Archive for the ‘Software Development’ Category

The language isn’t new: Kotlin was created more than 5 years ago by JetBrains engineers. A preview version was released in 2011. Kotlin is a statically typed programming language for the Java Virtual Machine (JVM). Being crude, you could say that it’s “just another” enhancement of the Java language, just like Groovy or Scala. Nice, but hardly indispensable.

But Kotlin made a name for itself in May 2017, when Google announced “that it is making Kotlin […] a first-class language for writing Android apps” (in the words of Frederic Lardinois on TechCrunch). The Wired website has a bit more info on why the language was developed and why it is so “hot” these days. And the article concludes:

And its applications extend well beyond Google’s platform. Like Java, it can be used to write apps that run on desktops and servers as well. Plus, JetBrains has released tools for translating Kotlin code into code that can run on iOS or even in web browsers. All of which is to say, you can expect to find yourself using apps written in Kotlin more and more often in the coming months and years.

I have not yet written a line of Kotlin, but perhaps I should try that sooner rather than later. Since I’m also looking at Apple’s Swift language, the combination of learning both could be beneficial… or problematic, since someone asserts that both are quite similar (but not the same, of course): see “Swift is like Kotlin” for details.

I still would like to know how the name “Kotlin” was chosen…

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Of course I’m going to try this out: “Huzzah, Visual Studio for Mac is now available to all“!

Click the image to see more details about the product

Click the image to see more details about the product

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Last weekend, I spotted two old BMW motorcycles on the road in the port of Antwerp (Belgium). I had my camera in my hands, so I managed a few badly-framed photos – you can see them on Flickr.

By chance, I also spotted an advertisement for a similar bike. I don’t pretend to be a specialist on the subject, but I haven’t seen many BMW R50/2’s in this color scheme (not even on Google Images), and I find this combination quite flattering!

A fine-looking oldie, as seen in one
of the last advertisements on Kapaza

When I said I found this “zoekertje” by chance, I meant that I just had a quick look at the Kapaza website, because the site announced just last week that it will be closing down in a few days. I have visited that site, with its thousands of advertisements for second-hand stuff in many categories, while on the prowl for say another bike or a special lens for my camera. Kapaza is (was) one of the few big Belgian websites that used ColdFusion for at least parts of its site, and that made me pay a bit more attention to it also. This is one more website that won’t last half a century and more, unlike the motorcycle shown here!

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Last week, I did loose a lot of time in what should have been a quick ColdFusion hack. My colleagues and I were just trying to set up a web service-based solution for a simple problem: they had a JavaScript page that needed a bit of data for which I already had the code in ColdFusion. So I created a new directory in an existing application, whipped up the required code in ‘index.cfm‘ to return a bit of JSON and tested the result from my browser… only to get an “Error 500 - Application index.cfm could not be found“.

Weird, heh? The required file was there, so why could CF11 not find it? Adding an ‘Application.cfm‘ did not help, neither did repackaging the code in a CFC. On CF8, on the other hand, everything worked as expected. So what was going on?

It took some time, but I did find the explanation: CF11 reserves the directory name ‘api’ for special treatment, so you can’t use it like any other directory name – and of course that was the name I had chosen! Adam Tuttle described the situation nicely in 2015:

Funny you should mention that the issue is inside an /api folder. I’m trying to track down the same problem, except I’m directly accessing an index.cfm (sort of — onRequest intercepts the request and redirects to CFCs as appropriate — it’s a Taffy API) and I’ve found that renaming the folder from /api to … literally anything else… works fine. It’s almost as if something in CF has special meaning at /api, like the special /rest mapping does.

Indeed, renaming my directory solved the problem – too bad it took me so long to find the cause. On to the next problem!

PS. Adam Tuttle has more to say on the subject, but his post on the subject has disappeared: the URL ‘http://fusiongrokker.com/post/coldfusion-11-sometimes-chokes-on-api‘ no longer points to the relevant text, but is redirected to another blog also belonging to Adam Tuttle. There, unfortunately, the post is NOT available. I won’t call this a case of linkrot, but it’s not good either. Luckily, the Wayback Machine has a copy of the page, including a few comments…

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Brent Simmons isn’t a new name in this blog – I have cited his name several times since 2001. A few days ago he wrote:

It’s been years since I could build the Frontier kernel — but I finally got it building.

The high-level goal is to make that tool available again, because I think we need it.

The plan is to turn it into a modern Mac app, a 64-bit Cocoa app, and then add new features that make sense these days. (There are so many!) But that first step is a big one.

“Frontier Is Interesting”, says Jim Roepcke – click to see what he writes

It’s an interesting development, from several viewpoints. I wrote some of my first “web applications” in Frontier, and that makes that Frontier will always have a special place in my book of tools. It’s also nice to see a relevant piece of software evolve so that it continues to run on modern hardware and OS’s. At some point, I will certainly download and run a copy on my Mac.

But the question is: do I want to go back to developing stuff in Frontier? Do you want to?

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It’s something I need to remember: how do I install an old PyUSB package on Xubuntu (or a similar Debian-based OS). Why, you ask? Because I need that old version 0.4.3 for the little script that reads the solar energy numbers from the SMA Sunny Beam.

Image of the SMA Sunny Beam monitor for our solar panel installation

The SMA Sunny Beam monitor for our solar panel installation

Luckily, it isn’t too hard to do. This is my context:

Step one is to make sure you have the required header files to compile the PyUSB package. So you open up a terminal session and execute

sudo apt-get install libusb-dev
sudo apt-get install python-dev

Step two: Extract the root folder and all the files from the PyUSB archive, and make that folder your current directory in the terminal session.

Step three: compile and install the package with this command:

sudo python setup.py install

That’s it. When all goes well, you’ll be able to verify the existence of two new files on your system, in a directory called “/usr/local/lib/python2.7/dist-packages“:



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More than 8 years ago, I wrote about the Google App Engine as a platform. Much as I liked the concept, I also remarked that it would be… great to have a complete development environment within the browser, coupled to a runtime.

Turns out that Fog Creek, the software company founded by Joel Spolsky, has built just that: “a developer playground for building full-stack web-apps fast“. It’s called Gomix – but it was called HyperDev during the development of the product. That ties in neatly with my reference to HyperCard as an example of a simple tool that allows anyone to built the tool she/he needs. Nice work, Joel !

So here it is, my first “app” in Gomix (just for fun and with lots of tongue in cheek):


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