COM Application

[zubairkhan]

I completed COM three part course of Mr. Karle Moore but i still need to know that what are its applications. and where it needs to apply.
If any one of u may guide me i will go through in COM.

Zubair Khan

[007shahid]

COM is used to share properties, functions etc... by many forms & applications.
Eg: ActiveX Data Objects COM, which is used by many applications to do i/o with databases

[hellswraith]

Are you asking what COM is used for? If so, it can be used for many things. Think about creating a component that you can use over and over again, just by adding a reference in the apps you use it with. The best example of what you can use COM for is to look at the references that you can apply to your app. All those are COM components. (go to Project->References in the VB IDE).

Another reason, is if your creating an n-tier application. You would want to put components on the middle tier that handle business logic (sounds like it is comming out of a book, but that is what they are mainly used for). The reason why becomes evident when you need to make a change to your business logic. Instead of updating every client app (which in a big corporation could be in the hundreds), you just change your COM component on the middle tier and all applications can now use the updated com component, without even going to each computer. Talk about a life saver. So basically, in a n-tier app, you will only want basic validation and GUI stuff on the client, and the rest of the program distributed on the middle tier using com components.

That is my take on the subject anyway....