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From: peirce@outpost.UUCP (Michael Peirce)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Map info in PRAM?
Message-ID: <0B010004.ivvmav@outpost.UUCP>
Date: 15 Jan 91 18:46:50 GMT
Reply-To: peirce@outpost.UUCP
Organization: Peirce Software
Lines: 36
X-Mailer: uAccess - Mac Release: 1.0.3


In article <SAAF.91Jan15094106@joker.optics.rochester.edu>, saaf@joker.optics.rochester.edu (Lennart Saaf) writes:
> 
> I am trying to access the lattitude and longitude information that is
> used by the Map cdev. I assumed that it is stored in parameter RAM,
> based partly on the fact that the MacEnvy system configuration cdev
> suggests that this is so. There are some reserved (as of IM2) bits in
> the fields that make up the PRAM record, but these don't seem to
> change when the lattitude & longitude are changed with the Map cdev.
> I can't find anything in the Map cdev itself where this info might be
> kept. Anyway, even if the Map cdev is trashed, MacEnvy still shows the
> same coordinates. I have looked in IM and the tech notes for clues but
> haven't found anything. Any clues?

Try using the script manager.  There is a call called ReadLocation
that returns a record of the following format:

	MachineLocation = RECORD
		latitude: Fract;
		longitude: Fract;
		CASE INTEGER OF
		  0:
			(dlsDelta: SignedByte); 	{signed byte; daylight savings delta}
	 	 1:
			(gmtDelta: LONGINT);		{must mask - see documentation}
		END;

There is also a WriteLocation call to make changes.  Don't muck with
the PRAM directly, use the supported calls!

-- michael


--  Michael Peirce         --   outpost!peirce@claris.com
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