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Category: Learning

Guest Post: Learning Xojo

Published January 12, 2015 by Xojo

Bob Keeney has been an active member of the Xojo community since 2001. BKeeney Software has offered Xojo consulting work for 15 years with happy clients all around the world. Bob blogs regularly on Xojo and developer topics at www.bkeeneybriefs.com.

I think that Xojo is an amazing product. Clients love the simplicity and power of Xojo which is not found in many software development products. Part of what makes it a great product to work with is the wide array of options to learn more about the language- whether it’s for someone who’s new to programming trying to get an introduction to the language or for an experienced programmer trying to do a deep dive into the framework and what Xojo is capable of.

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Oh, Say Can You C?

Published December 18, 2014 by Norman Palardy

There is a “bug” here, can you spot it?

dim s as string = "abc" + chrb(0) + "def"
dim c as cstring = s
if s = c then
  msgbox "Yay our software works as we expected!!!!"
else
  msgbox "BOOOOOO!!!!"
end if
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Guest Post: Managing Database Schema Control Over Multiple Versions

Published December 6, 2014 by Xojo

Wayne Golding has been a Xojo developer since 2005. He operates two IT companies, a Network/Systems services co & DRNine11 an offsite backup & DR co. Though he primarily uses Xojo for internal management systems and utilities, Wayne’s hobby is robotics where he uses Xojo to communicate with Arduino devices.

When distributing applications with a database component you will undoubtedly upgrade your database schema as your application matures. So how do you manage the schema within your application?

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Shadowing: You can’t always get what you want (or expect)

Published November 19, 2014 by Norman Palardy

Shadowing is when a subclass defines a constant, property or enumeration (almost anything that is not an event or a method) that has the same name as a constant, property or enumeration (but not an event or a method) in the superclass. Generally the best rule is avoid using the same names for constants, properties and enumerations that the superclass has already used.

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It’s 10 o’clock. Do you know where your time zone is ?

Published November 14, 2014 by Norman Palardy

If you’ve worked with times and dates you know how much fun they can be especially when you deal with different time zones, differing Daylight savings time rules, if they observe DST and all the other intricacies tracking dates and times bring up.

And very often you need to save data to a database. So how do you store the data in your database so you can properly deal with it? And does your chosen database make that easy?

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Can You Catch?

Published November 5, 2014 by Norman Palardy

This came up recently on the forums and I thought it good to share. Do you see what is wrong with the following code?

Function foo() As FolderItem
  try
    beep
  catch NilObjectException
    return nil
  end try
End Function
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