说明：  利用条形码扫描器销售商品，VB利用条形码扫描器销售商品，以一个图书销售为例，利用条形码扫描器直接查询出对应商品，这种应用现在被广泛应用于超市、品牌销售店等众多地方，很不错的应用，本源码也是很简单的，VB新手也可以看懂。
(Sales of goods using a barcode scanner, VB sales of goods using a barcode scanner to a book sales as an example, the use of barcode scanners directly query the corresponding commodity, this application is now widely used in many local supermarkets, shops and other brand sales, it is good application, the source is very simple, VB novice can understand.)