说明：  初学QT编程，将我用QT编写的图片浏览器程序共享给大家，压缩包包含源代码及发布程序。里面注释比较全面，适合初学者。实现了滚轮缩放图片，及鼠标抓取移动图片功能。
(Beginner QT programming, I have written with QT Picture Viewer program for everyone to share, compressed package that contains the source code and release procedures. Which comment is more comprehensive, suitable for beginners. To achieve a scroll wheel to zoom pictures, and mouse crawl Moving Pictures.)