[Paraview-developers] addrofthis to give Python the address of a vtkObject

[Gerstenberger, Axel]

Dear developers,

When looking through the source code of Paraview (from which we learn all the time for our own code), I found that to get the address of a vtkObject for Python interaction you use code like this:

  // Set self to point to this
  char addrofthis[1024];
  sprintf(addrofthis, "%p", somepointer);
  char *aplus = addrofthis;
  if ((addrofthis[0] == '0') && ((addrofthis[1] == 'x') || addrofthis[1] == 'X'))
    {
    aplus += 2; //skip over "0x"
    }
  return std::string(aplus);

However, sometimes you use aplus for referencing the address (e.g. in vtkPythonAnnotationFilter), but sometimes you use directly addrofthis, but still execute the part to compute aplus. This happens for example in vtkPythonView.cxx, line 142 ff.

Since the first version is used a lot, is the second version in vtkPythonView.cxx a bug or does it serve a different purpose?

Also, this code snippet appears to be copied to quite a few places, but it is crucial for vtk Python interaction. Maybe a little static method in VTK could be created for that?

Thanks,
Axel


--
Dr. Axel Gerstenberger
Aero Methods and Design Systems Engineering (ET-DSE)

Rolls-Royce Deutschland Ltd & Co KG
Eschenweg 11, Dahlewitz, 15827 Blankenfelde-Mahlow, Germany

Tel: +49(0)33708-6-3101
E-Mail: axel.gerstenberger at rolls-royce.com

Absence pending: 14.06.2016

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