Overview
Component based model
developed by Microsoft to introduce the language interoperability. To know
about COM we first know the scenario when COM concept comes in the .Net. We
know that in object orientation concept was re usability
of the code within the same application, but in any case if i want
to call the function of any class from other application of different language
then it was not possible.
What is COM?
COM is about clients
communicating with objects. COM provide the below facility in application level
Language Interoperability: If we look forward in object orientation concept then class
of one language cant not use in another application of other language.
Microsoft to introduce the language interoperability’s with component Object
model.
Location Transparency: We can deploy the application in anywhere of our machine and use it
from any other application of our machine. If any modification required in the
component we will only upgrade the COM component and corresponding changes automatically
reflect those application where this component has used.
Object Oriented
Programming = Polymorphism +
(Some) Late Binding + (Some) Encapsulation + Inheritance
Note: If you are
developing your client .NET application on the same machine, you don't need to
manually register it. However, if you are working entirely on a new machine,
you need to register this component with the regsvr32.exe utility. To register
a COM component you have to write the following code regsvr32 "Path where
COM DLL placed" Now any modification or up gradation done with the COM
component then just build the application and replace the component to the
register component path.
Language Interoperability: If we look forward in object orientation concept then class of one language cant not use in another application of other language. Microsoft to introduce the language interoperability’s with component Object model.
