From: Florent Monnier <monnier.florent@gmail.com>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] How to pass C pointers to Caml
Date: Mon, 1 Mar 2010 07:22:15 +0100 [thread overview]
Message-ID: <201003010722.15601.monnier.florent@gmail.com> (raw)
In-Reply-To: <9dfe358d1002281955k4cb9207bi4afe5d649fc20e05@mail.gmail.com>
Le lundi 1 mars 2010 04:55:00, Jianzhou Zhao a écrit :
> I have been calling OCaml code from C in my project.
> The C code has some pointers to C structures.
> I got 'seg fault' when calling the OCaml function receiving
> C structure pointers.
>
> 18.7 at http://caml.inria.fr/pub/docs/manual-ocaml/manual032.html
> gives the examples that pass int into OCaml. These examples work for me.
> But, Does OCaml support to pass C structure pointers to OCaml?
Yes it does. Just cast your pointer to the type value.
In this tutorial there is an example "Pointers to C structures":
http://www.linux-nantes.org/~fmonnier/OCaml/ocaml-wrapping-c.php#ref_ptr
the pointer to a C struct is wrapped on the ocaml side by an abstract type
called "t" here, and it is provided back to C with print_t / dump_ptr.
next prev parent reply other threads:[~2010-03-01 6:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-01 3:55 Jianzhou Zhao
2010-03-01 6:22 ` Florent Monnier [this message]
2010-03-01 13:23 ` [Caml-list] " Jianzhou Zhao
2010-03-01 13:24 ` Goswin von Brederlow
2010-03-01 23:04 ` Florent Monnier
2010-03-02 10:19 ` Goswin von Brederlow
2010-03-02 11:34 ` Florent Monnier
2010-03-03 11:02 ` Goswin von Brederlow
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