[python-win32] passing c structure into python function

[Tim Roberts]

a h wrote:
>
> thnks. i have used struct.unpack function for small c structure as the
> way Tim has suggested.
> i have an complex C structure, and passing this structure as a string
> and then using struct.unpack() is very tough job.and also i have
> pointers in my struct now.
>  
> i want that i have structure say like
> struct emp
> {
>     int id;
>     ...
> {
> and i just pass this into python function by converting c structure
> into python PyObject and using PyObject_CallObject() i can pass this
> pyobject.
>  
> In python script i want that i can simply print these values like
> def func(s):
>     print s.id <http://s.id>
>  
> Is it possible to do this way?.

Yes, it's possible to create an object in your C code, then add
attributes to it one by one to match your structure, but the code to do
so is rather tedious.  In my opinion -- and it is only my opinion! --
you're better off using a Python wrapper to create and populate the object.

Have you encountered the "swig" library?  Swig can read C header files,
and generate C and Python code that exposes the structures and function
calls to Python.  If you need to do this a lot, it might be worthwhile
to learn about it.  It is a difficult tool to learn, but once you get
it, it's incredibly handy.  Much of PyWin32 is automatically generated
by swig (with careful tweaking).

    http://www.swig.org/Doc1.3/Python.html

-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.