说明：  此为刷卡器充值上位机软件，包括COM口检测各种无效卡显示，及其VB界面的各种设置。及其数据库的设置。麻雀虽小五脏俱全，对于学习VB的新手来说会很有帮助
(This is the credit card recharge PC browser software, including COM port detected a variety of invalid card show, and the VB interface, various settings. And database settings. Sparrows are small is a fully-equipped for learning VB would be helpful for the novice)