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From: urlichs@smurf.sub.org (Matthias Urlichs)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Breaking out of a series of routines
Message-ID: <5[-ge2.-n@smurf.sub.org>
Date: 10 Jul 90 17:32:21 GMT
References: <25526@cs.yale.edu> <5252@plains.UUCP>
Organization: University of Karlsruhe, FRG
Lines: 24

In comp.sys.mac.programmer, article <5252@plains.UUCP>,
  puklich@plains.UUCP (Blayne Puklich) writes:
< tarr-michael@CS.Yale.EDU (michael tarr) wrote in article Breaking out of a
< 	series of routines:
< >On an error condition I wish to immediately stop processing a large file
< >and break out of about 10 routines that have been calling each other and
< >return to my main event loop. Is there any way to do this without
< >passing and error flag to each of the calling routines?
< 
< You can use the setjmp() and longjmp() pair of functions to do this, assuming
< you're using C.  I'm not very familiar with these, but with a bit of
< experimentation and manual reading, you should be able to figure out how
< to use these functions.
< 
Using the Signal mechanism (as in MacApp / TechNote 88 / SampleCode XX (I
don't remember right now) works for both C and Pascal, and you can intercept
it in one of the 8 intermediate routines if you have to do some postprocessing
if an error occurs (closing/deleting files, deallocating memory, whatever).

I use it in all my programs -- works great.

-- 
Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de
Humboldtstrasse 7 - 7500 Karlsruhe 1 - FRG -- +49+721+621127(Voice)/621227(PEP)