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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: What is the best method for transmitting objects/tagged records?
Date: Tue, 7 Jun 2011 18:06:21 +0000 (UTC)
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Date: 2011-06-07T18:06:21+00:00
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>> marshalling/unmarshalling part of a Partition Communication Subsystem?
>
>I think that's what it amounts to, yes.

  Sending an object over a comm link differs from writing to/reading from
disk only in timing.  In CLAW, the different kinds of bitmaps (8 bit pixel,
24 bit, etc) are children of a root type.  The Write routine for each
child writes a standard .bmp file.  The Read routine is

  function Read (Filename : in String)
    return Claw.Bitmaps.Root_DIBitmap_Type'class;

It reads the header of the bmp file then does
        if Header.Private_Info.Color_Depth = Claw.Bitmaps.VGA and
           Header.Private_Info.Compression = Claw.Bitmaps.BI_RGB then
            declare
                Result : Claw.Bitmaps.VGA_DIBitmap_Type( height, width);
            ... read data into VGA_DIBitmap_Type data structure
                return Root_DIBitmap_Type'class(Result);
            end;
        elsif Header.Private_Info.Color_Depth = Claw.Bitmaps.EGA ...