[vtkusers] how to access to vertices,faces... with vtk

[Syn3DDM]

I am a new user of vtk. I am trying to access vertices,faces in a charged
mesh.
i tried this code but it doesn't work:

vtkOBJReader *OBJreader=vtkOBJReader::New();

OBJreader->SetFileName("F:\\Y6689_VENUS.obj");

vtkPolyData *mydata=vtkPolyData::New();

mydata=OBJreader->GetOutput();

vtkPoints *mypoints=mydata->GetPoints();//this instruction does'nt work
                                                           //it causes a
problem when I execute the program!

this code doesn't work. I have even tried with vtkPLYReader but also it
doesn't work!
If someone has a solution please help me.
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