flex 打印功能，flex datagril的打印实现，同时支持到报表的拖拽功能-flex printing, flex datagril print to achieve, while the drag and drop support to the report

How to F/W update. 1) Connect PC and printer with USB cable. 2) Turn on the power of printer.(Ready Status) 3) Drag the f/w file and Drop down on the usbprn2.exe. And then f/w update will be started automatically. 4) Please wait until