kailash
Answered On : Oct 7th, 2005
COM component object model
a component which can attached with any component and create a new component (aggregation) each component must have a 128 bit id that must be register on ther registry of windows
Dcom distributed component model
a component which can be used on network
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harish
Answered On : Oct 20th, 2005
COM is a Specification defined by microsoft in order enhance the productibility of one application in to other.COM is a FrameWork which when implemented both the application can talk each other.COM is set of rules and it is language independent. COM talk about Language interability. and reusablility.
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Aidan
Answered On : Mar 2nd, 2006
"Productibility", "Language interability and reusability"? Can you clarify what that means? Thanks.
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Deepu Abraham K
Answered On : Jun 13th, 2007
COM
1/ Component Object Model (COM) is a standard introduced by Microsoft.
2/ COM is a language-neutral way of implementing objects.
3/ It can be used in different environments, even other than where it was created
4/ It can be used across the machine boundaries
5/ A good COM component (well written) allow re-usability. The component implementers have to just know about its interface.
6/ It has been implemented on several platforms, COM is primarily used with Microsoft Windows.
DCOM
1/ Nothing but Distributed COM
2/ This will use RPC mechanism for communication
3/ DCOM had to solve the problems of
- serializing and deserializing the arguments and return values of method calls "over the wire".
- ensuring that references held by clients of interfaces are released when, for example, the client process crashed, or the network connection was lost.
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Chaitanya Sagar
Answered On : Jul 19th, 2007
COM( component object model) is a specification/ guide line document for creating the reusable components.
By Com we can achive
- Language Independent (by implementing Dual interfaces IDispatch for Nonpointer based languages and VTable for Pointer based languages)
- Location transparency ( By guid and clsids stored in windows registry we can have location transparency which cannot be done using dlls.
- Immutable:Old clients are not affected if we change the old component by new one, this cannot be done in case of dlls which is also known as dll hell.
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COM = Component Object Model.
DCOM = Distributed Component Object Model
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