简单UDPsocket编程

服务器端服务器端 ntUdpServer cpp Defines the entry point for the console application include stdafx h include include winsock2 h winsock 2 2 library pragma comment lib ws2 32 lib define PORT 8888 define ADDR 127 0 0 1 int main int argc char argv WSADATA wsock SOCKET sersocket SOCKADDR IN serAddr int serAddrsize sizeof serAddr int nRet 0 char buf 1024 int PORT char ADDR PORT atoi argv 2 ADDR argv 1 初始化 Winsock 2 2 printf nInitialising Winsock n if WSAStartup MAKEWORD 2 2 exit 0 printf Initialised successfully n 创建 socket printf nCreating UDP Socket n if sersocket socket AF INET SOCK DGRAM IPPROTO UDP INVALID SOCKET printf Creation of socket failed d n WSAGetLastError WSACleanup return 0 printf UDP Socket Created successfully n 设置 SOCKADDR IN 地址结构 serAddr sin family AF INET serAddr sin port htons PORT serAddr sin addr s addr INADDR ANY serAddr sin addr s addr inet addr ADDR 绑定套接字 if bind sersocket SOCKADDR closesocket sersocket WSACleanup return 0 printf Waiting to receive data n for int i 0 i if nRet recvfrom sersocket buf sizeof buf 0 SOCKADDR closesocket sersocket WSACleanup return 0 printf The data was received from s d n inet ntoa serAddr sin addr ntohs serAddr sin port 显示接收到的数据 printf buf printf n if nRet sendto sersocket buf strlen buf 0 SOCKADDR closesocket sersocket WSACleanup return 0 若发现 exit 则退出处理循环 if strncmp buf exit sizeof exit 0 printf exit the receiving loop n break 关闭套接字 closesocket sersocket WSACleanup return 0 客户端客户端 ntUdpClient cpp Defines the entry point for the console application include stdafx h include include winsock2 h winsock 2 2 library pragma comment lib ws2 32 lib define PORT 8888 define ADDR 127 0 0 1 int main int argc char argv WSADATA wsock SOCKET clisocket SOCKADDR IN serAddr int serAddrsize sizeof serAddr int nRet 0 char buf 1024 int PORT char ADDR PORT atoi argv 2 ADDR argv 1 初始化 Winsock 2 2 printf nInitialising Winsock n if WSAStartup MAKEWORD 2 2 exit 0 printf Initialised successfully n 创建 socket printf nCreating UDP Socket n if clisocket socket AF INET SOCK DGRAM IPPROTO UDP INVALID SOCKET printf Creation of socket failed d n WSAGetLastError WSACleanup return 0 设置 SOCKADDR IN 地址结构 serAddr sin family AF INET serAddr sin port htons PORT serAddr sin addr s addr INADDR ANY serAddr sin addr s addr inet addr ADDR printf UDP Socket Created successfully n printf Trying to send messages n for int i 0 i memset buf 0 sizeof buf printf nMessage to be sent gets buf if nRet sendto clisocket buf strlen buf 1 0 SOCKADDR closesocket clisocket WSACleanup return 0 printf The data was sent to s d successfully n inet ntoa serAddr sin addr ntohs serAddr sin port if strncmp buf exit sizeof exit 0 break memset buf 0 sizeof buf if nRet recvfrom clisocket buf sizeof buf 0 SOCKADDR closesocket clisocket WSACleanup return 0 显示接