[Paraview] vtkCompositeDataIterator and GoToFirstItem()

[Utkarsh Ayachit]

GoToFirstItem() and InitTraversal() are almost equivalent, so that
should not matter. What's happening in "//do something here". Are you
sure test remains valid at the end of it?

Utkarsh

On Wed, Mar 31, 2010 at 1:41 PM, Paul Edwards <paul.m.edwards at gmail.com> wrote:
> Do you need to call InitTraversal first?
>
> Regards,
> Paul
>
> On 31 March 2010 17:30, Adriano Gagliardi <agagliardi at ara.co.uk> wrote:
>>
>> 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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