def __init__(self):
        vstruct.VStruct.__init__(self)
        self.MajorFunction = v_uint8()
        self.MinorFunction = v_uint8()
        self.Flags = v_uint8()
        self.Control = v_uint8()
        self.Parameters = _unnamed_9066()
        self.DeviceObject = v_ptr32()
        self.FileObject = v_ptr32()
        self.CompletionRoutine = v_ptr32()
        self.Context = v_ptr32()