Handling Com Events in Python (was Python and Windows Scripting Host)

[Alex Martelli]

"Syver Enstad" <syver.enstad at sensewave.com> wrote in message
news:8msq5k$tn6$1 at troll.powertech.no...
> > Hmm, yes, but that mixes up the object you're automating with the
> > one that's receiving/handling its events.  I find that somewhat
> > unpleasant/untrivial.
>
> I am not sure if I understand here, how is the object that is handling the
> events mixed up with the one we're automating?

win32com.client.DispatchWithEvents returns an object which is an
instance of a class which inherits both from the one of the object
we're automating, and from the one we supplied (as a parameter
to DispatchWithEvents) and which implements the response to
events.  Multiple inheritance of implementation is always slightly
complex, aka non-trivial, I think; here, in particular, we're mixing
two things which, while related, have conceptually distinct
identities.  Nothing too terrible, I guess (and I don't have a better
architecture to propose, really; I ended up implementing something
rather similar when I COM-enabled a proprietary scripting language
that we develop and distribute with our applications -- although
there are, I think, a few worthwhile enhancements which could be
taken from that architecture and applied to Python's win32com,
it's really minor issues).  But it's better to be aware of it.


Alex