blocks|key|1545386|text|COM在很大程度上透明地提供了本地(对象到对象)和远程(机器到机器，进程到进程)通信。只要稍加小心，您的代码就可以愉快地与托管在同一内存空间中的任何位置的对象一起跨internet工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1545387|虽然这种抽象有其自身的问题(不同情况下的动态特性非常不同)，而且二进制格式的使用挑战了互操作性，但它确实有效。并且工作得非常好(考虑Visual+Basic支持的所有业务线应用程序)。|1545388|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

COM provided both local (object to object) and remote (machine to machine, process to process) communications largely transparently. With a little care your code could happily work with objects hosted anywhere in the same memory space to across the internet.

While this abstraction had its problems (the dynamics of different cases were very different) and the use of a binary format challenged interoperability it did work. And work very well (consider all the line of business applications that Visual Basic enabled).

blocks|key|1545346|text|很难说一个产品是可用的最流行的操作系统的主干，如果它是应用程序，那么大多数都不是有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1545347|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It's hard to call a product which is the backbone of one of the most popular operating systems available and the majority if it's applications anything other than useful.

blocks|key|246049|text|实际上，它已经被广泛使用多年了。许多相互集成和交互的应用程序都依赖于COM技术。我想即使是.NET库也会将自己注册为COM。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|246050|至于整个混乱，我不会同意这一点。它相当复杂，但不是一团糟。当然，您需要很好地理解OO、接口、指针、低级编程以及造就优秀C%2B%2B程序员的大脑模型。|246051|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Actually, it has been in wide use since years. Many applications that integrate with each other and interact rely on COM technology. I suppose even the .NET libraries register themselves as COM.

As for the total mess, I wouldn't agree here. It's quite complex, but no mess. Naturally, you would need to have a good understanding of OO, interfaces, pointers, low level programming and that model of brain that makes a good C++ programmer.

blocks|key|245461|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|245462|让COM大放异彩的用例有哪些？|blockquote|245463|245464|245465|不同语言之间的互操作(例如C%2B%2B和Visual+Basic)|245466|不同进程之间的互操作(例如OLE，在Word文档中嵌入Excel电子表格)|245467|不同供应商之间的互操作(例如，如果您想编写一个插入到Windows资源管理器中的外壳扩展，您可以使用COM来实现，因为资源管理器为它将要调用的扩展声明了一个COM接口)。|245468|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|N|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|O|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|P|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|Q|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|R|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|S|7|@]|8|@]|9|$]]|$1|J|3|K|4|5|6|T|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|U|7|@]|8|@]|9|$]]]|M|$]]

<blockquote>
 What are the use cases that make COM shine?
</blockquote>

Interop between different languages (e.g. C++ and Visual Basic)

Interop between different processes (e.g. OLE, embedding an Excel spreadsheet in a Word document)

Interop between different vendors (e.g. if you want to write a shell extension which plugs-in to Windows Explorer, you do that using COM because Explorer declares a COM interface for extensions which it's willling to invoke).

blocks|key|246024|text|在许多项目中，COM已经被.NET取代，但是COM仍然可以用底层的C%2B%2B编写，而且人们只使用COM来编写高性能的应用程序，其中每个cpu周期都很重要，可能是directX，游戏应用，硬件接口等等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|246025|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

COM has been replaced by .NET in many projects, but COM still can be written in lower level MFC/ATL C++, and people only use COM for writing high performance application where every cpu cycle counts, probably directX, game apps, hardware interfacing etc.

blocks|key|1545393|text|COM在GIS应用程序中仍有广泛的应用。它是一些应用程序的主干，例如ArcMap+(ESRI)及其巨大的空间对象编程应用程序接口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1545394|正如每个人所说，它是复杂的，但一旦你掌握了一些关键概念，就更容易为它开发/使用它开发。|1545395|.NET支持COM对象。|1545396|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

COM is still widely used in GIS applications. It is the backbone of some applications, such as ArcMap (ESRI) and their enormous programming API for Spatial Objects.

It is complex, as everyone said, but once you grasp some key concepts it easier to develop for/with it.

.NET has support for COM objects.

blocks|key|1364652|text|虽然COM不是为它而设计的(当然)，但它已经偶然成为本机代码(例如C%2B%2B)与.NET接口的最佳方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1364653|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

While not designed for it (of course) COM has incidently become the best way to interface native code (e.g. C++) with .NET.

blocks|key|1545429|text|COM或OLE这个名字总是让我感到厌烦。因为我没有把它看作一个对象技术--+COM对象不能继承！我以为这是一种包装技术...但是M$使用了名称词“对象”来使它看起来比它实际上更多。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1545430|同时可用的其他技术，如NeXT的可移植分布式对象，使它看起来很原始。|1545431|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The name COM or indeed OLE always grated with me. As I didn't view it as an Object technology - COM Objects couldn't inherit! I thought it was a packaging technology.... but M$ used the name word "Object" to make it seem more than it was. 

Other technologies which were available at the same time such as NeXT's Portable Distributed Objects made it seem primitive.

blocks|key|1364748|text|大多数问题都是因为开发人员并不真正了解COM。但COM是如此难以理解，以至于微软不得不重新设计另一个类似的平台，即.Net。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1364749|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Most of the problem is because of the developer who doesn't really understand the COM.
But COM is so hard to understand that Microsoft have to redesign another similar platform, that is, .Net.

My experience with it has been that it's a total mess, and causes problems that are difficult to diagnose and fix for non-black-belt Windows developers.

What are the use cases that make COM shine?

Is/was Microsoft's COM considered a good/useful technology?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我的经验是，它完全是一团糟，并且导致了一些问题，对于非黑带Windows开发人员来说很难诊断和修复。让COM大放异彩的用例有哪些？

问微软的COM被认为是一种好的/有用的技术吗？
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