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Re: Generating errors [message #51362 is a reply to message #51358]

Thu, 16 November 2006 07:47

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Braedley writes:

> Is the any way to generate a generic error if a given condition fails?
> For example:
>
> catch, the_error
> if the_error ne 0 then begin
> ;fix what needs to be fixed
> catch, /cancel
> return ;so the user can try again
> endif
>
> ;some other code
>
> if n ne (*state).m then begin
> ;do something to notify user
> ;throw the error
> endif
>
> ;some more code that may generate errors
>
>
> BTW, this is in the event handler of a widget program, and it's assumed
> that the problem can be fixed before the user tries again.
> Is there any well defined mechanism to do what I want, or do I have to
> do something like
>
> a=intarr(3)
> a[4]=0
>
> in order to generate my error?

If you are going to fix the error, then you want it fixed
in THIS module. Don't RETURN out of your error handler code!
(Unless you plan to fix something that is in the state or
info structure.) If you don't RETURN, you will run through
the code again. (The CATCH, /CANCEL in your error handler
code will prevent you from getting into an infinite loop
if you don't *completely* fix the problem! :-)

In terms of throwing an error, the MESSAGE command is usually
used for this purpose. See the document ion for my ERROR_MESSAGE
program for how to Catch and Throw errors.

Cheers,

David

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: Generating errors By: David Fanning on Thu, 16 November 2006 09:50
		Re: Generating errors By: Braedley on Thu, 16 November 2006 09:47
		Re: Generating errors By: David Fanning on Thu, 16 November 2006 09:27
		Re: Generating errors By: Braedley on Thu, 16 November 2006 09:13
		Re: Generating errors By: David Fanning on Thu, 16 November 2006 07:47

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