简单的UDP协议实现

 

服务器端：

#include <winsock2.h>#include <stdio.h>int main(){//1.启动WinsockWORD wVersionRequested;WSADATA wsaData;wVersionRequested = MAKEWORD(2,2);if(WSAStartup(wVersionRequested,&wsaData)){printf("Startup fail! Can not find a usable WinSock DLL./n");return 0;}//2.创建数据报套接字SOCKET fd_Server = socket(AF_INET,SOCK_DGRAM,0);if(INVALID_SOCKET == fd_Server){printf("socket error!/n");}//3.本地地址绑定套接字，以使在网络上标识该套接字SOCKADDR_IN serverAddr;serverAddr.sin_family = AF_INET;serverAddr.sin_port = htons(11111);serverAddr.sin_addr.S_un.S_addr = inet_addr("0.0.0.0");if(bind(fd_Server,(SOCKADDR*)&serverAddr,sizeof(SOCKADDR_IN))){printf("bind error!/n");}/*******************************************************************************///4.接收客户端数据SOCKADDR_IN clientAddr;ZeroMemory(&clientAddr, sizeof(clientAddr));char data[100];memset(data,0,100);int size = sizeof(SOCKADDR_IN);recvfrom(fd_Server,data,100,0,(SOCKADDR*)&clientAddr,&size);printf("服务器接收到数据: %s/n",data);printf("客户端IP:Port为: %s:%d/n",inet_ntoa(clientAddr.sin_addr),clientAddr.sin_port);//5.发送数据到客户端if(SOCKET_ERROR == sendto(fd_Server,data,100,0,(SOCKADDR*)&clientAddr,size)){printf("sendto函数错误代码：%d/n",WSAGetLastError());}/*******************************************************************************///6.洗洗睡吧closesocket(fd_Server);//关闭套接字WSACleanup();//终止Winsockreturn 0;}

 

 

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客户端：

#include <WINSOCK2.H>#include <stdio.h>int main(){//1.启动WinsockWORD wVersionRequested;WSADATA wsaData;wVersionRequested = MAKEWORD(2,2);if(WSAStartup(wVersionRequested,&wsaData)){printf("Startup fail! Can not find a usable WinSock DLL./n");return 0;}//2.创建数据报套接字SOCKET fd_client = socket(AF_INET,SOCK_DGRAM,0);//3.设定服务器地址SOCKADDR_IN serverAddr;serverAddr.sin_family = AF_INET;serverAddr.sin_port = htons(11111);serverAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");/********************************************************************************///4.向服务器发送数据char data[100] = "客户端发送数据！";int size = sizeof(SOCKADDR_IN);sendto(fd_client,data,100,0,(SOCKADDR*)&serverAddr,size);//5.接收服务器数据char content[100];memset(content,0,100);recvfrom(fd_client,content,100,0,(SOCKADDR*)&serverAddr,&size);printf("client receive: %s/n",content);/********************************************************************************/closesocket(fd_client);WSACleanup();return 0;}