By Shelley Powers
Microsoft's lively Server Pages (ASP) know-how has turn into wildly well liked by internet builders. even if, the suggestions for constructing customized ASP elements, let alone the inevitable snags and pitfalls, aren't good documented. what is extra, the winning ASP part developer has to be a jack-of-all-trades, with a few wisdom of COM and COM+, threading types, and the ASP item version, in addition to a mastery of 1 or extra language instruments and improvement environments.That's the place Developing ASP Components, second variation, is available in. Its first part explores the themes all people must understand to boost potent ASP components:
- Configuring the ASP improvement environment.
- ASP elements and the part item version (COM).
- ASP elements and threading models.
- ASP elements and part providers, which supply a number of companies to ASP components.
- The gadgets, homes, equipment, and occasions on hand within the ASP item model.
ASP elements are language self sustaining, and builders more and more are likely to use greater than a unmarried language device. therefore the rest of the publication specializes in ASP part improvement utilizing one among significant improvement tools--Microsoft visible easy and Microsoft visible C++ (with the ActiveX Template Library)--along with a couple of different languages, akin to Perl and Delphi. every one part specializes in the problems that hindrance the ASP part developer utilizing that exact improvement surroundings. those concerns include:
- getting access to ASP's intrinsic objects.
- having access to facts utilizing ADO.
- developing n-tier net functions with VB.
- dealing with patience utilizing MFC in addition to visible C++/ATL.
It's this robust concentrate on significant improvement environments, in addition to a radical grounding in crucial ASP subject matters, that makesDeveloping ASP Components the definitive source for the ASP program and part developer.
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Additional resources for Developing ASP components
Chapter 4, ASP Components and Threads, goes into more depth on threads and apartments. Now that you have a basic idea of what ASP components are, the next section discusses why you would use ASP components instead of creating the ASP application using scripting exclusively. Page 12 Why Use ASP Components? In the beginning of the chapter, I started listing some reasons to use ASP components instead of scripting. In this section I want to discuss this in a little more detail. From a perspective of usage, an ASP component can be used in place of scripting where scripting is just not workable or efficient.
However, in a larger application that makes multiple changes of this type, having the application itself maintain consistency between the data updates of all the components can become overwhelming at some point. The best solution of all is to have some other process manage the transaction state of the components and test to see whether each component has succeeded in its operation or whether one of the components has failed. If any one of the components fail, then the changes made by all of the components are rolled back.
You have to become familiar with one or more development tools, such as Visual Basic, Visual C++, or Visual J++ (this book covers all three), and of course you also have to become familiar with the tool's underlying language. However, you can't stop there. ASP components are nothing more than specific types of COM-based components; that is, they're COM components designed to interface with Active Server Pages and, most commonly, with Microsoft's Internet Information Server. Consequently, you need to develop a certain level of familiarity with COM, the Component Object Model that underlies much of Microsoft's technology.