def __init__(self):
        vstruct.VStruct.__init__(self)
        self.WaitQueueEntry = KDEVICE_QUEUE_ENTRY()
        self.DeviceRoutine = v_ptr32()
        self.DeviceContext = v_ptr32()
        self.NumberOfMapRegisters = v_uint32()
        self.DeviceObject = v_ptr32()
        self.CurrentIrp = v_ptr32()
        self.BufferChainingDpc = v_ptr32()