[python-win32] passing c structure into python function [SEC=PERSONAL]

[Andrew MacIntyre]

> On Behalf Of 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

Pyrex and Cython might also be useful alternatives for the OP's purpose.

-------------------------> "These thoughts are mine alone!" <---------
Andrew MacIntyre           Operations Branch
tel:   +61 2 6219 5356     Communications Infrastructure Division
fax:   +61 2 6253 3277     Australian Communications & Media Authority
email: andrew.macintyre at acma.gov.au            http://www.acma.gov.au/


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