Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!brunix!Andrew_Gilmartin@Brown.EDU
From: Andrew_Gilmartin@Brown.EDU
Newsgroups: comp.sys.mac.hypercard
Subject: External Windows and Activate event
Keywords: external window,activate event
Message-ID: <78140@brunix.UUCP>
Date: 11 Jun 91 13:03:42 GMT
Sender: news@brunix.UUCP
Organization: Brown University
Lines: 23

I have been developing an external window for HyperCard 2.x over the last
several weeks. One of its features is to send to the card  "resumeWindow" and
"suspendWindow" messages when HyperCard sends it, respectively, activate and
deactivate events. However, if you call SendCardMessage() during an activate or
deactivate event HyperCard crashes. I have worked-around this problem by
delaying sending the resume- and suspendWindow messages until the next null
event.

The problem with this  work-around is that the resume- and suspendWindow
messages should act like resume- and suspendStack in that they don't get sent
when the lockmessages has been set to true. My work-around fails to act
correctly here because to determine the status of the lockmessages during an
activation event requires that I can EvalExpr() which, like SendCardMessage(),
causes HyperCard to crash. Unfortunately, I have not yet found a work-around.
(Note: HyperCard sets lockmessages to false when it is idle and it is only
after this occures that my external window gets a null event.)

Has anyone solved this problem? Is HyperCard's crashing the result of a bug?

-- Andrew Gilmartin
   Computing & Information Services
   Brown University
   Andrew_Gilmartin@Brown.Edu