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Root » Houdini Indie and Apprentice » Cleaning up HDA callbacks

peteski

March 3, 2026 18:36:52

Hi all,

I'm using hou.hipFile.addEventCallback in a HDA to update some things when the scene is saved. I have an OnDelete function that cleans up the callbacks with hou.hipFile.clearEventCallbacks().

Will that remove all callbacks including ones from other HDAs?

It's super handy to be able to update my HDA on scene save but I'm just a little worried that cleanup will break other things using callbacks...

Thanks,
Pete

tamte

March 3, 2026 20:23:22

peteski
I'm using hou.hipFile.addEventCallback

Then to remove just specific callbacks you should use

hou.hipFile.removeEventCallback(callback)

You can also query all registered callback using

hou.hipFile.eventCallbacks()

peteski

March 3, 2026 21:18:40

Thanks!

I went with this -

def CleanUp(kwargs):
    callbacks = hou.hipFile.eventCallbacks()
    for x in range(len(callbacks)):
        if(callbacks[x] == addSceneEventCallback):
            hou.hipFile.removeEventCallback(callbacks[x])