Using C struct in Python** corrected

[Fredrik Lundh]

Sudheer Gupta wrote:

> I am having trouble using C struct in python. Hope anyone can help me 
> out ...
> 
> Say, I have my C struct as
> 
> typedef struct call
> {
>       struct call *next;
>       // .....
> 
> } call_t;
> 
> I have a global variable, namely call_pool, which is of type call_t *
> 
> My python program:
> 
> cp = call_pool  # no error doing this, means that call_pool is accessable

Without any glue code?  That's weird.  What Python implementation is this?

> while cp:
>       print cp
>       cp = cp.next
> 
> This is giving me error: " There is no member or method name c_next"

Doesn't look like a Python exception to me.  Cannot find any trace of 
that message in the CPython sources either...

> Now, If I just do:
> 
> print cp
> print cp.next
> 
> there is no problem. But I am seeing a difference in the way python is 
> looking at the struct:
> 
> print cp       ->  (call_t*) 0xb0...
> print cp.next ->  (struct call *) 0xb0...
> 
> Is python not intelligent enough to diagnose the next pointer ??

I've written more C extensions for Python than most people, but I'm 
definitely not intelligent enough to decipher your post.  What on earth 
are you talking about ?  Are you sure you're posting to the right 
newsgroup ?

</F>