[Pythonmac-SIG] Catching exceptions with Python from a Shared Library

[Jack Jansen]

Chris,
I've cc'd the SIG again, because I'd like these answers to be kept in
the archive. Hope you don't mind...

Recently, "Christian Reyes" <christian@rocketnetwork.com> said:
> You understand the situation completely.  I was hoping that there was a way
> that python would catch the exception thrown from the DLL, but I now
> understand that it is the dynamic module that must catch it.
> 
> But how can I send it back to Python as a python exception from the dynamic
> module?  Is that possible?

You catch the C++ exception in the C++ way, and then you raise a
Python exception by calling one of the exception functions from
pyerrors.h and returning NULL from your function.

As I haven't done this before myself and may need to do so shortly
you'd do me a great favor if you could post a code snippet once you
have something working.

Oh yes: note that, even if MacPython could catch C++ exceptions, you
would really have to catch it in your module. You've probably
allocated objects and such that you need to free, and maybe other
cleanup to do.
--
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