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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: gnat sockets problem
Date: 30 May 2004 12:06:58 +0100
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mutilation@bonbon.net (wave) writes:

>     loop
>       declare
>          Message : String := String'Input (Channel);
>       begin
>          Put (Message);
>       end;
>    end loop;

Tom has given you a suggestion for the send part.

For the receive part, you need to read the whole datagram at one go,
so you mustn't use the stream attributes ('Read, 'Input even) on a
network socket stream (for a record type, each non-elementary
component of the stream ends up in a recvFrom() from the socket!).

The same is true in reverse for 'Write; avoid it for UDP!

Instead, use GNAT.Sockets.Receive_Socket (I've used the second form
when receiving UDP messages):

   procedure Receive_Socket
     (Socket : Socket_Type;
      Item   : out Ada.Streams.Stream_Element_Array;
      Last   : out Ada.Streams.Stream_Element_Offset;
      From   : out Sock_Addr_Type);

to read into a Stream_Element_Array of the appropriate maximum size
you are expecting; no harm really in choosing the max size of a UDP
datagram, 1500 bytes or so, unless Quake uses a smaller max size.

Once you have the Stream_Element_Array you can read the bounds etc
from it and use unchecked conversion (or overlay) to get at the actual
fields.

-- 
Simon Wright                               100% Ada, no bugs.