From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,4e101bd1b1b0a66c
X-Google-Attributes: gid103376,public
From: dkristol@pollock.artists (David Kristola)
Subject: Re: Calling Ada proceedures from a C program
Date: 1999/06/10
Message-ID: <7jne6d$5p55@svlss.lmms.lmco.com>#1/1
X-Deja-AN: 487776334
Distribution: world
References: <7jlsqd$khj$1@nnrp1.deja.com>
Organization: heheh
Reply-To: dkristol@pollock.artists
Newsgroups: comp.lang.ada
Date: 1999-06-10T00:00:00+00:00
List-Id: <comp.lang.ada>

In article 1@nnrp1.deja.com, rekennedy@my-deja.com () writes:
>I'm having trouble getting the same thing to work for strings. For the
>strings, I ended up using the "char_ptr" type from Interfaces.C.Strings.
>On the c-side, the values are char *, on the Ada-side, they are
>char_ptr.  The C calls the Ada procedure without a problem, until the
>code starts to return to the C, passing the value back.  At that point,
>it raises an access violation.  Still not sure what I'll have to do to
>get this working. If anyone has done this, I'd really appreciate any
>advice on it.
>
>I'll list the specs, headers, etc of the files here as an example of
>one way of doing this. Hopefully it will keep someone else from having
>the same frustrations looking for examples.
>
>
>Robert Kennedy
>Science Applications International Corporation (SAIC)

You did not include the body for My_Test_Package, so i am not
sure what it is doing, but the problem may be in the way out
parameters are handled.  As with the integer case, Ada may
use a pointer to the string pointer.  I am sure this is in the
documentation somewhere, but i do not have it close at hand.


--djk, keeper of arcane lore & trivial fluff
Home: David95037 at aol dot com
Spam: goto.hades@welovespam.com