Re: Binding to C

[chris <spamoff.danx@ntlworld.com>]

Patrice Freydiere wrote:

> so it can gives you some ideas for C binding from ADA.

Thanks.


> ps: when i started writing the simplejpeglib binding for ADA.
> i had a lot of interfacing problems du to the portability macros of the
> jpeglib. (it's surely possible, but when i've started my binding, my C
> interfacing Skills from ADA was poor).
> So i decided in my design to build a simple C interface to make Ada
> binding easier. This permit me to be "C structure independent" and provide a
> more easy upgrade of the jpeglib.

This is a problem... and I haven't found a *convienant* way to solve 
this (other than wrapping it up as you and Warren pointed out - thanks). 
  Macros change this, that and the other.  My ada code would need to be 
changed at the spec level on different platforms, compilers, etc... 
yuck.  A more experienced Ada developer could probably organise it 
better, but

All I really want to do now is *decode* and encode (at various 
qualities) a jpeg (in RBG).  Later things might get more complicated, 
but for now that's it.  I'm going to look at your lib again now I've got 
a bit more time.