这是一个通过组播+单播来对多台机器同时传输文件的模块，要求在局域网内传输-This is a multicast+ unicast come through for multiple machines to transfer files at the same time the module, requiring LAN transmission

TCP/IP Packet creator using RAW socket, needs some memory handling to make it ideal ,but it send (tcp/upd/icmp) packet to any machine in LAN

从光学系统的成像点列图计算系统MTF的简单小程序(Caculate the MTF of a optical system from its spt)