COM Design and Application

代码说明：

COM 组件设计与应用--用ATL写第一个组件.除了所有 COM 组件必须的 IUnknown 接口外，再实现一个自己定义的接口 IFun，它有两个函数： Add()完成两个数值的加法，Cat()完成两个字符串的连接。-COM Design and Application-- ATL wrote an article components. In addition to all the necessary COM interface pointers, then realize their own definition of a IFun interface, which has two functions : Add () completed the two numerical addition, the Cat () completed the string connecting two .