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From: lippin@wish-bone.berkeley.edu (The Apathist)
Newsgroups: comp.sys.mac.programmer
Subject: Re: window madness
Message-ID: <1989Oct4.184445.4500@agate.berkeley.edu>
Date: 4 Oct 89 18:44:45 GMT
References: <2485@dogie.macc.wisc.edu> <3143@ilium.cs.swarthmore.edu>
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Recently jackiw@ilium (Nick Jackiw) wrote:

>You can use GetWMgrPort (WindowManager chapter, IM-1) to get a GrafPtr to
>the window-manager port, which contains all visible screen real estate
>(or multiple screen realty, if you have the luxury). Then you'd SetPort to
>this before drawing, and repeatedly (WMgr)LocalToGlobal and GlobalTo(your-
>port)Local coordinates between the two ports.

A number of very strange occurances while trying this sort of thing
have convinced that Apple means it when they say "If you touch the
window manager port, you die."

A safer way is to make your own port, using OpenPort.  This gives you
the whole screen to play with, and you don't have to worry about the
system depending on the port's fields in some obscure way.

Again, do put the screen back the way you found it before letting
other programs get any time; they aren't expecting to have their
windows stomped on.

Finally, there is a tech note on this subject; it would be best to
read it before trying any of this.

					--Tom Lippincott
					  lippin@math.berkeley.edu

	"Thank you for observing all saftey precautions."
					--Dark Star