On US tax day 2010, OpenWrt’s “qt4” feed got support for MySQL and SQLite. And there was much rejoicing among Qt developers. A big thanks to Mirko Vogt for porting the build system to OpenWrt and letting me help out with the SQL stuff.

For a while, I haven’t been able to get scp to work between Linux and Mac OS X. This only happened when I used the scp command on my Linux box, with Mac OS X acting as the ssh server. Here’s the symptom: On Linux: $ scp user@192.168.1.5:~/Documents/Some/File.txt /tmp/. Password: $ It disconnected me after […]

Today’s reminder comes from the “magic number” department, where we remind you to never hard-code a magic number in your software. For example, the value for ETIMEDOUT on Linux can vary depending on your C library. glibc, for example, defines it as 110, but uClibc defines it as 145. This tends to matter when you […]

M&Ms are yummy. At work we have ginormous bags of M&Ms to snack on. One day I reached into the bag and pulled out a handful (about 8 M&Ms). I happily munched until there were 4 left. Lo and behold! The remaining 4 were all blue. “What are the odds,” I asked myself. So I […]

My office has a piece-of-junk Comcast cable modem that often needs to be rebooted. I got tired of walking back to the network closet, so I bought a USB relay for $30. Yeah, I could have simply bought a better modem, but where’s the fun in that? Here’s a photo of the relay board: After […]

Seriously. I don’t know how I ever created a Qt user interface without using stylesheets. This was, by far, the best idea Trolltech ever had. For today’s show-and-tell, I give you a nifty-looking QSlider with some nice gradient style applied to it: The handle has a nice hover effect, the bar has a moving gradient […]

I’ve encountered this problem a handful of times over the past few years using Qt’s layouts. Qt generally does a great job making sure that your Windows cannot be resized too small such that your content would be truncated. However, it seems that introducing a QStackedWidget causes a problem. These two screenshots illustrate the issue: […]

I wrote about multi-threading in Qt a while back, and how to use QThread to wrap a blocking function call “lock free”. Today we’ll talk about how to pass data into your thread. This approach can be used, for example, to tell your QThread to stop. There are two ways to use QThread, with and […]

The iPhone doesn’t (easily) let you change the colors of your calendar items. Couple this with the fact that there are lots of ways to setup calendar sync’ing, and it’s easy to get discouraged. For me, my work calendar and my personal calendar both showed up as nearly the same shade of red. Fail. Here’s […]

I’ve recently seen some confusion about the terms functional and procedural in the software development community. Let me spend a moment trying to clear things up for (both of) my readers. First of all, just because a programming language has functions, that does not mean it is functional. In fact, its confusing name has nothing […]