Eric Frederich, 07.12.2012 16:42:
> From C, I'd like to call a Python function that takes an object and sets
> some attributes on it.
> Lets say this is the function...
>
> def foo(msg):
> msg.bar = 123
> msg.spam = 'eggs'
>
> How do I create an empty object in C?
> In Python I would do something like this...
>
> class Msg(object):
> pass
>
> ... and then instantiate an instance, and call the function.
>
> msg = Msg()
> foo(msg)
>
> I know how to create an empty dictionary and I get get by with that, but
> I'd like to create an object.
Here's some Cython code that you can call from C (after linking it in and
creating a Python interpreter at runtime):
cdef public set_attributes(msg, int bar, char* spam):
msg.bar = bar
msg.spam = spam.decode('utf8') # or whatever you use
However, how you'd use it depends on your actual C code. Personally, I'd
drop C and write all Python interaction in Cython. Makes these things way
easier.
Here are some longer examples:
https://github.com/cython/cython/tree/master/Demos/embed
https://github.com/cython/cython/tree/master/Demos/callback
Stefan
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