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Re: Hoping ON_IOERROR would catch errors in IDLs subroutines. [message #64937]

Tue, 03 February 2009 19:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

M. Katz writes:

> I'm trying to understand why ON_IOERROR doesn't catch an error that
> occurs with writing an image to the disk. Here's an example where I
> attempt to write an image to an intentionally nonexistent folder (see
> below).
>
> When I run the program it breaks at WRITE_PNG instead of jumping down
> to BAD_IO. However, if I change the WRITE_PNG to an OPENW, then it
> catches the error and redirects the flow the BAD_IO.
>
> What is the proper protocol to catch file errors in routines that IDL
> provides, and handle them in the parent procedure?

I pretty much handle everything with CATCH. I've never
had a problem with it.

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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		Re: Hoping ON_IOERROR would catch errors in IDLs subroutines. By: David Fanning on Tue, 03 February 2009 19:49
		Re: Hoping ON_IOERROR would catch errors in IDLs subroutines. By: Michael Galloy on Tue, 03 February 2009 15:40

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