The best thing to do is to track all of your callbacks with a registration
mechanism so you can access them after the fact. This is a general practice
that is good to get into because it is possible for a lot of confusion to
ensue otherwise.

Is the MSceneMessage a temporary callback based on a context you are
setting? If not, you might want to consider kicking off such a callback
when you are initializing your system at Maya startup. In other words, if
you want this thing running all the time, then start it up when Maya starts.

-Judah


On Wed, Apr 3, 2013 at 1:36 PM, Sune <[email protected]> wrote:

> I'm adding and removing callbacks with MSceneMessage from a python script.
> I'd like to somehow query if these callbacks exist already, before adding
> them. I searched for the answer, but came up blank.
>
> I guess I could define these in a python plugin, then I would only ever
> have one instance, but that seems like a workaround.
>
> Any help would be great!
>
> Sune
>
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