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From: jongminp@cae.wisc.edu (Jong-Min Park)
Newsgroups: comp.sys.mac.apps,comp.sys.mac.hypercard
Subject: FoxBase+/Mac 2.00 and XFCN call (novice question)
Message-ID: <11551@spool.cs.wisc.edu>
Date: 23 Oct 90 21:48:56 GMT
Sender: news@spool.cs.wisc.edu
Organization: U of Wisconsin
Lines: 26

I am currently using FoxBase+/Mac 2.00 at my educational site, where
they only have a manual for PC version (:-<. I need to create a
string mapping function, so I made my first XFCN, which reads a
string argument and returns a string.

The problem is, everytime I 'CALL <XFCNname> TO result WITH arg',
heap memory is used up, and after several hundred calls, FoxBase
crashes.

My question is, does Foxbase disposes of the result handle that my
XFCN returns? I used PasToZero function prior to returning the
result string, but it wouldn't make sense to dispose of the handle
from XFCN, then return it as a result, would it? PasToZero is
the only function I used that allocates a heap.

Somebody has to dispose of the return handle, but does Foxbase
do that after calling my XFCN? Is there something I missed, such
as doing HUNLOCK or setting to PURGEABLE to the heap? (I've
referred to an example program downloaded from anon. ftp etc. and
am sure I've followed the example)

Please reply to jongminp@cae.wisc.edu if you know the answer or
at least have a Mac version of the manual (what 'CALL' command is
doing, etc.) Thank you.

Jong-Min