It is quite easy to get up and running with Ubuntu on Virtual Box, however a few tweaks will help you get the best out of your Linux installation. You might notice that your Ubuntu VM appears to run quite slowly, recent Ubuntu releases involve quite a lot of fancy visual effects on the desktop […]
If you have a view that exports a filter form, you may find that the form is not displayed when the view is rendered in a block as a ‘block display’, even though it may display perfectly in a ‘page display’ as part of the same view. This problem had me rather worried until […]
Here’s something that you probably won’t want to do, but how can you restart or shut-down your Pi from software in python code? Well it’s both quite simple and quite tricky all at the same time, but in summary you can run some python code like this to shell out to the shutdown command: […]
There are multiple ways of making your app the default web2py application, they are detailed here in the section called ‘Application Init’. When an app is the default web2py app, you don’t have to specify its name in its url when you visit it in your browser. Here is a summary of the method […]
Q: I have a nice accordion in my web app set-up in twitter bootstrap but how can I programmatically open or close a section using javascript? A: Use the .collapse() function to open, close or toggle a collapsible accordion section. Consider this 2 section accordion: [crayon] Camera Settings The camera settings Acquisition Settings The acquisition […]
In Web2py if you want to change a model’s definition, you can first of all change the model’s software definition via its python code and then, (depending on your migration settings), the next time you launch your web app, web2py will attempt to alter your database structure to match your updated model. If this […]
Here is some code that shows how to create an 8bit grayscale cognex image (CogImage8Grey) from an 8bit raw image stored as a byte array (byte[]). This type of memory messing is difficult in .NET at the best of times and it’s just a pity the the cognex library doesn’t help much more than it […]
Here is a quick, dirty and inefficient example of how to save an 8bit Grey scale image stored in a C# byte array as a 32bit bitmap file (.bmp). Saving bitmaps can be quite suprisingly difficult in .NET so I am posting this for future reference! This code copies each byte (8 bit pixel) in […]
Here’s is a blog post that has some pictures of the (hopefully) soon to arrive camera for the Pi. http://www.raspberrypi.org/archives/3224 It will be interesting to see what cone be done from a machine vision or computer vision point of view with the Pi once cameras are available.
This took me a bit of time to figure out – how to create an empty SQL express database without using SQL Mangement Studio (I didn’t have it installed..) but instead using Visual Studio 2010 (and without having to add data sources, model definitions and other such muck into the context of a VS project) […]