利用vc实现的局域网文件传输，共分为客户端和服务器端两部分，该部分是文件传输的服务器端，采用了TCP/UDP协议，可扩展到net网络传输！-use vc achieve LAN file transfer, is divided into client and server-side two, The file transfer is part of the server using the TCP/UDP protocol, whic