comp.lang.idl-pvwave archive: archive » Re: IDL objected oriented question

Home » Public Forums » archive » Re: IDL objected oriented question

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

Re: IDL objected oriented question [message #34666 is a reply to message #34664]

Tue, 08 April 2003 09:53

btt
Messages: 345
Registered: December 2000

Senior Member

Sabir Pasha wrote:

>
> Basically
>
> define = { ClassA, $
>
> ObjectB: Obj_New()}
>
> END
>
> the object gets defined in
> ObjectB = Obj_New("ClassB")
>
> And somewhere we define ObjectA
>
> ObjectA = Object_New("ClassA)
>
> and now in an event handler far far away
>
> Sinfo.objectA.objectB->member function
>
> doesnt' work because we cannot access Objects A's member variables
> only member functions.

Hi,

I think you have a couple of choices. The easiest and 'safest' is to
provide access to the properties (member variables) of ObjA via the
GetProperty method.

ObjA->GetProperty, ObjectB = ObjB

ObjB->DoMyMemberMethodThing

You would include, in this case, an OBJECTB = OBJECTB keyword in
ObectA's GetProperty method.

PRO OBJECTA::GetProperty, OBJECTB = OBJECTB, etc=etc

;did the caller ask for objectB?
If ARG_PRESENT(ObjectB) then ObjectB = ObjectB

;other stuff

END ; GetProperty

This does make you go through two (or more programmatic steps) but it
does the job nicely.

You know, if object A is behaving like a container object, then perhaps
you could make OBJECTA inherit the properties and methods of
IDL_CONTAINER? Then you would have easy access to all of the
objectBs, objectCs, etc. Makes cleanup and transport issues a snap.
And if you like that idea, try using Martin Schultz's flavor of
IDL_CONTAINER (called MGS_CONTAINER) which has a handy method for
finding contained objects by name (assuming each object contained has a
name, of course.)

Cheers,
Ben

Report message to a moderator

[Message index]

		Re: IDL objected oriented question By: tam on Thu, 10 April 2003 05:49
		Re: IDL objected oriented question By: Randall Skelton on Wed, 09 April 2003 23:34
		Re: IDL objected oriented question By: David Fanning on Wed, 09 April 2003 12:52
		Re: IDL objected oriented question By: Pavel Romashkin on Wed, 09 April 2003 09:33
		Re: IDL objected oriented question By: David Fanning on Wed, 09 April 2003 06:50
		Re: IDL objected oriented question By: pashas77 on Wed, 09 April 2003 06:40
		Re: IDL objected oriented question By: David Fanning on Tue, 08 April 2003 20:19
		Re: IDL objected oriented question By: Mark Hadfield on Tue, 08 April 2003 15:26
		Re: IDL objected oriented question By: David Fanning on Tue, 08 April 2003 10:11
		Re: IDL objected oriented question By: btt on Tue, 08 April 2003 09:53
		Re: IDL objected oriented question By: JD Smith on Sat, 12 April 2003 21:35

Previous Topic:	Re: ENVI band math: "b1 gt b2 " , "(b1-b2) gt 0" same or not?
Next Topic:	Question on ENVI 3.6

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 19:31:50 PDT 2025

Total time taken to generate the page: 0.00359 seconds