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From: Tucker Taft <stt@averstar.com>
Subject: Re: Using C dll from Ada95
Date: 2000/01/11
Message-ID: <387BBFDB.C6D21A16@averstar.com>#1/1
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Organization: AverStar (formerly Intermetrics)  Burlington, MA  USA
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Date: 2000-01-11T00:00:00+00:00
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Philipp Boeni wrote:
> 
> Hello everybody!
> I want to use a C-dll (created with Visual Studio 6) in Ada95 (Aonix IDE
> 7.1.2). Ada-Target: Command-Line App (Win32). The DLL uses the following
> function exportation: #define DLLExport extern "C" __cdecl (dllexport) and
> is NOT using any MFC enhancements...
> So what exactly do I need from the dll to build the Ada-project? If I use
> the "myDll.lib"-file (added to the Ada link-path), I receive a Link
> 1006-error (error seeking file, could not reach address...) and if I do not
> use the lib-file, the linker complains about an undefined external symbol
> (the exported function name, that a want to call from Ada)...

This is unfortunately a potentially compiler-specific issue.
In general, you will need to specify the convention in the
pragma Import as something like "dll_cdecl" rather than simply "C".
E.g.:
    function In_Some_DLL(X : ...) return ...;
    pragma Import(Convention => dll_cdecl, Entity => In_Some_DLL,
      External_Name => "in_some_dll");

> 
> Thanks for any help....
> 
> Philipp Boeni, University of Applied Sciences Aargau, Switzerland

-- 
-Tucker Taft   stt@averstar.com   http://www.averstar.com/~stt/
Technical Director, Distributed IT Solutions  (www.averstar.com/tools)
AverStar (formerly Intermetrics, Inc.)   Burlington, MA  USA