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This Week @ the MC Press Bookstore

February 4, 2009 | Vol 8 Issue 3

 

In This Issue:

Sponsor - T.L. Ashford & Associates
 
T.L. Ashford is “The Labeling Answer”® for the System i.
Ashford's Barcode400 has been the dependable choice for the industry since 1983. With Barcode400's newly enhanced Graphic Designer no “green screen” interaction is needed for label design. New features include: AFP/HP-compatible printing, easy-to-use graphics import tool, test print to desktop printer, simple font download tool, updated drivers and format listing reports. Even compliance labeling is made easy with design templates. Call 800-541-4893 to order your FREE Trial Software or visit us at  T.L. Ashford & Associates.

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Feature Article - Programming
 
Practical RPG: Using Callbacks to Reduce Complexity

You may have heard of callbacks or even seen some abstract examples, but this article shows you how to use them to be more productive.

joe_pluta.jpgBy Joe Pluta

The concept of a callback procedure is unusual for us RPG programmers, to say the least--especially for those of us who have come from the monolithic programming architectures of the early midranges and embraced the hipper, cooler concept of called programs and the brave new world of procedures. While it's easy to get my head around a procedure by thinking of it as a subroutine with parameters (thus seeing the immediate benefit of that concept), the notion of a callback is a bit more complex, mainly because the benefit of the approach is not immediately obvious. This article offers a practical example of how to use callbacks to make development much easier.


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Feature Article - Programming
 
Determining and Providing the Appropriate CCSID for an API, External System, or Language

What do you do when you need to convert back and forth between EBCDIC and ASCII?

tom_snyder.jpgBy Tom Snyder

When dealing with systems other than the IBM i or communicating with languages other than RPG, you will need to use a common language to communicate. The native language of RPG is EBCDIC, and most non-IBM systems and languages work with the ASCII code set, so you will need to convert the characters going out of and coming into RPG. This is where the Coded Character Set Identifier (CCSID) value comes into play when you see it specified as a parameter of an API.


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