VC中没有像VB中那样的目录树控件，这个类弥补了这一缺憾-VC not like VB kind of tree controls, to make up for this type of this defect

在类VC的界面实现中加入目录树,功能很全面,内附开发过程以及主要函数讲解.,VC in the interface type to include the directory tree, function very comprehensive, containing the main function of the development process, as well as on.