[vtkusers] crash with MarchingSquares.

[Oliver Kania]

Hi all !

The following C++ code, which workd with C# wrappers and VTK 5.02
produces a crash with the newest CVS version :

vtkTIFFReader* l_imagereader = vtkTIFFReader::New();
  l_imagereader->SetFileName("D:\\data\\imgs\\2008-02-18 16'12.tif");
  l_imagereader->Update();
  double* l_range;
  l_range = l_imagereader->GetOutput()->GetScalarRange();
  vtkMarchingSquares* isoLines = vtkMarchingSquares::New();
  isoLines->SetInput(l_imagereader->GetOutput());
  isoLines->GenerateValues(10,l_range[0] ,l_range[1]);
  int* dims;
  dims = l_imagereader->GetOutput()->GetDimensions();
  isoLines->SetImageRange(0, dims[0], 0, dims[1], 0, 0);
  isoLines->Update();
  isoLines->Update(); // Ooops --- Crash !!

The crash happens in the update method.
Visual studio shows the following diagnostic message :
HEAP CORRUPTION DETECTED ...

Any help / ideas would be greatly appreciated.

 regards,
Oliver
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