此函数传递 IndexWriter,即起始目录以及候选文件要匹配的文件扩展名。
This function is passed the IndexWriter, which is the directory to start from and the file extension to match candidate files against.
这是目录树中用于解析用户帐户的起始点。
This is the starting point in the directory tree for resolving user accounts.
起始位表示该文件是否为目录(通常,起始位 表示该文件是否为特殊文件。
The initial bit indicates whether the file is a directory. (In general, the initial bit indicates whether a file is special.
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