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Re: Why Output Keywords Fail in cgWindow [message #85472 is a reply to message #85468]

Mon, 12 August 2013 05:25

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Fabien writes:

> I think it is more related to the use of _EXTRA keywords, isn't it?
>
> IDL> help, _EXTRA={MEMORY:1, OUTPUT:mem_out}
> % HELP: Expression must be named variable in this context: <STRING
> Array[1]>.
> % Execution halted at: $MAIN$

Yes, it is related to the use of the _EXTRA keyword. Without saving
every keyword explicitly, and then calling it explicitly, there is no
way to recover the keyword value from Call_Procedure.

I could, of course, do something like this for a handful of graphics
commands (say, the Coyote Graphics commands), by turning the graphics
commands into objects. But, I envisioned cgWindow as a program that
could work with *any* IDL graphics command, even those that I didn't
write.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Why Output Keywords Fail in cgWindow By: David Fanning on Thu, 01 August 2013 08:30
		Re: Why Output Keywords Fail in cgWindow By: Bob[4] on Sat, 03 August 2013 03:30
		Re: Why Output Keywords Fail in cgWindow By: Fabzi on Mon, 12 August 2013 02:34
		Re: Why Output Keywords Fail in cgWindow By: David Fanning on Mon, 12 August 2013 05:25
		Re: Why Output Keywords Fail in cgWindow By: Fabzi on Mon, 12 August 2013 05:41

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