[Paraview] How to detect valid read in Programmable filter

[Dan Lipsa]

Hi Dennis,
Try
 isinstance(displ, vtk.numpy_interface.dataset_adapter.VTKNoneArray)

Dan


On Mon, Aug 3, 2015 at 4:40 PM Dennis Conklin <dennis_conklin at goodyear.com>
wrote:

> All,
>
>
>
> I want to try to read some point arrays in the Programmable Filter and
> take action based on whether or not the arrays have been loaded into
> Paraview.    I am pretty lost in the PF, so take that for what it’s worth.
>
>
>
> If I try something like
>
>
>
> try:
>
>    displ=block.PointData[‘DISPL’]
>
>    Print displ
>
> except:
>
>    Print ‘DISPL read failed’
>
> else:
>
>    Print ‘DISPL read succeeded’
>
>
>
> The try never fails – it always prints “DISPL read succeeded, whether I
> actually loaded the DISPL array or not.
>
>
>
> If I print displ, I get an array of values if I loaded the DISPL array
> into Paraview and a vtk.numpy_interface.dataset_adapter.VTKNoneArray object
> if I haven’t loaded the array.
>
>
>
> Not to be too dense, but how do I test to see if I got an array or a
> VTKNoneArray object?
>
>
>
> Thanks
>
>
>
> Dennis
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