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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Thick Ada bindings to C Win32
References: <sa4y8haifwq.fsf@snoopy.apana.org.au>
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Date: Wed, 10 Nov 2004 04:36:36 GMT
Xref: g2news1.google.com comp.lang.ada:6101
Date: 2004-11-10T04:36:36+00:00
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> procedure Put(Handle : Handle_Type; Item : in Byte_Array) is
>
>    ...
>
>    Buffer : aliased Byte_Array := Item;
>
>    A : Interfaces.C.Strings.Char_Array_Access
>         := Convert_Byte_Array_Ptr_To_Char_Array_Ptr(Buffer'Unchecked_Access);
>
>    B : Interfaces.C.Strings.Chars_Ptr
>         := Interfaces.C.Strings.To_Chars_Ptr(A,False);
>
>    Buffer_Ptr : Win32.Lpcvoid
>         := Convert_Chars_Ptr_To_Lpcvoid(B);
>
> begin
>    Bool_Result :=
>       Win32.Winbase.WriteFile
>       ( ...
>        lpBuffer => Buffer_Ptr,                              -- Win32.Lpcvoid
>        nNumberOfBytesToWrite => Win32.Dword(Item'Length),   -- Win32.Dword  => 1 bytes
>        ... )
>
> end Put;
>
> While the get function is OK, I think the put function is horrible.

Did you try:

  function WriteFile(...
                     Item : in Byte_Array;
                     nNumberOfBytesToWrite : in Win32.DWord,
                      ...) return c_bool;
  pragma Import(StdCall, WriteFile, "WriteFile");

  procedure Put(Handle : Handle_Type; Item : in Byte_Array) is
     ...
  begin
     Bool_Result :=
        Win32.Winbase.WriteFile
        ( ...
         Item => Item,
         nNumberOfBytesToWrite => Win32.Dword(Item'Length),
         ... )

  end Put;