[vtkusers] code in c++

[marisa aurelio]

Hi vtk users:
I have this code in TCL. Can anyone explain me how to convert to c++??
Thanks.
Marisa

--------
vtkProgrammableSource pointSource
    pointSource SetExecuteMethod readPoints

proc readPoints {} {
global VTK_DATA_ROOT
    set output [pointSource GetPolyDataOutput]
    vtkPoints points
    $output SetPoints points

   set file [open "$VTK_DATA_ROOT/Data/cactus.3337.pts" r]
   while { [gets $file line] != -1 } {
      scan $line "%s" firstToken
      if { $firstToken == "p" } {
         scan $line "%s %f %f %f" firstToken x y z
         points InsertNextPoint $x $y $z
      }
   }
   points Delete; #okay, reference counting
}
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