Interfaces??

[saradhi74]

Hi I am new to COM programming...

I want to know what is Interface in COM and why do they use them? what is main purpose of that interface????


If I have to write COM component do I need to create interfaces?

if you have any good reference for sites pls. let me know


Thanking you in advance

Pardha

[crptcblade]

In simple terms, an interface is a contract. If you implement an interface, you must provide access to all the public functions, subs and properties that are part of that interface.

Example :

'IDog interface
 
Public Sub Bark()
End Sub

'Collie class
 
Implements IDog
 
Private Sub IDog_Bark()
    MsgBox "Woof"
End Sub

So now, any class that implements IDog is guarunteed to have a method called Bark, because its part of the interface.

You don't need to use them. Like everything else, they have they're time and place.

[biswajitdas]

Interface are the contract between com client and com server.

interface give the facility to do the com instances in com.


interfcae can be implemnt by the key word


implement


Biswajit das