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Re: error reading file question [message #51197 is a reply to message #51196] Tue, 07 November 2006 11:34 Go to previous messageGo to previous message
David Fanning is currently offline  David Fanning
Messages: 11724
Registered: August 2001
Senior Member
Paul van Delst writes:

> pro test
> ; Setup error handler
> catch, ierr
> if(ierr ne 0)then begin
> catch, /cancel
> message, !error_state.msg + '; Closing file...', /continue
> if(n_elements(fileid) ne 0) then free_lun, fileid
> return
> endif
> ; Read non-existant file
> openr, fileid, 'newfile.dat', /get_lun
> x=0.0
> readu, fileid, x
> free_lun, fileid
> print, x
> catch,/cancel ; <--- don't forget this
> end

I wouldn't worry about forgetting to cancel
the Catch in the next to last line. CATCH
is only in effect for that program module
anyway, and you are, uh, about to leave
there. :-)

Cheers,

David

P.S. You *should* cancel the CATCH in the first
line of the error handling code, though, because--
Heaven forbid!--if you have an error in your error
handling code you are going to notice!! :-)
--
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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