VB图片自动预览，像幻灯片一样的效果，运行有些慢，代码还可以再优化，比较简单，是书中的一个例子，在此分享给VB初学者。-VB image automatic preview, a slideshow effect, the operation of some slow, code can be optimized, relatively simple, is an example in the book, in this share to VB beginners.