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Re: Help with pick menu widget code [message #12874 is a reply to message #12872]

Thu, 17 September 1998 00:00

rmlongfield
Messages: 68
Registered: August 1998

Member

HI All,
In article <MPG.10697a29e82919e09896b3@news.frii.com>,
davidf@dfanning.com (David Fanning) wrote:
A lot of interesting stuff about errors but this one confuses me:
>
> To make the error propagate all the way up, you have to turn
> any CATCH error handling off in the module that is causing
> the error, and you have to turn it off for XManager. You
> do this by typing this command on the IDL command line
> *before* you run your program:
>
> IDL> XManager, Catch=0
>
> Now when you run the program, you get this error message:
>
> % WIDGET_CONTROL: Invalid widget identifier: 3.
> % Execution halted at: PICKFINISH_EVENT 323 C:\RSI\IDL51\david\junk.pro
>
> I can go to line 323 in my code and try to figure out why the only
> widget identified there (event.top) is somehow invalid. It may
> only take me a half-hour to realize that I just killed the sucker. :-)

Does this mean that I have to know before-hand that my module is going to
cause an error? (Isn't this rather pessimistic) Or, I guess it is a good
de-bugging technique, to be applied AFTER the program crashes. In this case I
will try it out.

I haven't had much luck with error handling in IDL. It usually causes me more
trouble because I don't notice that an error has occurred. I tried handling
the error by skipping over some code and printing,'you have an error'. This
statement frequently gets printed without me noticing until somewhere else
the program notices that I skipped over something and THERE is where the
error occurs. These days I just let the program crash and then try to fix
it. ("ambulance down in the valley " thinking).

I recently discovered SOUND among Ray Stern's programs. (If he could do it
with a SUN, I can do it with a SGI.) This way I can hear that something is
wrong. (A few well chosen Darth Vader sounds would be suitable, I think. )

Good luck with the widgets, Doug!

Rose

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[Message index]

		Re: Help with pick menu widget code By: davidf on Thu, 17 September 1998 00:00
		Re: Help with pick menu widget code By: rmlongfield on Thu, 17 September 1998 00:00
		Re: Help with pick menu widget code By: davidf on Wed, 16 September 1998 00:00
		Re: Help with pick menu widget code By: davidf on Wed, 16 September 1998 00:00
		Re: Help with pick menu widget code By: Doug Larson on Wed, 16 September 1998 00:00
		Re: Help with pick menu widget code By: davidf on Wed, 16 September 1998 00:00
		Re: Help with pick menu widget code By: rmlongfield on Wed, 16 September 1998 00:00
		Re: Help with pick menu widget code By: davidf on Tue, 15 September 1998 00:00

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