[vtkusers] Problem with vtkTable and vtkVariantArray

Roger Blum rogerblum at hawaii.rr.com
Tue Mar 31 23:54:05 EDT 2009

Hi Jeff,

Thanks a lot for your explanations which led to a working solution.

Do you have any idea if and when the situation with vtkVariant will be
solved? The ability to use GetValue on a vtkVariantArray (or vtkTable)
would provide a much cleaner and simpler solution.


Jeff Baumes wrote:
> On Tue, Mar 31, 2009 at 5:08 AM, Roger Blum <rogerblum at hawaii.rr.com> wrote:
>> My questions:
>> - Is there an easier way to extract the data from the vtkRowQuery
>>  object?
> Your way is the easy way to do it in C++, but it is not currently
> available in wrapped languages. The problem is vtkVariant, which is a
> lightweight, stack-based object that does not subclass from vtkObject.
> No methods that take or return a variant are wrapped.
>> - Why is method GetValue with 2 params invalid when the online doc
>>  tells me this method exists? Maybe a wrapping problem?
> Yes, it is a wrapping issue.
>> - How else can I read the values of vtkTable and/or vtkVarianArray
> vtkTable's data is internally stored as a collection of arrays that
> are uniformly-typed, just like attributes of other data objects in
> VTK. You can access the columns through table->GetColumn(i) or
> table->GetColumnByName(name), which are wrapped. The column array
> types should match the types in the database. vtkVariantArray is
> currently essentially unaccessable through wrappers, since you cannot
> set or retrieve values.
>> - Are there any examples available for the newer Vtk classes?
> Some of the newer data objects (table, graph, tree) were made
> primarily for the infovis effort in VTK. See Examples/Infovis and the
> tests in Infovis/Testing/Cxx and Views/Testing/Cxx. Some rudimentary
> documentation is available for Titan (i.e. infovis in VTK) at
> http://www.sandia.gov/Titan and http://www.kitware.com/InfovisWiki.
> There are plenty of other new classes; search for tests or examples
> that use them in the VTK repository.
> Jeff
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