[vtkusers] vtkIdTypeArray GetValue segfault?

[David Doria]

I get an vtkIdTypeArray called "ids" like this:

vtkIdTypeArray* ids;
ids =
vtkIdTypeArray::SafeDownCast(selectedGraph->GetVertexData()->GetArray("vtkIdFilter_Ids"));

Then I check that it is valid:

if(!ids)
  break;

Then I check that it has the correct number of tuples:

std::cout << "ids has " << ids->GetNumberOfTuples() << " tuples." <<
std::endl;

Then I try to get a value from it:

 for(vtkIdType i = 0; i < ids->GetNumberOfTuples(); i++)
    {
    vtkIdType id = ids->GetValue(i); //segfault occurs here

but a segfault occurs where indicated above.

Anyone know why this might happen? Or what other conditions to check before
trying to access the data?

Thanks,

David
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