有些属性由系统分配，如唯一 ID、所有者、上次更改该服务实体的时间。

Some properties are assigned by the system, such as the unique id, the owner, and the last time the service entity was changed.

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当对正在监视的目录中的文件或目录的大小、系统属性、上次写入时间、上次访问时间或安全权限进行更改时，调用。

Is called when changes are made to the size, system attributes, last write time, last access time, or security permissions of a file or directory in the directory being monitored.

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