Re: Interface To C Struct That Includes An Array

[Roger <rogermcm2@gmail.com>]

On Tuesday, September 18, 2018 at 1:24:09 AM UTC+10, Lucretia wrote:
> On Monday, 17 September 2018 13:01:43 UTC+1, rog...@iinet.net.au  wrote:
> > I'm having problems interfacing the following record to C.
> > 
> >    type API_String is record
> >       Length  : Interfaces.C.size_t := 0;
> >       Data    : API_String_Data_Array := (others => Interfaces.C.char'Val (0));
> >    end record;
> >    pragma Convention (C_Pass_By_Copy, API_String);
> 
> Variable length things in Ada are problematic no matter what really.
> 
> What does the type definition of API_String_Data_Array look like? Is it also Convention => C?

I've replaced API_String_Data_Array with its original declaration which was
subtype API_String_Data_Array is char_array (0 .. Max_Length - 1):= (others => Interfaces.C.char'Val (0));


  --  This declaration has been checked OK for Key data. DON'T CHANGE
   type API_String is record
      Length  : Interfaces.C.size_t := 0;
      Data     : char_array (0 .. Max_Length - 1):= (others => Interfaces.C.char'Val (0));
   end record;
   pragma Convention (C_Pass_By_Copy, API_String);

but the same problem remains