read device with TQt

Hi, as I am advancing with TQt slowly, there are many things I want to know, so I am wondering right now what is the convenient method of reading a device, so that I can trigger somethin on events emitted by the device. I see there are few classes based on TQIODevice, but which should I use. I am interested in following: http://jwhsmith.net/2015/02/manipulating-rfkill-using-devices-programmatica… I am sure there is a good example somewhere and you know exactly where. thanks in advance regards