说明：  Essntial COM 介绍COM原理及使用的好书，可以深入理解com的实现机制，同事对加深理解c++知识也会起到很好的作用
(COM introduced Essntial COM Principle and the use of a good book, you can com-depth understanding of the realization of a mechanism to deepen their understanding of colleagues c++ Knowledge will play a good role)