×
The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.
Thanks to all for taking the time to enlighten me. I will surely take the time to better understand them.
Warmest Regards,
Richard Reeve
________________________________
From: Scott Klement <midrange-l@xxxxxxxxxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Sent: Monday, October 15, 2012 5:04 PM
Subject: Re: Callback
Hi Richard,
Callbacks are extremely commonplace in computer programming. I'm kinda
shocked at seeing not one but multiple people in this thread saying that
they don't even know what a callback is.
Exit programs are an example of a callback. You give the system the name
of a program, and it calls it at a particular time.
Triggers are another.
The %HANDLER routines used by XML-SAX or XML-INTO are callbacks.
APIs like Qp0lProcessSubtree(), QaneSava, QaneRsta use callbacks.
I use callbacks in RPG, C, Java, JavaScript. In fact, in JavaScript
they are utterly ubiquitous, you can't sneeze without using a callback
in JavaScript.
You should definitely take the time to learn about them.
On 10/15/2012 3:50 PM, Richard Reeve wrote:
Has anyone ever heard of a callback as it is related to the IBM i? I was asked to explain a callback during an interview and I'd never even heard of it. Can any of you explain to me what a callback is and how it is used? I tried google but didn't get a good explanation.
Thanks.
Warmest Regards,
Richard Reeve
midrange.com
