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| Re: IDLgrView::GetByName [message #46218 is a reply to message #46216] |
Tue, 08 November 2005 13:23  |
Dick Jackson
Messages: 347
Registered: August 1998
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Senior Member |
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Mark Hadfield in New Zealand wrote:
> IDL> otop = oview->GetByName('top')
> IDL> ogroup = oview->GetByName('top/group')
> IDL> obox = oview->GetByName('top/group/box')
Dick Jackson in Canada wrote:
> oTop = oView -> GetByName('oTop')
> oGroup = oTop -> GetByName('oGroup')
> oBox = oGroup -> GetByName('oBox')
You'll note that both of these work fine, your choice of approach may depend
on which side of the world you're on. :-)
Cheers,
--
-Dick
Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392
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| Re: IDLgrView::GetByName [message #46219 is a reply to message #46218] |
Tue, 08 November 2005 13:14 |
Mark Hadfield
Messages: 783
Registered: May 1995
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Senior Member |
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IDLmastertobe wrote:
> Hi, I am dealing with IDLgrView object named oView, oView holds a lot of
> other objects. I am trying to get access to those objects by using
> oView->GetByName function as follows:
>
> oView -> GetByName, oTop=oTop
> oTop -> GetByName, oGroup = oGroup
> oGroup->GetByName, oBox = oBox
> oBox -> SetProperty, thick=3
>
> oTop was added to oView and oGroup was added to oTop, maybe the chain
> GetByName structure is not necessary, but i received an error message:
>
> "Attempt to call undefined method: 'IDLGRVIEW::GETBYNAME'."
>
> why is GetByName not defined in IDLgrView oView?
>
> Does anyone know why? Thanks for your time.
Well, all objects of the IDLgrView class and its subclasses should have
a GetByName method (since version 5.0, the first version in which Object
Graphcis appeared). But the problem may be that you aren't calling it
right. It takes no keyword arguments, only a single positional argument
which should be a scalar string.
Here is how you might use it
IDL> oview = obj_new('IDLgrView')
IDL> otop = obj_new('IDLgrModel', NAME='top')
IDL> oview->Add, otop
IDL> ogroup = obj_new('IDLgrModel', NAME='group')
IDL> otop->Add, ogroup
IDL> obox = obj_new('IDLgrPolygon', NAME='box')
IDL> ogroup->Add, obox
(I'm just guessing about the object types.)
Then, later, when you've lost the references to the contained objects
IDL> otop = oview->GetByName('top')
IDL> ogroup = oview->GetByName('top/group')
IDL> obox = oview->GetByName('top/group/box')
IDL> print, otop, ogroup, obox
<ObjHeapVar10009(IDLGRMODEL)><ObjHeapVar10011(IDLGRMODEL)><ObjHeapVar10013(IDLGRPOLYGON) >
--
Mark Hadfield "Kei puwaha te tai nei, Hoea tahi tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)
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| Re: IDLgrView::GetByName [message #46220 is a reply to message #46219] |
Tue, 08 November 2005 13:14 |
Dick Jackson
Messages: 347
Registered: August 1998
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Senior Member |
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Hi,
"IDLmastertobe" <shi_lee@hotmail.com> wrote in message
news:a6f3fee6b8f98956d9d1912f01028d97@localhost.talkaboutpro gramming.com...
> Hi, I am dealing with IDLgrView object named oView, oView holds a lot of
> other objects. I am trying to get access to those objects by using
> oView->GetByName function as follows:
>
> oView -> GetByName, oTop=oTop
> oTop -> GetByName, oGroup = oGroup
> oGroup->GetByName, oBox = oBox
> oBox -> SetProperty, thick=3
>
> oTop was added to oView and oGroup was added to oTop, maybe the chain
> GetByName structure is not necessary, but i received an error message:
>
> "Attempt to call undefined method: 'IDLGRVIEW::GETBYNAME'."
>
> why is GetByName not defined in IDLgrView oView?
>
> Does anyone know why? Thanks for your time.
It's defined, but it's a function, not a procedure, requiring a string to
match some object's Name property. If your oTop object was created with
Name='oTop' (and other objects named similarly), you could then do this:
oTop = oView -> GetByName('oTop')
oGroup = oTop -> GetByName('oGroup')
oBox = oGroup -> GetByName('oBox')
oBox -> SetProperty, thick=3
Online help on IDLgrView::GetByName is helpful here.
Cheers,
--
-Dick
Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392
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