在ubuntu下用Qt编写的一个led灯的亮灭程序，就是把LED这个灯的效果用一个类来实现，这样你想要在哪里放置一个led，直接放，就像用Qt下的其他Qwidget控件一样，很方便-Written with Qt under ubuntu led lamp light off the program, is the effect of this LED lamp with a class to achieve, so you want to place a led, where direct d