Posts

Recently I needed to acquire some database. Unfortunately it was published only as a website that presented 50 records per single page. Whole database had more than 150 thousand records. What to do in such situation? Click through 3000 pages, manually collecting data in a text file? One week and it’s done! ;) Better to write a program (so called scraper) which will do the work for you. The program has to do three things:

Recently, I wanted to extract calls to external system from log files and do some LINQ to XML processing on obtained data. Here’s a sample log line (simplified, real log was way more complicated but it doesn’t matter for this post):

Bitmap class has GetPixel and SetPixel methods that let you acquire and change color of chosen pixels. Those methods are very easy to use but are also extremely slow. My previous post gives detailed explanation on the topic, click here if you are interested.

Let’s suppose that we have some model that has a list property and we want to render some radio buttons for items of that list. Take the following basic setup as an example.

Coordinate system in HTML5 Canvas is set up in such a way that its origin (0,0) is in the upper-left corner. This solution is nothing new in the world of screen graphics (e.g. the same goes for Windows Forms and SVG). CRT monitors, which were standard in the past, displayed picture lines from top to bottom and image within a line was created from left to right. So locating origin (0,0) in the upper-left corner was intuitive and it made creating hardware and software for handling graphics easier.

Probably everyone who creates or debugs a program happens to make temporary changes to the code that make current task easier but should never get into the repository. And probably everyone has accidentally put such code into next revision. If you are lucky enough, mistake will be revealed quickly and the only result will be a bit of shame, if not…

Imagine you have to provide support for some really old web application. The app has one main window and pop-up windows that show some sensitive information (for example payroll list). Client wants to ensure that all pop-ups are closed when user leaves main window or clicks “logout” button in this window…