Rules for good coding style I started this with the idea of writing a blog about “Rules for good RPG coding style”, I was discussing this with an old friend and colleague yesterday. He moved away from the AS400 machine, just as it was being replaced with the old iSeries machine. He’s now spent nearly

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Upgraded our IBM i systems to IBM i V7.3 yesterday and so far everything is running nicely except for this one weird little glitch: some of the existing DDS WINDOW SCREENS are bombing with CPF4169 The device file does not contain an entry for screen size when they seem to have been quietly working for years,

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While I was writing that previous blog about handling wide fat screens I stumbled across another useful API (QSNRTVMOD) for retrieving the current screen mode that we are displaying. This means we could find our screen width programmatically. Why isnt that a word? I’m not too sure why anyone would want to do this but…

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If there was a quick and easy solution to “how to quickly become a productive RPG IV and ILE programmer” then all of us old AS400, iSeries and IBM I developers would have gobbled up that solution in double quick time. But Wait. There might just be Ne. Drinking Tea. If you have read any

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Modernizing RPG Programs – Learn the RPG History first I had email email from an old work colleague this morning. He was a windows programmer, with limited exposure to RPG, but works in a company that is driven by a huge, old, complex RPG3 application that has changed little over the last decade. He is

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Write Clean RPG Code This morning I was revisiting a program that I wrote last year and looking at my code thinking “Why the hell did I write it like that? #Ugly”. RPG code evolves and lots of code evolution starts in one direction and then branches off, drunkenly in another direction. This means that

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RPG CODE EXAMPLE – “Write to joblog” in Free Format RPGLE Write to the IBM i joblog is a neat way of recording details of any running jobs information. This example lets us send messages from inside a running RPG program. It’s simple using one of IBM’s API’s – QMHSNDPM – and this source code

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RPG CODE EXAMPLE – “Write to joblog” in RPG with Qp0zLprintf Write to joblog lets us send messages from inside a running RPG program. It’s simple using one of IBM’s API’s – Qp0zLprintf Qp0zLprintf() — Print Formatted Job Log DataThe Qp0zLprintf () function prints user data specified by format-string as an information message type to the

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Indicators Suck! So, lets look at two simple alternatives to make your RPG code more readable and easier to understand and modify. (1) RPG Named Indicators When is an RPG indicator more than just a number? We can use a named data structure to overlay over the top of all the indicators used in the program.

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I was talking about RPG OA today. If you’re an IBM i techie, then you will know about OA already. You probably understand its power and potential in our IBM-i world. If you’re a bit more old school, you’ve been churning out column-based code for years, or you are living under a rock in a

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Decode JSON webservice reply data (already stored in IFS) using YAJL This reads the JSON from the IFS – decodes it using Y.A.J.L and reports on time taken to perform decode. Writing an RPG program to read JSON using YAJL is actually pretty straightforward — I hope this code example helps! In this case the

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Lets look at an example RPG program talking to a webservice As an RPG Programmer you are probably writing a ton of code to talk to remote webservices out there in internet land. If you are just learning webservice programming, it can seem like a daunting exercise. So, to help you with your first steps

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