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Re: Object Method validity [message #36200 is a reply to message #36190]

Tue, 12 August 2003 06:34

rmmoss
Messages: 12
Registered: August 1995

Junior Member

Mark Hadfield <m.hadfield@niwa.co.nz> wrote in message news:<bh9457$ctm$1@newsreader.mailgate.org>...
> 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'

That's what I was afraid of. Oh well, time for another minor feature
request. Thanks for taking the time to answer.

Robert

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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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