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Re: Simple question regarding CATCH,/CANCEL [message #72668 is a reply to message #72667]

Tue, 28 September 2010 15:18

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

mgalloy writes:

> In my experience, typical use of CATCH, /CANCEL is like:
>
> catch, error
> if (error ne 0L) then begin
> catch, /cancel
> ... handle error ..
> endif
>
> The CATCH, /CANCEL is used to turn off CATCH-ing errors in the "...
> handle error ..." part -- this would cause a recursive loop in the error
> handling code if an error was encountered in the error handling code itself.

Outside of debugging code, this is about the only way I
ever use it, too.

I could see using it inside a function that had an
ON_ERROR, 2 condition that I wanted to temporarily
override to catch an anticipated error in the function.
When I got past the danger spot I might cancel the
Catch so that the normal RETURN from the function was
in effect.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Simple question regarding CATCH,/CANCEL By: Paul Van Delst[1] on Tue, 28 September 2010 15:51
		Re: Simple question regarding CATCH,/CANCEL By: David Fanning on Tue, 28 September 2010 15:18
		Re: Simple question regarding CATCH,/CANCEL By: Michael Galloy on Tue, 28 September 2010 14:57

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