On Thu, 20 Jan 2022, 6:35 am Rudi Hammad, <[email protected]> wrote:
> hello,
>
> I though about sharing someting strange that occured to me. I had a method
> that contained
> MPlug.destinations() which as an art requieres an MPlugArray(). For some
> reason, probably because I was in a hurry and I didn't thought about it, I
> casted all the MPlugs from MPlug.destinations() into a python list. Let's
> call it foo=list().
> And that's where I started getting crashes. For instance, if I did
> something like
> foo[0], which is supposed to hold an MPlug, maya return the MPlug okey,
> but if I did foo[0].isNull() it returned True and then crashed.
>
> Whereas if you don't use a python list, and query directly the
> MPlugArray (e.g, myMPlugArr[0].isNull) it returns False and everything is
> ok.
>
> So my question more out curiosity than anything else. I know python lists
> are mutable objects, but not sure how or if that could be related.
>
> Cheers,
> R
>
If foo[0] gives you an object, but foo[0].isNull() crashes, then it could
be a bug in the C++ wrapper and how it reference counts. Does it crash if
you first save the object in a variable?
p = foo[0]
p.isNull()
I think either way it may be a bug in the wrappers around the C++ memory
and the reference counting.
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