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Re: Object Method validity [message #36206 is a reply to message #36200]

Mon, 11 August 2003 15:08

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Robert Moss wrote:
> Is there a way to verify the existance of a particular object method?
> Something like
>
> valid = Method_Valid( theObject, "HopedForMethod" )
>
> I guess. I've spent a little while rtfm-ing and googling to no avail.

I believe that the only generally valid approach is to call the method
and trap any errors with a CATCH statement. This has the advantage(??)
of actually calling the method and checking that your parameters are
valid. Something like this (Warning: I haven't checked it and haven't
generalised it to handled function-type methods)...

catch, err
if err ne 0 then begin
valid = 0B
goto, finished
endif
call_method, theObject, 'HopedForMethod', param0
valid = 1B
catch, /CANCEL
finished:

But be aware that if HopedForMethod is not bound to the class that
theObject belongs to, then IDL will spend a significant amount of time
searching the path for a file with the name

obj_class(theObject)+'__hopedformethod.pro'

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: Object Method validity By: Robert Moss on Fri, 15 August 2003 06:54
		Re: Object Method validity By: btt on Thu, 14 August 2003 04:41
		Re: Object Method validity By: Mark Hadfield on Wed, 13 August 2003 14:37
		Re: Object Method validity By: Craig Markwardt on Wed, 13 August 2003 10:00
		Re: Object Method validity By: Pavel Romashkin on Tue, 12 August 2003 15:10
		Re: Object Method validity By: Mark Hadfield on Tue, 12 August 2003 15:15
		Re: Object Method validity By: rmmoss on Tue, 12 August 2003 06:34
		Re: Object Method validity By: Mark Hadfield on Mon, 11 August 2003 15:08

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