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From: "Aurele" <aurele.vitali@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Calling Ada from C
Date: 22 Feb 2007 12:40:09 -0800
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Date: 2007-02-22T12:40:09-08:00
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On Feb 22, 10:46 am, "hannibal.h...@gmail.com"
<hannibal.h...@gmail.com> wrote:
> I have a slight problem trying to call an Ada function from a C
> function. I need to pass in an unconstrained array to the Ada
> function. The problem is how I specify the size.
>
> This is probably very simple, but I am more or less just getting
> started with Ada, comming from a C-background.
>
> My code yealds warnings like this (when compiled with GNAT):
>
> foo.ads:50:23: warning: type of argument "Insert_C.Packet" is
> unconstrained array
> foo.ads:50:23: warning: foreign caller must pass bounds explicitly
>
> I have been searching a lot in order to figure out what to do about
> this, but all the FFI documentation is for calling C-functions from
> Ada, and some very simple examples of how to call ada functions that
> take primitive arguments (ints, and similar items).
>
> Anyone who know how to pass in the bounds explicitly?

Have you thought of passing it as an acces "pointer" to your array?