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From: "Theodore E. Dennison" <dennison@escmail.mmc.orl.com>
Newsgroups: comp.lang.ada
Subject: Re: Problem with SMG!!!!
Date: 28 Feb 1995 18:21:35 GMT
Organization: IPL InterNetNews site
Message-ID: <3ivpjf$eco@theopolis.orl.mmc.com>
References: <1995Feb15.190318.1@clstcs> <3hvj11$pk6@theopolis.orl.mmc.com>
 <D4ooy1.EL2@irvine.com>
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Date: 1995-02-28T18:21:35+00:00
List-Id: <comp.lang.ada>

adam@irvine.com (Adam Beneschan) wrote:
> "Theodore E. Dennison" <dennison@escmail.mmc.orl.com> writes:
> > Unless I'm missing something, when you do screen I/O's with SMG, you
> > need to do ALL your screen I/Os with SMG. In other words, you need to
> > use the SMG output routines. Forget about Text_IO.
> > 
> Hmmm . . . I've been using SMG$ routines for keyboard input and the
> regular SYS$QIOW routines for output, and I've never had a problem.
> In other words, there seems to be nothing in VMS that requires that
> you use SMG$ for output if you're using it for input.
> 
> VAX Ada may be a different story, however.  If TEXT_IO.PUT routines

If I remember correctly, TEXT_IO operations are mapped directly to
RMS$ routines, not to SYS$QIO routines. I also remember that mixing
Text_IO.Put* routines with SMG$ tended to cause problems. SMG$ 
provides its own text input and output routines, so why not use them?
If you "mix-and-match" your I/O routines, you are asking for trouble.

To put this in OO terms: Text_IO is an abstraction for user I/O. SMG 
is a different abstraction for user I/O. Pick one abstraction, and 
stick with it.

T.E.D.