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From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: How to implement I/O using Streams
Date: 1997/04/02
Message-ID: <dewar.859988299@merv>#1/1
X-Deja-AN: 230148797
References: <mheaney-ya023680000104972123200001@news.ni.net>
Organization: New York University
Newsgroups: comp.lang.ada
Date: 1997-04-02T00:00:00+00:00
List-Id: <comp.lang.ada>


Matthew said

<<The package Ada.Streams.Stream_IO is example of using a stream to do
(heterogeneous) file I/O.  I want to do network I/O - using BSD Sockets,
say - and use a streams interface to do it.

How do I do this?  The example in RM95 shows how a file object gives the
client a pointer to a stream (through which the I/O is performed), but is
silent about how the stream and file connect to each other.  How does the
stream know about the file?>>

The answer to your last question is that you write the Read and Write
procedures and they know what ever they need to know. This is simply
a straightforward programming problem with no magic. Remember that
Root_Stream_Type is an abstract type -- you have to supply all the
necessary code for a given instance.

If you want to look at examples of how this is done, look at the GLADE
code which precisely does what you are talking about (sends stream data
via sockets). In fact, while you are at it, check to see whether annex
E and GLADE might not solve your problem at a much higher level ...