[Caml-list] Interfacing C with Objective Caml

["matthieu.dubuget@libertysurf.fr" <matthieu.dubuget@libertysurf.fr>]

Hello Camlers,

I designed a simple OCaml module with a abstract type t and
functions
to create and manipulate values of that type.

type t
val create : int -> t
val use : t -> int
...

I now want to turn this module as a C dynamic link library under
Windows.

I do not know exactly how I should manage the ocaml values
created by
ocaml's 'create' function: passed to C (as pointer/handle),
and returned back
to ocaml when calling 'use' function.

I think I should register the values returned by 'create' in
order to
avoid them to be garbage collected between 'create' and
'use' calls,
but I don't know how to do this?

I should also provide a way to unregister those values?

I did not find (or understand ;-) how to achieve this using
a tool
(like CamlIDL or camouflage). It's why I'm trying to do it
by hand
first.

Thanks in advance

Matthieu Dubuget


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