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Article View: comp.sys.amiga.tech
Article #4219

Re: Env vars under 2.0

#4219
From: Kim DeVaughn
Date: Thu, 05 Jul 1990 08:59
48 lines
2727 bytes
In article <13000@cbmvax.commodore.com>, peter@cbmvax.commodore.com (Peter Cherna) writes:
> In article <9aR.02=i01Kp01@JUTS.ccc.amdahl.com> ked01@ccc.amdahl.com (Kim DeVaughn) writes:
>
> >So I ask again, will the 2.0 implementation be of the "files" variety, or will
> >env: be a real device (as your "BTW" below would seem to imply)?
> 
> I think I didn't say "yes" because several other people on the net said
> so already.  Yes, environment variables are files in ENV: under 2.0.

Thanks Peter (and in a subsequent posting, Andy) for the confirmation.  I did
see postings from other folks (thanks also), but with all of the various beta,
gamma, and "diga" :-) levels of "2.0" floating about, it was unclear if that
was to be the finalized implementation.  Sorry if I sounded a bit "testy" ...
I was just trying to emphasize that I really did need to know what the real
implementation method is/was to be.


> >> BTW, another big difference is your application can be automatically
> >> notified when an environment variable changes.
> >
> >Sounds like a very useful enhancement.  How's this accomplished?
> 
> You may request notification when a file changes.  DOS has a couple of
> calls (StartNotify() and EndNotify()) through which you can arrange
> to learn when a file changes.  For example, IPrefs waits on notification
> from a bunch of files including ENV:sys/pointer.ilbm.  Try saving a
> 4-color brush from DPaint to that name.  IPrefs will pick up the change
> and make it your new pointer!
> 
> Notification is very useful for Preferences and dynamic data linking.

I like it!  Very nice enhancement, and sounds like a nice, simple implemen-
tation.  Without much thinking, I can see lots of uses for this ... thanks!


BTW, congratulations on being this year's winner of the Boing! award.  Well
deserved!  And have fun carrying the "Intuition Torch" ... I suspect you'll
be in for a busy year or two ...


/kim

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From: ked01@ccc.amdahl.com (Kim DeVaughn)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Env vars under 2.0
Message-ID: <a5fA023.01G201@JUTS.ccc.amdahl.com>
Date: 5 Jul 90 08:59:47 GMT
References: <3486.AA3486@pnt.CAM.ORG> <12940@cbmvax.commodore.com> <13000@cbmvax.commodore.com>
Organization: Amdahl Corporation,  Sunnyvale, CA 94086
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