说明：  QT4与QT3在编程上有着很大的差别。尤其是用designer生成源码的时候差异性更大，本文介绍了在QT4下面如何使用designer生成源码，然后将自己的程序加入其中。适合想从QT3过度到QT4的初学者。
(QT4 programming with Qt3 share in the great difference. Particularly the designer to generate source code, when a greater difference, in QT4 This article describes how to use the designer to generate the following source code, and then will join with its own procedures. Suitable for Qt3 over from beginner to QT4.)