[vtkusers] A probably simple question about VTK smart pointers

[David Cole]

I've been told that "The argument to Register/UnRegister is only used 
when printing debugging messages so that the human knows what is 
referencing the object."

You should balance your call to Register with a call to UnRegister (as 
opposed to Delete), also passing NULL as the parameter. In this case, 
it's probably six of one, half-dozen of the other, but Reg/UnReg are 
there to balance each other, so you should use them that way.

Hope this helps,
David

Hendrik Belitz wrote:

>Hello fellow vtk users,
>
>I have a probably simple question about VTK smart pointers. I want to use a 
>VTK class (externalDataPtr or Type vtkImageData* in my case ), generated by a 
>VTK pipeline, in a class which doesn't inherit vtkBaseObject. To make sure 
>that the vtkImageData* isn't deleted by the pipeline, I need to manually 
>increase the reference count by calling
>
>externalDataPtr->Register( NULL );
>
>and decrease the reference count afterwards by
>
>externalDataPtr->Delete();
>
>I'm wondering if giving a NULL pointer to the Register() function is correct 
>(I assume that I need to give a pointer to the object which references my 
>imageData here, which I can't, since my class does not inherit 
>vtkBaseObject), since this parameter isn't documented well in the online 
>documentation. Could anybody give me clue on what this parameter is actually 
>good for?
>
>Regards
> Hendrik
>
>-------------------------------------------------------------------------------------
>Dipl.-Inform. Hendrik Belitz
>Central Institute of Electronics / Zentralinstitut für Elektronik 
> Multimodal image processing workgroup / AG Multimodale Bildverarbeitung
>Research Center Juelich / Forschungszentrum Jülich GmbH
>D-52428 Jülich, Germany
>Tel.: (++49)2461 61 8701 Fax: (++49)2461 61 3990
>email: h.belitz at fz-juelich.de
>ggp-key available via http://pgpkeys.pca.dfn.de
>  
>
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