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From: Martin Krischik <martin@krischik.com>
Newsgroups: comp.lang.ada
Subject: Re: Thick Ada bindings to C Win32
Date: Fri, 26 Nov 2004 10:50:16 +0100
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Message-ID: <1810244.ahSE8CPTEK@linux1.krischik.com>
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Date: 2004-11-26T10:50:16+01:00
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Brian May wrote:

>>>>>> "Jeffrey" == Jeffrey Carter <spam@spam.com> writes:
> 
>     Jeffrey> Assuming that Lp[c?]void is a convention-C access type,
>     Jeffrey> you can safely convert between convention-C access types
>     Jeffrey> using Unchecked_Conversion. Your best bet may be to
>     Jeffrey> declare such an access type designating a Byte_Array
>     Jeffrey> (maybe you want Storage_Array here?), declare Item_Buffer
>     Jeffrey> aliased, store its 'Unchecked_Access in a variable of the
>     Jeffrey> appropriate type, and convert it to the Win32 access
>     Jeffrey> type.
> 
> The most obvious problem is as soon as I make Item_Buffer aliased, I
> need to make a complete copy of it.
> 
> Question:
> 
> Is S'Address the same as S(S'First)'Address?

Depends on the compiler used and if the array is definite or indefinite.
Remember: Indefinite Arrays need to store 'First and 'Last.

With GNAT I have succesfully converted definite arrays from C to Ada using
'Address.
 
With Regards

Martin
-- 
mailto://krischik@users.sourceforge.net
http://www.ada.krischik.com