Re: [Q] ctypes callbacks with Delphi
achrist_at_easystreet.com
Date: 10/19/03
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Date: Sat, 18 Oct 2003 22:24:19 -0700
Andrew MacIntyre wrote:
>
> On Fri, 17 Oct 2003 achrist@easystreet.com wrote:
>
> > I'm aving some trouble getting callbacks from a Delphi DLL back to
> > python working through ctypes.
>
> I suggest that this question will be more visible on the ctypes mailing
> list. I vaguely recall a question along these lines some time ago, so
> viewing the list archives might be useful.
>
I've been over those ASPN list archives as best I can, and I don't
see anything that solves this problem. However, trying to
search the lists is a little tricky. I did a search on 'callback'
and it shows me results 1-20, which don't show me anything that
I think will help, and clicking on '21-40' gives me advertising and
no more messages. IDK.
When I search for 'Delphi', nothing comes up. This can't be a Delphi
problem, can it? Delphi can't be that broken, can it?
When I search for the terms in the error message that I get, 'Access
Violation' and 'write address', I don't see a solution obviously
anywhere. The ASPN pages load very slowly on my machine over dial-up,
so it's no fun hunting around for something that you don't know is
there.
I see that I have to subscribe to the list to post a message. So, I
try to subscribe and go to the ASPN page to subscribe, and they list
about 40 groups, but no ctypes-users. Looks like subscriptions
to this one are not currently available to such as me.
The ctypes tutorial makes this look very easy, and I think that I'm
doing what it shows, and it almost works, but not 100%. IDK.
The unit tests that come with ctypes have a test for callbacks from
a DLL, so I try to look at that to see what goes on in the DLL to
see if I can write my DLL the same way. But they don't include source
for the DLL. They don't even call a real DLL. They test ctypes with
a synthetic DLL of some kind created by a ctypes CDLL macro. So the
unit test only shows that ctypes can talk to itself, not maybe a real
DLL. IDK.
If anyone is using ctypes with called-back functions written in python
returning (simple integer) values back to a DLL written in C or Delphi,
such DLL called from python through ctypes, I'd sure like to see
what the python and C or Delphi code that work together look like --
how the identity of the called-back function is passed to the DLL and
how the called-back function sends back its return value. I'm
trying to follow the tutorial, which looks very easy, but I've not got
it right.
TIA and thanks for your help,
Al
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