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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 .