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Re: error handling [message #63447 is a reply to message #1347]

Mon, 10 November 2008 09:23

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

bulrushmower@gmail.com schrieb:
> 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

If you can show your source, e.g. use a pastebin
we usually can better help

cheers
Reimar

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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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