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From: mcc@entropy.cs.princeton.edu (Martin C. Carlisle)
Subject: Re: Linking Ada and DLLs
Date: 1999/03/12
Message-ID: <7cbotv$quv$1@cnn.Princeton.EDU>#1/1
X-Deja-AN: 454298619
References: <01be6cab$bc8e4380$40bd2bc0@pc-internet2>
Organization: US Air Force Academy, Dept of Computer Science
Newsgroups: comp.lang.ada
Date: 1999-03-12T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <01be6cab$bc8e4380$40bd2bc0@pc-internet2>,
J�r�me HAGUET <j.haguet@cadwin.com> wrote:
>I am trying to build an  application in ADA linked with C DLLs. 
>This DLLs use stdcall calling convention.
>
>I built import library using dll2def and dlltool :
>  dll2def imp_dll.dll > imp_dll.def
>  dlltool --dllname imp_dll.dll --def imp_dll.def --output imp_dll.a
>
>if I uses import (Stdcall, ada_name, "C_name"), link fails. If I uses 
>import (C, ada_name,
>"C_name"), link works but execution fails.
>
>Can someone explain me why I cannot use stdcall ? 

As I recall, the problem is that dll2def doesn't create the appropriate
file.  I had to manually edit it to add the @8, @12, etc. to the end of
each export name, then add the -k flag to dlltool.

To figure out what extension to add, you can do one of two things:
1) If you already have a .lib file, look in it to see what the names
are.
2) Count up the number of bytes of arguments being passed (usually 4
per argument, unless you have doubles).  3 ints => @12 is the suffix.

--Martin

-- 
Martin C. Carlisle, Asst Prof of Computer Science, US Air Force Academy
carlislem@acm.org, http://www.usafa.af.mil/dfcs/bios/carlisle.html
DISCLAIMER:  This content in no way reflects the opinions, standards or 
policy of the US Air Force Academy or the United States Government.