usb打印机协议，介绍了如何获取打印机信息及如何封装打印机的包-usb printer protocol describes how to obtain printer information and how to package the printer package

自动通过系统信息检测当前插入的USB设备打印机，并通过USB端口发送数据打印-Detected automatically by the system information inserted USB device printer through the USB port to send data printing