说明：  C类CFileFind执行本地文件查找，是CGopherFileFind和CFtpFileFind的基类；后两类用于Internet文件查找。CFileFind包括的成员函数有开始查找、定位文件、返回标题名或路径。对于Internet查找来说，GetFileURL返回文件的URL。
(C CFileFind implement local file search, is CGopherFileFind and CFtpFileFind base class Two kinds of used for Internet files after the search. CFileFind including member functions have to find out, positioning document, return to title name or path. For Internet search for, GetFileURL return to file URL.)