st_atime -- the last access time
st_atime——最后的访问时间
The two nulls indicate that we do not want to change the last access time or creation time for this file.
这两个null指出，我们不想改变这一文件的最后访问时间或者创建时间。
The atime is the last access time of a file, and each time a file is accessed, the underlying file system must record this timestamp.
atime是最近访问文件的时间，每当访问文件时，底层文件系统必须记录这个时间戳。
If you check the basic attributes again, in the same way we did earlier, you should see that the last modified time has been altered but the creation time and last access time have remained the same.
如果以前面相同的方式再次检查基本属性，您会发现最后修改时间已被修改，但是创建时间和最后访问时间还保持原样。
Indicates the last access time for this storage stream or byte array.
指示此存储、流或字节数组的上次访问时间。
Specifies the last access time for this storage, stream, or byte array.
指定此存储、流或字节数组的上次访问时间。
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.
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.
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。
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