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Re: eval [message #50521 is a reply to message #50392]

Wed, 04 October 2006 14:21

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Dometz writes:

> So for example for OPENU, I want to create a wrapper function that will
> do some logging and the call the original OPENU:
>
> example:
> PRO LOG_OPENU, UNIT, FILE, APPEND=APPEND, COMPRESS=COMPRESS,
> BUFSIZE=BUFSIZE, DELETE=DELETE, ERROR=ERROR,
> F77_UNFORMATTED=F77_UNFORMATTED, GET_LUN=GET_LUN, MORE=MORE,
> NOEXPAND_PATH=NOEXPAND_PATH, STDIO=STDIO, SWAP_ENDIAN=SWAP_ENDIAN, $
> SWAP_IF_BIG_ENDIAN=SWAP_IF_BIG_ENDIAN,
> SWAP_IF_LITTLE_ENDIAN=SWAP_IF_LITTLE_ENDIAN, VAX_FLOAT=VAX_FLOAT,
> WIDTH=WIDTH, XDR=XDR, RAWIO=RAWIO
> print, FILE
> print, SWAP_IF_BIG_ENDIAN
> ;print etc...
> ;Now here would like to call the original method but I have to call
> it only with the named arguments that are set
> OPENU, ...?
>
> So, either I could have a LOOOONG list of if or case statements or I
> maybe I could use _EXTRA?

This is exactly what _EXTRA is used for. Note that if you
want to use output keywords and get information *back* from
your LOG_OPENU procedure, you should use _REF_EXTRA instead
of _EXTRA. And if you want to be sure that ONLY keywords
for OPENU are passed in, you should use _STRICT_EXTRA. I just
noticed there is no _STRICT_REF_EXTRA, but I guess I've never
really needed it, so probably that's why. :-)

> Or:
> I would need to build the method call dynamically:
> 1) Is there a hack around this so that I could use call_function,
> call_procedure or call_method dynamically?

There is no reason to use CALL_PROCEDURE here, since you know
*exactly* what procedure you want to call: OPENU. You might
use CALL_PROCEDURE if you didn't know until run-time whether
you wanted to call OPENU, or OPENR, or OPENW, for example.

Cheers,

David
--
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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[Message index]

		eval By: Dominic Metzger on Tue, 03 October 2006 17:53
		Re: eval By: Dominic Metzger on Wed, 04 October 2006 22:36
		Re: eval By: wlandsman@jhu.edu on Wed, 04 October 2006 19:40
		Re: eval By: David Fanning on Wed, 04 October 2006 16:13
		Re: eval By: Michael Galloy on Wed, 04 October 2006 15:56
		Re: eval By: David Fanning on Wed, 04 October 2006 14:21
		Re: eval By: JD Smith on Mon, 09 October 2006 10:51
		Re: eval By: Dominic Metzger on Wed, 04 October 2006 12:22
		Re: eval By: Braedley on Wed, 04 October 2006 12:12
		Re: eval By: Maarten[1] on Wed, 04 October 2006 00:53
		Re: eval By: Dominic Metzger on Tue, 03 October 2006 21:29
		Re: eval By: David Fanning on Tue, 03 October 2006 18:51
		Re: eval By: Dominic Metzger on Tue, 03 October 2006 18:25
		Re: eval By: David Fanning on Tue, 03 October 2006 18:13

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