[vtkusers] Translating small python code snippet to c++

[Prename Surname]

Hello. I am making a userinterface, and i need to capture keyboard events.
I have found this codesnippet written in python, but i cannot really
translate it into C++.
It is especially the lines

 def Keypress(obj, event):
 global mpr, mip, surface

that i dont know how to translate..If someone could just help me with those
2 lines i would be grateful.
Thank you all


Snippet :

 def Keypress(obj, event):
  global mpr, mip, surface
  key = obj.GetKeySym()
  if key == "1":
   if mpr:
    planeX.EnabledOff()
    planeY.EnabledOff()
    planeZ.EnabledOff()
    mpr = 0
   else:
    planeX.EnabledOn()
    planeY.EnabledOn()
    planeZ.EnabledOn()
    mpr = 1

  elif key == "2":
   if mip:
    volume.VisibilityOff()
    mip = 0
    renWin.Render()
   else:
    volume.VisibilityOn()
    mip = 1
    renWin.Render()

  elif key == "3":
   if surface:
    surfaceActor.VisibilityOff()
    surface = 0
    renWin.Render()
   else:
    surfaceActor.VisibilityOn()
    surface = 1
    renWin.Render()

 def ButtonEvent(obj, event):
  planeX.EnabledOff()
  planeY.EnabledOff()
  planeZ.EnabledOff()

 iren.AddObserver("KeyPressEvent", Keypress)
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