When we handle file-system directories, we have to call apr_dir_open() at first. By apr_dir_open(), we have an apr_dir_t object. All we can do with apr_dir_t is to scan the directory.
第六节 目录处理(file-system directory handling)
本文介绍如何使用apr_dir_open()函数打开文件系统目录,并通过返回的apr_dir_t对象进行目录扫描。

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