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Re: error handling [message #63455 is a reply to message #1347]

Mon, 10 November 2008 07:02

bulrushmower
Messages: 19
Registered: February 2008

Junior Member

On Nov 10, 7:38 am, David Fanning <n...@dfanning.com> wrote:
> 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.")- Hide quoted text -
>
> - Show quoted text -

The problem is even I use these statements, program still halted when
enounter a bad data.
Should I place the Catch, /cancel inside the loop.
Another issue, should I state the Catch, the error right after the
beginning the loop, or after the image processing, end of the loop?

thanks

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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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