def __init__(self):
        vstruct.VStruct.__init__(self)
        self.Type = v_uint16()
        self.Size = v_uint16()
        self.MdlAddress = v_ptr32()
        self.Flags = v_uint32()
        self.AssociatedIrp = _unnamed_9027()
        self.ThreadListEntry = LIST_ENTRY()
        self.IoStatus = IO_STATUS_BLOCK()
        self.RequestorMode = v_uint8()
        self.PendingReturned = v_uint8()
        self.StackCount = v_uint8()
        self.CurrentLocation = v_uint8()
        self.Cancel = v_uint8()
        self.CancelIrql = v_uint8()
        self.ApcEnvironment = v_uint8()
        self.AllocationFlags = v_uint8()
        self.UserIosb = v_ptr32()
        self.UserEvent = v_ptr32()
        self.Overlay = _unnamed_9029()
        self.CancelRoutine = v_ptr32()
        self.UserBuffer = v_ptr32()
        self.Tail = _unnamed_9032()