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From: Martin Krischik <martin@krischik.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT Ada.Streams Bug?
Date: Sat, 27 Nov 2004 08:34:39 +0100
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Date: 2004-11-27T08:34:39+01:00
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Warren W. Gay VE3WWG wrote:

> Georg Bauhaus wrote:
>> Warren W. Gay VE3WWG <ve3wwg@nospam.cogeco.ca> wrote:
>> : The point about efficiency is also a good one to raise. For
>> : example, if you String'Read(Stream,Var), GNAT calls the
>> : 'Read routine for each and every Character of the string.
>> : One pines for something more efficient than this, and I
>> : hope for the day when this improves in GNAT. (hint)
>> 
>> While not a stream of elements, perhaps Fast_Read in
>> the XML/Ada sources is of interest?
> 
> All kinds of possibilities are available when _you_ control
> the format. But when dealing with things like partition
> tables, and existing file formats, I find it disappointing
> that Ada95 struggles with this. I am happy to see that this
> problem is recognized, and will in some way be addressed in
> the Ada200Y standard.

True. When you do low level programming than you migh want to consider some
of Ada's low level features - and not a very high level IO package.

In your case: Read the data into an array of Short_Short_Integer and then
use either Unchecked_Convertion or for X'Address use Y'Address to convert
it to your structure.

You should consider one of the lower level IO package to read the data. Ada
has 4 IO packages and the most difficult part about them is to choose the
right one.

With Regards

Martin
-- 
mailto://krischik@users.sourceforge.net
http://www.ada.krischik.com