[vtkusers] Error accessing vtkDataArray from vtkDataSet object

[shawn mckenzie]

I am attempting to access data arrays from my vtkDataSet objects.
vtkDataSet->GetPointData->GetScalars should be accessible for all vtkDataSet
types, i believe.

my code:

vtkDataSet *output = vtkDataSet::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));
outPD = output->GetPointData();
vtkDataArray *scalarArray = outPD->GetScalars();

In this case i have a vtkPolyData input. When i attempt to print the number
of components, my program crashes without error:

myOutputFile << scalarArray->GetNumberOfComponents();

Has anyone encountered this problem? any help apreciated

thank you
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