comp.lang.idl-pvwave archive: archive » Re: Passing optional parameters through a wrapper routine

Home » Public Forums » archive » Re: Passing optional parameters through a wrapper routine

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Passing optional parameters through a wrapper routine [message #18837 is a reply to message #18830]

Tue, 08 February 2000 00:00

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

Kenneth P. Bowman <bowman@null.edu> wrote in message
news:bowman-0802001505360001@bowman.tamu.edu...
> The _EXTRA keyword handles passing keyword parameters through a wrapper
> routine, but what about optional parameters? If my wrapper for TVRD has
> one of my own (mandatory) parameters, do I have to do the following?
>
> PRO TVRD_WRAPPER, my_arg, x0, y0, nx, ny, channel, _EXTRA = tvrd_keywords
>
> CASE N_PARAMS() OF
> 1 : image = TVRD( _EXTRA = tvrd_keywords)
> 2 : image = TVRD(x0, _EXTRA = tvrd_keywords)
> 3 : image = TVRD(x0, y0, _EXTRA = tvrd_keywords)
> 4 : image = TVRD(x0, y0, nx, _EXTRA = tvrd_keywords)
> 5 : image = TVRD(x0, y0, nx, _EXTRA = tvrd_keywords)
> 6 : image = TVRD(x0, y0, nx, ny, channel, _EXTRA = tvrd_keywords)
> ELSE : MESSAGE, 'Incorrect number of arguments.'
> ENDCASE
> ...
>
> If I just try to pass undefined arguments through my wrapper, I get
> 'undefined variable' errors. (Is TVRD just counting the number of passed
> parameters and not checking to see if they are defined?)

Ken,

In cases like this I usually cross my arms, put my feet up on the desk, look
a person in the eye, and ask:

"How about telling me what the problem is?"

In other words, I'd like to know why you're writing a wrapper for TVRD. I've
done it myself for a number of reasons...

Cheers,
Liam.

Report message to a moderator

[Message index]

		Re: Passing optional parameters through a wrapper routine By: Mark Hadfield on Wed, 09 February 2000 00:00
		Re: Passing optional parameters through a wrapper routine By: bowman on Tue, 08 February 2000 00:00
		Re: Passing optional parameters through a wrapper routine By: davidf on Tue, 08 February 2000 00:00
		Re: Passing optional parameters through a wrapper routine By: bowman on Tue, 08 February 2000 00:00
		Re: Passing optional parameters through a wrapper routine By: Liam E. Gumley on Tue, 08 February 2000 00:00
		Re: Passing optional parameters through a wrapper routine By: davidf on Tue, 08 February 2000 00:00

Previous Topic:	Re: Object recognition
Next Topic:	call C routine on a Linux computer

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 04:28:33 PDT 2025

Total time taken to generate the page: 0.55898 seconds