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From: beard@ux1.lbl.gov (Patrick C Beard)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Finding the size of the screen under Multifinder/Color QD
Message-ID: <4594@helios.ee.lbl.gov>
Date: 9 Jan 90 15:55:54 GMT
References: <10139@saturn.ucsc.edu> <9429@hoptoad.uucp> <1102@urbana.mcd.mot.com> <10164@saturn.ucsc.edu> <9490@hoptoad.uucp> <1990Jan5.234652.4485@santra.uucp> <9530@hoptoad.uucp>
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Reply-To: beard@ux1.lbl.gov (Patrick C Beard)
Organization: Lawrence Berkeley Laboratory, Berkeley
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X-Local-Date: 9 Jan 90 07:55:54 PST

In article <9530@hoptoad.uucp> tim@hoptoad.UUCP (Tim Maroney) writes:
#
#Nope.  The OpenPort strategy doesn't work on color systems, at least
#not in the simple way you seem to be suggesting.  If you just look at
#port.portBits.bounds, you'll be looking at something weird (a handle
#followed by two integers) on color systems.
#
#	if ((port->portBits.rowBytes & 0x8000) == 0)
#		screen = port->portBits.bounds;
#	else {	PixMapHandle pm = ((CGrafPtr) port)->portPixMap;
#		screen = (*pm)->bounds;
#	}

I've used the OpenPort strategy before and it does work.  In fact, if you
just open a classic GrafPort, you don't need to go through the tests you
show above.  I have also just used the portRect field of the GrafPort
to give me the same information:

ScreenSize(Rect *r)
{
	GrafPort aPort;

	OpenPort(&aPort);
	*r = aPort.portRect;
	ClosePort(&aPort);
}

Another method is to just use the Window Manager port.
Instead of the OpenPort call above, and instead of allocating a GrafPort
on the stack you only need a GrafPtr.

ScreenSize(Rect *r)
{
	GrafPtr aPort;

	GetWMgrPort(&aPort);
	*r = aPort->portRect;
}

This seems to work on all systems I've tried.
-------------------------------------------------------------------------------
-  Patrick Beard, Macintosh Programmer                        (beard@lbl.gov) -
-  Berkeley Systems, Inc.  ".......<dead air>.......Good day!" - Paul Harvey  -
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