From: ldo@waikato.ac.nz (Lawrence D'Oliveiro, Waikato University)
Newsgroups: comp.sys.mac.hypercard
Subject: HyperCard won't let me do libraries!?
Date: 17 Nov 92 10:40:28 +1300
Organization: University of Waikato, Hamilton, New Zealand

I have these large collections of XCMDs and XFCNs for doing QuickDraw stuff,
QuickTime stuff, and other stuff. I've used them in a number of stacks, and
then I had this brilliant idea: instead of going through the trouble of
installing them into every new stack where I need them (and consuming all that
disk space with extra copies), why not create some shared library stacks?
I could just use the "start using" command to make these libraries available
to client stacks.

The scheme I came up with was slightly more elaborate than this. Each of my
library stacks responds to a couple of custom messages I called "StartUsing"
and "StopUsing". Each library keeps a reference count of the number of clients
using it at once. This way you can have multiple client stacks open
simultaneously in HyperCard, and they won't interfere with one another.

But I hit a snag--namely, a bug in HyperCard. The library stack correctly
appears in the "StacksInUse" list, but when I try invoking an external from
that library, HyperCard just beeps at me. I can make it come right if I try
again a second time, but it always fails that first time.

I've enclosed a bare-bones example, with a fuller description of the problem.
Feel free to try it out.

Lawrence D'Oliveiro                       fone: +64-7-856-2889
Computer Services Dept                     fax: +64-7-838-4066
University of Waikato            electric mail: ldo@waikato.ac.nz
Hamilton, New Zealand    37^ 47' 26" S, 175^ 19' 7" E, GMT+13:00
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Newsgroups: comp.sys.mac,comp.sys.mac.misc,comp.sys.ibm.pc.misc