Re: Thick Ada bindings to C Win32

[Brian May <bam@snoopy.apana.org.au>]

>>>>> "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?

Maybe the best approach might be:

   function To_LPCVOID is new
      Ada.Unchecked_Conversion (System.Address, Win32.LPCVOID);

To_LPCVOID(Item'Address)

or 

To_LPCVOID(Item(Item'First)'Address)

Depending on the answer to my previous question.
-- 
Brian May <bam@snoopy.apana.org.au>