Path: utzoo!attcan!uunet!cs.utexas.edu!asuvax!mcdphx!udc!willcox
From: willcox@urbana.mcd.mot.com (David A Willcox)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: XCMD's cannot set global variables.
Message-ID: <1266@urbana.mcd.mot.com>
Date: 25 May 90 13:37:03 GMT
References: <3707@darkstar.ucsc.edu>
Organization: Motorola Microcomputer Division, Urbana, IL
Lines: 19

In article <3707@darkstar.ucsc.edu> sirkm@ssyx.ucsc.edu (Greg Anderson) writes:

>I believe that the book "XCMD's for HyperCard" by Gary Bond mentions that
>XCMDs cannot create global variables.  His solution, if I recall, is to
>create a new button (from within the XCMD), give it a script that references
>the global variable & then do a callback to it.

Am I missing something?  I don't have any documentation available here
at work, but I could swear that there are a pair of callbacks called
something like GetGlobal() and SetGlobal() that let you get and set
globals from an XCMD.  I've used them, and they work.  It's the only
way I know of to keep some memory around between invocations of an
XCMD.  (Allocate a handle, convert its address to something ASCII,
store it in a global.)

David A. Willcox
Motorola MCD - Urbana		UUCP: ...!uiucuxc!udc!willcox
1101 E. University Ave.		INET: willcox@urbana.mcd.mot.com
Urbana, IL 61801		FONE: 217-384-8534