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Clarification, fixed typos, some capitalization and grammar.

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Author:vwheeler
Date:2014-03-21T21:40:46.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@1277 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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vwheeler
2014-03-21 21:42:10 +00:00
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documentation/current/platform-specifics/microsoft-windows/com/eiffelcom-wizard/com-and-eiffel/com-concepts.wiki
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[[Property:title|Generalities]]
[[Property:title|Fundamental Concepts]]
[[Property:link_title|COM Concepts]]
[[Property:weight|1]]
[[Property:uuid|9cb19fc1-3d26-5752-6232-ea23f2668c32]]
COM is a binary standard that describes how a component can communicate with the outside world. The component communicates through well-defined interfaces. Each interface is a specification of a group of properties and methods. Importantly, the interface does not contain the implementation of the properties and methods, only their specifications (signatures). The actual implementation lies in the [[Coclass|'''coclass''']]. There can be different implementations of a same interface in different coclasses. Finally, each coclass can be instantiated using a class object or class factory. These three notions will be discussed further in the forthcoming paragraphs.
This page defines some concepts that are fundamental to the entire technology of COM.
<!--break-->
==The COM Standard==
COM is a standard that describes how a binary component can communicate with the outside world.
==Interfaces==
The component communicates through well-defined interfaces. Each interface is a specification of a group of properties and methods. It is important that the interface does not contain the implementation of the properties and methods, only their specifications (signatures).
==Coclasses==
The actual implementation lies in the [[Coclass|'''coclass''']]. There can be different implementations of the same interface in different coclasses.
==Class Objects or Class Factories==
Finally, each coclass can be instantiated using a class object or class factory.
These three notions will be discussed further in the forthcoming paragraphs.
{{seealso|<br/>
[[EiffelCOM Library| EiffelCOM library]] <br/>
[[EiffelCOM: Introduction| Introduction]] <br/>
[[COM Interfaces| COM Interfaces]] <br/>
[[Coclass| Coclasses]] <br/>
[[EiffelCOM: Introduction|Introduction]] <br/>
[[COM Interfaces|COM Interfaces]] <br/>
[[Coclass|Coclasses]] <br/>
[[The Component Location| Component Location]] <br/>
[[Access Type| Access Type]] <br/>
[[Deeper into COM| Deeper into COM]] }}
[[Access Type|Access Type]] <br/>
[[Deeper into COM|Deeper into COM]] }}