什么是组件对象模型(COM)?是否依赖语言? [英] What is the Component Object Model (COM)? Is it language-dependent?

问题描述

我是COM的新手，我不知道它是什么或为什么存在.

I'm new to COM, and I don't know what it is or why it exists.

这是像OOP这样的编程方法吗?编程语言是否必须支持它?(带有一些特殊的关键字或其他内容)

Is this a programming methodology like OOP? Do programming languages have to support it? (with some special keywords or something)

当我问我的教授时，他说:

When I asked my professor about it, he said:

COM是执行OOP的二进制稳定方式.我们需要知道二进制布局(something..something ..)

COM is a binary-stable way to do OOP. We need to know binary-layout (something..something..)

我不知道这意味着什么.有人说它用于代码重用.OOP已经在这方面做得很好，那么为什么这个COM首先要发展呢?

I've no idea what it means. Some people say it is used for code reuse. OOP does a good job at that already, so then why did this COM evolve in the first place?

C ++和COM是什么?无论我在哪里看到COM，总是使用抽象的C ++示例对其进行描述.它仅适用于C ++吗?

What is it with C++ and COM? Wherever I see COM, it's is always described with abstract C++ examples. Is it only for C++?

有人可以给我看个案例或例子，以便我了解对COM的需求吗?学习此课程有什么要求，以便我可以编写自己的组件?

Can any one show me a case or exmaple so that I can understand the need for COM? What are the requirements for learning this, so I can write my own components?

推荐答案

COM的核心是一种提供独立于任何特定语言的数据传递协定的方式.事实证明，它与语言无关，因为有许多支持COM的语言(有C ++，C，.NET和Java实现)

COM at its core is a way of providing a data-passing contract which is independent of any specific language. It is provably not language dependent, as there are many languages which support COM (there are C++, C, .NET, and Java implementations)

在实践中，它对于两个不同的示例很有用:

In practice it is useful for a couple of different examples:

1. 不同语言之间的通信:由于COM与语言无关，因此可以使用COM在不同语言的组件之间传递数据.例如，您可以使用COM在C ++，Java和.NET代码之间进行对话.
2. 线程语义:COM允许您为特定组件定义线程语义，以确保无论在何处使用它，都可以在适当的线程上下文中创建它.
3. 常规组件化.

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