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Re: Is that window open?? [message #8570 is a reply to message #8562]

Wed, 02 April 1997 00:00

hegde
Messages: 17
Registered: December 1995

Junior Member

In article <33427754.41C6@irc.chmcc.org>, Phil Williams <williams@irc.chmcc.org> writes:
> How would I check to see if a window ID is still open in a widget
> program?
>
> Here's what I did
> oldwin = !d.window
> wset, info.wid
>
> ; some code here
>
> ;--- restore the oldwin
> wset, oldwin
>
> and it crashes with
> % WSET: Window is closed and unavailable.

Use CATCH to trap the error signal and act accordingly. For example:

oldwin = !d.window
WSET, info.wid

; some code here

CATCH, err_status
CASE err_status OF
-324 : BEGIN
; do what you want when the window is closed
PRINT, 'warning ........'
END

ELSE : WSET, info.wid
ENDCASE

CATCH, err_status, /CANCEL

As in any other structured language, IDL doesn't define these error signals
as constants. Hence programmer is at a disadvantage, if RSI changes them with
each version.

Hope it helps.

-M. Hegde

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[Message index]

		Re: Is that window open?? By: David Foster on Thu, 03 April 1997 00:00
		Re: Is that window open?? By: steinhh on Thu, 03 April 1997 00:00
		Re: Is that window open?? By: hegde on Wed, 02 April 1997 00:00
		Re: Is that window open?? By: David Foster on Wed, 02 April 1997 00:00
		Re: Is that window open?? By: Tim Patterson on Wed, 02 April 1997 00:00
		Re: Is that window open?? By: brian.jackel on Wed, 02 April 1997 00:00

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