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Re: catch and I/O errors [message #42873]

Thu, 03 March 2005 09:11

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> Good questions. I've forwarded them to the Book Club
> secretary. Perhaps we will get an answer. In the meantime,
> here is an article that pretty much exhausts what I know
> about the subject:
>
> http://www.dfanning.com/misc_tips/conversion_errors.html

OK, I'm trying to fix this, but I am running into semantic
problems.

According to the documentation, CATCH can catch any error
that occurs within IDL except "non-fatal warnings such
as math errors." My original understanding is that CATCH
could not catch input/output errors, and that a type
conversion error was a kind of input/output error.

But, I have verified that CATCH *can* catch normal input/output
errors. For example, you can catch the error of reading past
the end of a file. What it *can't* catch is type conversion
errors. So, using the elementary logic I learned in 8th grade,
a type conversion error must be a non-fatal math error.

All well and good EXCEPT that you can trap a type conversion
error with an ON_IOERROR condition, which would appear to
make it an input/output error. :-(

Anyone have any ideas about this?

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: catch and I/O errors By: David Fanning on Thu, 03 March 2005 09:11
		Re: catch and I/O errors By: David Fanning on Wed, 02 March 2005 16:59
		Re: catch and I/O errors By: Michael Wallace on Wed, 02 March 2005 14:35
		Re: catch and I/O errors By: David Fanning on Wed, 02 March 2005 14:05

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