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From: lemke@radius.com (Steve Lemke)
Newsgroups: comp.sys.mac.hypercard,comp.sys.mac.programmer
Subject: Re: global variables in code resources
Keywords: global variables, code resources, XCMD's, XFCN's
Message-ID: <1296@radius.com>
Date: 26 Jul 90 01:51:34 GMT
References: <12642@june.cs.washington.edu>
Followup-To: comp.sys.mac.hypercard
Lines: 46

moore@cs.washington.edu (Charles Moore) writes:

>I am becoming increasingly frustrated by the prohibition against
>global variables in code resources.  Is there any way around this?

>One possibility for me, since I am writing a HyperCard XFCN is to make
>callbacks to HyperCard and use HyperCard globals.  I'd like to avoid
>this, though, since I assume callbacks to HyperCard will generally be
>slow.  Also, it seems inelegant since I won't need this information
>anymore when my XFCN completes.

>Does anybody have any suggestions?

Sure.  Use THINK Pascal 3.0.  I quote from the manual (page 157):

     Global data in code resources:

     Code resources cannot have global data.  You can take advantage
     of Pascal's nested procedures to simulate global data.  Just nest
     all of the routines in your program within "main".

Thus you would have something like this:

unit blah;
interface
    procedure main;
implementation
    procedure main;
    var
    global:integer;
       procedure other;
       begin
       end;
       procedure another;
       main
       end;
    begin
    end;
end.

>Charles Moore

--Steve
-- 
----- Steve Lemke, Engineering Quality Assurance, Radius Inc., San Jose -----
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