def __init__(self):
        vstruct.VStruct.__init__(self)
        self.pNextAlloc = v_ptr32()
        self._pad0010 = v_bytes(size=12)
        self.pUserAllocation = v_ptr32()
        self.pVirtualBlock = v_ptr32()
        self.nVirtualBlockSize = v_uint32()
        self.nVirtualAccessSize = v_uint32()
        self.nUserRequestedSize = v_uint32()
        self.nUserActualSize = v_uint32()
        self.UserValue = v_ptr32()
        self.UserFlags = v_uint32()
        self.StackTrace = v_ptr32()
        self.AdjacencyEntry = LIST_ENTRY()
        self.pVirtualRegion = v_ptr32()