayoticJun 6, 2020 at 17:56