Re: Translating a VB dll header to Ada

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On 11 Apr 2007 12:48:30 -0700, vienapl@hotmail.com wrote:

> I'm a really unexperienced programmer who trying to call a dll from
> Ada code. It compiles properly, but after some function calls I get
> the following error: raised PROGRAM_ERROR :
> EXCEPTION_ACCESS_VIOLATION.
> 
> The VB code is the following:

I am not an expert in VB, but for what it is worth

1. Microsoft changes VB permanently, you should really mention the version
number of the Beast. (:-))

2. The VBs I dealt with didn't used C convention. In your sources I see

   pragma Import (C, ...);

This means a C convention (cdecl in Windows terms), but it should be
stdcall instead:

   pragma Import (stdcall, ...); -- If you are using GNAT

3. Passing strings from/to VB is a mess. I don't remember the details,
sorry. Maybe others could comment on that.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de