c#调用通用热敏打印机POSDLL.dll的后台打印服务。 作用： 主要是省些去重写C#调用POSDLL.dll的方法。 还有就是了解后台打印的业务流程，对初学者，有很大的帮助-c# call POSDLL.dll common thermal printer spooler service. Role: mainly to rewrite some C# method calls POSDLL.dll province. There is spooling understand b