Krish wrote:

Hello People

I hope I am On Topic. Anyways, here is my problem. Any insights would

be really appreciated.

Posting to the nu**************@lists.sourceforge.net list would help

generate more responses, I think.

I have wrapped a C IO module using SWIG -> Python Module. Suppose the

name of the module is "imageio" and the reader function from the file

is image_read() which returns an object ( "filled" C structure) with a

lot of members.

Let

a = imageio.image_read("testfile.image")

Now a is the object which contains pointer to data of the image. ( void

* pdata). ( a also contains the datatype which I need to typecast to

get the data pointed by pdata). My question is how to access the data

pointed by pdata in *Python*.

Yes, you are right that you need to use typemaps. It's been awhile

since I did this kind of thing, but here are some pointers.

1) Look at Michael Sanner's typemaps at

http://www.scripps.edu/mb/olson/peop...mericTypemaps/
Except for the CHAR version, these should work for NumPy by replacing

Numeric/arrayobject.h with numpy/arrayobject.h

2) In full scipy there are typemaps for numpy arrays in

cluster/src/swig_num.i

Look here...

http://projects.scipy.org/scipy/scip...src/swig_num.i
This should help you get started with some examples. Typemaps can be a

little confusing at first, but they do make your interface a bit nicer.

-Travis