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From: duggie@Jessica.stanford.edu (Doug Felt)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Problems with XCMDs in MPW Object Pascal 3.0
Summary: try a driver
Keywords: driver
Message-ID: <862@Portia.Stanford.EDU>
Date: 13 Mar 89 17:06:06 GMT
References: <4321@sdcc3.ucsd.EDU> <26942@apple.Apple.COM> <877@internal.Apple.COM> <15634@cup.portal.com> <27155@apple.Apple.COM>
Sender: USENET News System <news@Portia.stanford.edu>
Reply-To: duggie@Jessica.stanford.edu (Doug Felt)
Organization: Stanford University
Lines: 34

In article <27155@apple.Apple.COM> keith@Apple.COM (Keith Rollin) writes:
>In article <15634@cup.portal.com> Greg_Mark_Finnegan@cup.portal.com writes:
>>
>>I have one related question (and onother somewhat unrelated):
>>
>>Is it possible to create a multisegment XCMD? Let's say for example I want
>>to somehow shoehorn a small spreadsheet (about 90K) into an XCMD. Can I
>>do it (easily)?
>
>Well, I suppose that it could be done. There are two ways that you could do
>it, but neither qualify as being easy:
>
>	1) create a multisegmented XCMD
>	2) create a 90K XCMD

A third alternative is to write a driver, and then communicate to the
driver with one or several XCMDs.  This has the advantages that you
can maintain state across calls, and use Lightspeed's ability to
create multi-segment drivers that Keith mentioned.  (I use LSC, so
don't know if LSP will do the same things for you, but perhaps it
will).  A spreadsheet could also use the driver idle time to do *very*
small pieces of a recalculation while letting Hypercard run, which
would be difficult to do in a straight XCMD.

>>Thanks in advance.
>>
>>Greg.
>
>Keith Rollin  ---  Apple Computer, Inc.  ---  Developer Technical Support

Doug Felt
Courseware Authoring Tools Project
Stanford University
duggie@jessica.stanford.edu