有没有方法来判断两个COM接口引用是否指向同一个实例？ [英] Is there a way to tell whether two COM interface references point at the same instance?

问题描述

给定从不同来源获得的两个接口引用。是否有程序化方法来判断它们是否由同一个实例实现？

Given two interface references obtained from different sources. Is there a programmatic way to tell whether they're implemented by the same instance?

对接口引用的简单相等检查总是失败。

A simple equality check of the interface references always fails.

EDIT：原始问题的大部分原来是一个独立问题，现在已移至一个新问题。

Large parts of the original question, which turned out to be an independent problem have now been moved to a new question.

推荐答案

您可以查询IUnknown接口并比较这些指针。所有其他界面指针不保证每次都返回相同的值。

You could query for the IUnknown interface and compare these pointers. All other interface pointers are not guaranteed to return the same value each time.

从组件对象模型的规则：

对象标识。要求对特定对象实例的任何接口对任何特定接口IUnknown的任何调用QueryInterface都必须返回相同的物理指针值。这使得能够在任何两个接口上调用QueryInterface（IID_IUnknown，...），并比较结果以确定它们是否指向同一个对象实例（相同的COM对象标识）。

Object identity. It is required that any call to QueryInterface on any interface for a given object instance for the specific interface IUnknown must always return the same physical pointer value. This enables calling QueryInterface(IID_IUnknown, ...) on any two interfaces and comparing the results to determine whether they point to the same instance of an object (the same COM object identity).

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