[python-win32] COM: Minimal example of a custom server working with DispatchWithEvents()

[William Belanger]

Hi,


There is no typelib file unfortunately. The interface needs to communicate
with Antidote's API by creating a COM server which exposes the methods
defined in the AdapteurAntidote class.


The problem is that the widget queried (a QTextEdit) is instantiated in
another class (MainWindow), and I cannot attribute a "parent" to the
dispatched COM object (self.server), as it raises either an AttributeError
or a TypeError, depending on its declaration in __public_attrs__.


>From the documentation, I thought I needed to use DispatchWithEvents to
handle the events in a separate "sink" class (ImplementationAntidote) that
would behave more like a generic python object. Is there any other way to
achieve this? It is quite a trivial feature so I assume it is possible to
do so?


Best,

Will

Le mer. 28 juil. 2021 à 04:25, Mark Hammond <skippy.hammond at gmail.com> a
écrit :

>
> On 28/07/2021 7:58 am, William Belanger wrote:
> > Hi everyone,
> >
> >
> > I'm trying to make a cross-platform Python interface for a third-party
> > API (Druide Antidote). The D-Bus part is done and working
> > (https://gitlab.com/-/snippets/2151173
> > <https://gitlab.com/-/snippets/2151173>), it consist of a server
> adapter
> > (AdaptateurAntidote), which relay the events to an handler class
> > (ImplementationAntidote).
> >
> >     Traceback (most recent call last):
> >
> >     File
> >
>  "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\site-packages\win32com\client\__init__.py",
> >     line 256, in DispatchWithEvents
> >
> >     ti = disp._oleobj_.GetTypeInfo()
> >
> >     pywintypes.com_error: (-2147352567, 'Exception occurred.', None,
> None)
>
> DispatchWithEvents creates a COM object, then gets the typeinfo needed
> to implement the interfaces defined for events - but this COM object is
> failing to provide that type info at runtime. It might still have a .tlb
> available though, and if it does, you can run `makepy.py` once and the
> snippet should work. The typelib can also live in a .dll, but I've never
> heard of Antidote so have no better suggestions.
>
> Cheers,
>
> Mark
>
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