网络程序设计--UDP通信（服务器）
代码中包含自己头文件见：
http://blog.csdn.net/jianxia_wzx/article/details/8515585
//////////////////////////////////////////////////////////// UDPServer.cpp文件#include "../common/InitSock.h"#include <stdio.h>CInitSock initSock;// 初始化Winsock库int main(){// 创建套节字SOCKET s = ::socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);if(s == INVALID_SOCKET){printf("Failed socket() \n");return 0;}// 填充sockaddr_in结构sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(4567);sin.sin_addr.S_un.S_addr = INADDR_ANY;// 绑定这个套节字到一个本地地址if(::bind(s, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR){printf("Failed bind() \n");return 0;}// 接收数据char buff[1024];sockaddr_in addr;int nLen = sizeof(addr);while(TRUE){int nRecv = ::recvfrom(s, buff, 1024, 0, (sockaddr*)&addr, &nLen); if(nRecv > 0){buff[nRecv] = '\0';printf(" 接收到数据（%s）：%s", ::inet_ntoa(addr.sin_addr), buff);}}::closesocket(s);}