网络通信编程demo1[Udp]

UdpServer:

#include <winsock2.h>#include <stdio.h>/* udp server */void main(){WORD wVersionRequested = MAKEWORD(2,2);WSADATA wsaData;if (WSAStartup(wVersionRequested,&wsaData)!=0){printf("WSAStartup failure/n");WSACleanup();return;}printf("server Startup success/n");SOCKET sockSvr = socket(AF_INET,SOCK_DGRAM,0);if (sockSvr==INVALID_SOCKET){printf("server create socket failure/n");WSACleanup();return;}printf("server create socket success/n");SOCKADDR_IN sadressIn;sadressIn.sin_addr.S_un.S_addr = htonl(INADDR_ANY);sadressIn.sin_family = AF_INET;sadressIn.sin_port = htons(6000);if (bind(sockSvr,(SOCKADDR*)&sadressIn,sizeof(SOCKADDR))!=0){printf("server bind failure/n");WSACleanup();return;}printf("server bind success/n");//recevie message from client;char recvBuffer[128];SOCKADDR_IN sadressInClient;int len = sizeof(SOCKADDR);recvfrom(sockSvr,recvBuffer,128,0,(SOCKADDR*)&sadressInClient,&len);printf("come from client's message: %s/n",recvBuffer);closesocket(sockSvr);WSACleanup();}

 

UdpClient:

#include <stdio.h>#include <WINSOCK2.H>/* udp client */void main(){WORD wVersionRequested = MAKEWORD(2,2);WSADATA wsaData;if (WSAStartup(wVersionRequested,&wsaData)!=0){printf("client WSAStartup failure/n");WSACleanup();return;}printf("client Startup success/n");SOCKET sockClient = socket(AF_INET,SOCK_DGRAM,0);if (sockClient==INVALID_SOCKET){printf("client create socket failure/n");WSACleanup();return;}printf("client create socket success/n");//send message to serverchar sendBuffer[] = "Hello,QQ";SOCKADDR_IN saddressSvr;saddressSvr.sin_addr.S_un.S_addr = inet_addr("192.168.0.100");saddressSvr.sin_family = AF_INET;saddressSvr.sin_port = htons(6000);sendto(sockClient,sendBuffer,strlen(sendBuffer)+1,0,(SOCKADDR*)&saddressSvr,sizeof(SOCKADDR));printf("client send message 'Hello,QQ' to server/n");closesocket(sockClient);WSACleanup();printf("client has close/n");}