用VC++开发的用于实现打印的功能，基本功能已经完成，现在只差串行化，连续打印库存，欢迎大家一起努力修改-Developed with VC++ used to implement printing features, the basic function has been completed and is now only a thin serial, continuous print inventory, we welcome efforts to revise

打印、打印预览、黑白打印、串行化打印、打印对话框设计。-Print, Print Preview, black and white printing, serial print, print dialog design.