Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

The concept of COM

Posted on 1998-10-15
2
231 Views
Last Modified: 2010-04-06
I still confuse with the concept of COM (Component Object Model), because it is similar with OLE concept.
Can any experts help me to make the concept clear to me?
0
Comment
Question by:stinger_60284
2 Comments
 
LVL 2

Accepted Solution

by:
Thaddy earned 0 total points
ID: 1343078
OLE, object linking /Embedding is part of the COM specification, although it's actually older technology.
COM is centered around the idea of 'interfaces'. An interface is an abstract 'contract' of how an object behaves when interacting with other objects. It says, 'Hey, if you ask me in a certain way, I Guarantee you that I will answer/behave in a certain, predictable way, always,period'.
The underlying implementation code to an interface can vary a great deal on the same interface, because the very same interface can be used for different applications with totally different needs.
The use of interfaces engourages the use of inheritance.
One noticable thing about interfaces, the centerpiece concept of COM, is that once you've chosen an interface, or defined one, you will NEVER EVER change it. which provides for a mechanism to be backwards compatibility. (see msword 7-msword 8).
There's far more to it than this, but remember this:
Think COM, think interface.
Recommended reading: Inside COM and Inside Ole (Microsoft press, I think)
0
 

Author Comment

by:stinger_60284
ID: 1343079
Thanks Thaddy's for the explanation.
I'll appreciate it so much.
:)
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question