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openr and /get_lun [message #19741]

Fri, 14 April 2000 00:00

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

I have noticed that the use of /GET_LUN and ERROR keywords to openr is
not as helpful as I would have hoped. Do other have this experience?
The problem is that when an error occurs, it is hard to know whether
the file unit was "gotten" or not.

For example:

pro test1
openr, unit, filename, /get_lun, error=err
free_lun, unit
end

If there was an error, then it is possible that UNIT was never set,
and is hence undefined. FREE_LUN doesn't take undefined variables.

If there is error checking to do, I don't know exactly what it should
be. So I find myself explicitly doing this instead:

pro test2
get_lun, unit
openr, unit, filename, error=err
free_lun, unit
end

Comments?

Craig

--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		openr and /get_lun By: Craig Markwardt on Fri, 14 April 2000 00:00
		Re: openr and /get_lun By: Joseph B. Gurman on Thu, 20 April 2000 00:00
		Re: openr and /get_lun By: John-David T. Smith on Mon, 17 April 2000 00:00
		Re: openr and /get_lun By: mallors on Mon, 17 April 2000 00:00
		Re: openr and /get_lun By: mallors on Mon, 17 April 2000 00:00
		Re: openr and /get_lun By: Craig Markwardt on Mon, 17 April 2000 00:00
		Re: openr and /get_lun By: John-David T. Smith on Mon, 17 April 2000 00:00

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