CFileFind的扩展类CFileFindExt。加强了CFileFind类的功能，直接做成类CFileFind的继承类，非递归化时（为加快搜索速度，减少开销）将先深遍历改为层次遍历，用户根据需要可增加返回所有子目录名函数以及其它多参数处理函数。-CFileFind the expansion of category CFileFindExt. Strengthened CFileFind functions directly into the category of succession CFileFind category of non-recursive pm (To speed up the search for speed, to reduce overhead), will be replaced by the level of deep traversal Traversal, users need to increase the return of all sub- directory name, as well as other multi-parameter function handler.