C++ and Qt GUI for my Project

I made one Arduino Robot with it Physic Control Panel, but I like make a GUI too. I want make in Qt and C++, but there's few documentations for its. I found only this projects (http://www.instructables.com/id/Control-your-arduino-from-your-PC-with-the-Qt-Gui/) , but I cannot read it sourcecode. I have some questions. What is the library that I must used: Firmdata or qExtSerialPort? I want use the easiest. I like see others example of GUIs in C++ and Qt.

Thanks!

Sorry, my english is very bad.

Hat anydony maken same something? I cannot believe it.