讨论了组件对象模型的接口内存结构、基本构成，COM库调用机制以及安全性机制等问题。

The memory structure and basic composition of interface, calling mechanism of com database and security mechanism are described.

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接着具体讲述了组件对象模型中使用的两种设计模式：工厂方法模式和代理模式。

It describes two kinds of design patterns in COM in detail: Factory Method pattern and Proxy pattern, and tells how to realize the former.

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接着介绍作为OPC基础的组件对象模型COM原理，包含COM的特性、标准接口、以及COM组件的基本概念。

Then , COM which is the base of OPC is introduced including the attritudes of COM, standard interfaces and the concept of COM object.

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