[Paraview] vtkCompositeDataIterator and GoToFirstItem()

[Adriano Gagliardi]

Sorry, I forgot to mention that. The seg fault occurs when the new
vtkCompositeDataIterator is created at i=1. I just realised the first block
of code I posted was wrong anyway. This is the correct (but not working)
routine:

      for ( vtkIdType i = 0; i != max; ++i ) {
        vtkCompositeDataIterator* iter = test->NewIterator();
        iter->GoToFirstItem();
        for ( int j = 0; j != test->GetNumberOfBlocks(); ++j ) {
          //do something here

	    iter->GoToNextItem();
        }
        iter->Delete();
      }

I'm assuming that what I'm trying just isn't possible, but it would be nice
to know if there is a way of achieving this.

Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk 
-----Original Message-----
From: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com] 
Sent: 31 March 2010 17:23
To: agagliardi at ara.co.uk
Cc: ParaView
Subject: Re: [Paraview] vtkCompositeDataIterator and GoToFirstItem()

You might want to attach a debugger and produce a stack trace to see where
you are getting a segfault.



On Wed, Mar 31, 2010 at 12:12 PM, Adriano Gagliardi <agagliardi at ara.co.uk>
wrote:
>
> I'm using the vtkCompositeDataIterator to iterate over a multiblock 
> data-set multiple times. I'd like to reuse the iterator I create in 
> the first instance by using GoToFirstItem after it has finished the 
> traversal, but I'm getting a segmentation fault. Is this possible or am I
doing this wrong?
> Example code below:
>

>      
>
> It works when the for loops are switched around. I'm just interested 
> to see what the performance difference is between them:
>
>        vtkCompositeDataIterator* iter = test->NewIterator();
>      iter->GoToFirstItem();
>        for ( int j = 0; j != test->GetNumberOfBlocks(); ++j ) {
>        for ( vtkIdType i = 0; i != max; ++i ) {
>          //do something here
>        }
>        iter->GoToNextItem();
>      }
>      iter->Delete();
>
> Cheers,
>
> Adriano
>
> ===================================
>
> Adriano Gagliardi MEng PhD
> Business Sector Leader
> Computational Aerodynamics
> Aircraft Research Association Ltd.
> Manton Lane
> Bedford
>
> Tel: 01234 32 4644
> E-mail: agagliardi at ara.co.uk
> Url: www.ara.co.uk
>
>
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Aircraft Research Association Ltd.  Registered in England, Registration No 503668 Registered Office: Manton Lane, Bedford MK41 7PF England VAT No GB 196351245