需要澄清COM规范 [英] COM specifications need to be clarified

问题描述

问候，



我需要了解一些COM规范和术语。我在这里读了一篇关于COM的好文章， COM简介 - 它是什么以及如何使用它，然而，我仍然不理解的东西很少，我希望有人可以帮助我。首先文章指出

Greetings,

I need to know about some COM specifications and terminologies. I read a good article here about COM, Introduction to COM - What It Is and How to Use It, however, there are few things I still do not understand and I hope that someone could help me in that. Firstly the article states that

引用：

接口不允许多重继承

另一方面，文章中提到了一个方法IUnknown接口名为

On the other hand, the article mentioned a method on the IUnknown interface called

Quote：

QueryInterface（）

QueryInterface()

如果对象的类实现更多，它可用于从COM对象请求指针比一个界面。所以我很困惑是从多个接口继承（即类：interface1，interface2等等）是允许/不允许的？!!!我们还将接口类型的指针传递给CoCreateInstance（）方法以及类名作为多态的形式，因为可能有多个类在其中实现相同的接口？这是前两个问题



我尝试过：



在论坛上阅读有关COM的文章，了解什么是COM对象

which can be used to request a pointer from a COM object if the object's class implements more than one interface. So I am confused is inheriting from multiple interfaces (i.e., class : interface1, interface2, etc...) is allowed/not allowed?!!!. Also do we pass a pointer of interface type to the CoCreateInstance() method along with the class name as a form of polymorphism as there may be multiple classes each implement the same interface in its on way?. Those are the first two questions

What I have tried:

Read an article about COM on the forum to understand what are COM objects

推荐答案

COM 界面不是 C ++ interface（ COM 'class'不是 C ++ 'class'如文章所述）。看一下 COM对象和接口（COM） [ ^ ]。 COM 类可能会暴露多个接口，但不会隐含任何接口多重继承。

COM interface is not C++ interface (COM 'class' is not C++ 'class' as stated in the article). Have a look at COM Objects and Interfaces (COM)[^]. A COM class may expose multiple interfaces, but no interface multiple inheritance is implied in that.

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