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Beginning ASP Components, page 6

Author: Richard Anderson
Level of Difficulty: Beginner
Languages covered: ASP Components, Network Application Architecture, Interfaces and Implementation.
Pre-required reading: None

Contents

• Starting Out With Components
• Interfaces and Implementation
• Using Components from ASP
• Different Kinds of Components
• Network Application Architecture
• Building Our First Component
• Summary

Summary

In this chapter we've highlighted typical software development problems and shown how componentization can go a long way to making our applications easier to develop and maintain. We've taken the time to understand some of the concepts behind componentization, including some analogies-such as the telephone operator, the hi-fi separates, and the car component. We understood the difference between interface and implementation, and noted that we can exchange one component in a system with another, provided the new component offers the same interfaces as the old one.

We've shown how the Component Object Model (COM) provides a specification and infrastructure that allows us to develop COM objects and use them in any language that is COM enabled. COM components can use, and be used by, any other COM-enabled language or environment-which makes COM extremely powerful. We've also explained how interface-based programming is central to COM.

We looked at how components are identified-via a GUID or ProgID-and that COM uses the registry to store and access this information. We suggested an informal categorization of components, in order to try to understand more about where componentization can be applicable. We also took a first look at 2-tier and 3-tier architecture. Finally, we saw how to implement a COM component using the WSC, and used within an ASP page.

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This article is the first chapter of the book 'Beginning ASP Components' from Wrox Press.

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Further Reading:

1. Microsoft Transaction Server By Richard Grimes, introduces Microsoft Transaction Server
2. What COM is all about By Richard Grimes, an introductory article to COM, covering all basics including OLE, Activex and DLL's.
3. String Binding Moniker By Frank Rem, shows how a SB Moniker resolves a connection with a DCE RP server running on Linux using a VB client.
4. Inside COM Monikers By Davide Marcato, on COMdeveloper.com. monikers are still one of the most clever but at the same time most misunderstood idioms in the COM universe. Davide explains them.

Author Bio:

Author: Richard Anderson

Richard has been developing since around the age of eight.

Richard has recently completed co-authoring Professional XML and ASP ProgRef 3.0. Other books co-authored by Richard include Beginning ASP components and Pro ASP 3.0.

Go to Richards pages in Author Central.

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