说明：  说到COM，相信在Windows平台上有过开发经验的朋友一定接触过，它是Windows操作系统的基本软件模型，从93年建立以来，为Windows平台的推广和发展做出了不可磨灭的贡献，而且其自身还在不断发展。但是要真正开发COM组件并不是很轻松，在Visual C++中，我们既可以使用MFC也可以使用ATL。MFC完全面向Windows应用，它用C++的封装技术建立了一套适合于开发Windows应用的C++类库，虽然在后期的版本中MFC提供了大量的COM支持，但是从基本的设计结构上讲，MFC不适合于开发专业的COM组件，它适合于在Windows应用的基础上提供相应的COM支持
(said, I believe that the Windows platform had experience in the development of certain contact with friends, it is the basic Windows operating system software model, from the establishment of 93 for the Windows platform, and promote the development of an indelible contribution, but also its own development. But to really develop COM is not very easy in Visual C, we can use MFC can also use ATL. MFC entirely oriented Windows applications, it is using the C Packaging Technology for the establishment of a set of Windows applications in the development of the C library, although in the latter part of MFC version provides a large number of COM support, but from the basic structure of the design sense, MFC is not suitable for the professional development of COM, it suited to the Windows applicat)