Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!umich!samsung!uunet!gistdev!andy
From: andy@gistdev.gist.com (Andy Warinner)
Newsgroups: comp.sys.mac.hypercard
Subject: Checking for card existance?
Keywords: HyperCard, Booga-Booga-Booga
Message-ID: <903@gistdev.gist.com>
Date: 3 May 90 13:25:37 GMT
Organization: Global Information Systems Technology Inc., Savoy, IL
Lines: 19


I have a field that stores the id of a card.  Is there any way to 
check that the id stored actually exists?  For example:

	-- bkgnd field "cardPtr" holds card id
	if verifyCard(bkgnd field "cardPtr")
		then go to card id (bkgnd field "cardPtr")
		else answer "You screw up!"

Thanks in advance,

Andrew Warinner |"The Berlin Wall is down.  That means Germans are free to go
GIST, Inc.      | wherever they want.  Hey, wasn't that the problem in 1939?"
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(Rumor has it that the upcoming release of the Caffeine Manager is 
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