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Re: error handling [message #63456 is a reply to message #1347]

Mon, 10 November 2008 05:38

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Spon writes:

> bulrushmo...@gmail.com writes:
>> How can I set up that when error happens, IDL output the error message
>> to log file, then igonore that step continue to process next data?.
>
> Something like this:
>
> � OpenW, lun, 'logfile.out', /GET_LUN
> � FOR j=0,n DO BEGIN
>
> � � �Catch, theError
> � � �IF theError NE 0 THEN BEGIN
> � � � � PrintF, lun, 'Problem with processing step ' + StrTrim(j)
> � � � � CONTINUE
> � � �ENDIF
>
> � � �DoSomeProcessing, data[j]
> � ENDFOR
> � Catch, /Cancel
> � Free_Lun, lun
>
> Excuse my ignorance on this, but wouldn't you need to stick your
> "Catch, /Cancel" INSIDE the for loop?
> If not, why not?

There is no requirement for when you cancel a CATCH, except
you should cancel it when you are finished with it. While CATCH
is in effect, any error is re-routed to the first line after
the CATCH statement. When cancelled, any error is routed
to the ON_ERROR condition in effect for that program
module. In a real code example, rather than cancelling
the CATCH there, I would probably have had another CATCH
statement to replace the one I was using for the process
loop.

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]

		error handling By: jabarone on Thu, 26 August 1993 11:44
		Re: error handling By: bulrushmower on Mon, 10 November 2008 11:42
		Re: error handling By: bulrushmower on Mon, 10 November 2008 11:06
		Re: error handling By: David Fanning on Mon, 10 November 2008 10:12
		Re: error handling By: bulrushmower on Mon, 10 November 2008 09:54
		Re: error handling By: R.Bauer on Mon, 10 November 2008 09:23
		Re: error handling By: David Fanning on Mon, 10 November 2008 07:11
		Re: error handling By: bulrushmower on Mon, 10 November 2008 07:02
		Re: error handling By: David Fanning on Mon, 10 November 2008 05:38
		Re: error handling By: Spon on Mon, 10 November 2008 04:40
		Re: error handling By: David Fanning on Sun, 09 November 2008 20:59
		Re: error handling By: bulrushmower on Sun, 09 November 2008 20:40
		Re: error handling By: bulrushmower on Sun, 09 November 2008 17:20
		Re: error handling By: David Fanning on Sun, 09 November 2008 16:24

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