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Cleaning up HDA callbacks

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peteski
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544 posts
Joined: Dec. 2013
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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
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tamte
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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()
Edited by tamte - March 3, 2026 20:24:10
Tomas Slancik
CG Supervisor
Framestore, NY
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peteski
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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])
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