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ATL COM Tutorial

• Building Server And Client
• Connection Points
• Calendar ActiveX Control Using ATL
• Multiple Controls
• Reusability In COM
• Reusability In COM-II (Aggregation)

What is COM? Quite often programmers develop the ability to write COM components but are still hazy about what COM really is. So let’s make a one-line definition of COM. COM is a specification and a set of services that permit us to create applications that are language-independent, modular, object-oriented, distributed, customizable, and upgradable. Let us now take apart this definition word by word.More Details…..

DLL And COM The whole idea of computing today is to put together applications rapidly from reusable maintainable code (preferably written by someone else). Object-oriented languages help developers to write reusable, maintainable code. The benefits of object-oriented techniques are there for all to see. However, an object-oriented language is not sufficient for widespread reuse. This is because developers throughout the world are programming in different languages. Developing all applications through a single programming language is a dream that is never going to come true. There are several reasons for this. More Details….

COM Example Using MFC In this article, we would explore an in-process COM component in the form of a DLL that support IMyMath interface. We would then write a real COM client that would use this component.         In programming, there are often many ways to solve a problem. MFC and VC++ programming is not an exception to this. The way we code our component in this example is just one way to do it. We want you to learn the interaction between code that wizards provide and the code that you need to write in a simplest possible manner. We hope our approach enables you to understand a more complex programming you might encounter in other places. More Details….

Standard Interface We often create shortcuts for program/documents on Windows desktop. This is a two step process. In step 1 we right click on the desktop and select ‘Create Shortcut’ from the menu that pops up. In step 2 we select the file for which the short is to be created. At times we may want to do this procedure programmatically. Here is the program which, shows how this can be achieved. More Details…..