qt的学习笔记，从简单的hello qt，连接信号，对话框，菜单和工具条。。。到2D和3D图形系统，opengl调用，非常实用-qt learning notes, from a simple hello qt, connecting signal, dialog, menu and toolbar. . . To 2D and 3D graphics system, opengl calls, very useful

使用qt创建菜单和工具栏，学习信号槽的很好实例-it is very good examples of learning signal and slot ,withing qt to create menu and toolbar