[Paraview-developers] Get data from server to client (helper?)

[Biddiscombe, John A.]

A filter generates some data and makes it available via
GetHistogramData() - it could be a vtkInt/DoubleArray or even a vtkImageData depending on use.

        <ProxyProperty name="Histgram"
                       command="GetHistogramData"
                       informationonly=1>
        </ProxyProperty>

How can I access this in the client?

Trying this ...

  vtkSMProperty *histoarray = repr->getProxy()->GetProperty("Histogram");
  if ( histoarray != 0) {
      vtkSMProxyProperty *temp = vtkSMProxyProperty::SafeDownCast(histoarray);
      temp->GetProxy(0)->UpdatePropertyInformation();

      vtkIntArray *histogramvalues = vtkIntArray::SafeDownCast(temp->GetProxy(0)->GetClientSideObject());
      std::cout << "Here" << std::endl;
  }

results in a segfault at the GetClientSideObject. I was hoping that I could get the data transferred across using a vtkDataObject and then access it, but it doesn't work as I had hoped.

I'm aware that I could use an vtkIntVectorProperty and then an simpleIntVectorPopertyHelper, but this was much too slow when I tried before, so I hoped to be able to use a dataset or data array directly. There doesn't seem to be a helper for a vtkDataSet (imagedata would be lovely as I want to transfer some 2D arrays as well).

Is there an example in the source that does this?

ta

JB

--
John Biddiscombe,                        email:biddisco @.at.@ cscs.ch
http://www.cscs.ch/
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Trevano 131, 6900 Lugano, Switzerland   | Fax:  +41 (91) 610.82.82

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