基于UDP的简单的聊天程序

//UDP  服务器

#include <Winsock2.h>
#include <stdio.h>

void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(1,1);
err = WSAStartup(wVersionRequested,&wsaData);

if(err != 0)
{
return;
}

if(LOBYTE(wsaData.wVersion ) != 1 ||
HIBYTE(wsaData.wVersion ) != 1 )
{
WSACleanup();
return;
}

//创建套接字
SOCKET sockSrv = socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr .S_un .S_addr = htonl(INADDR_ANY);
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(6000);

//绑定套接字
bind(sockSrv,(SOCKADDR*) &addrSrv,sizeof(SOCKADDR));

//等待并接受数据

/*SOCKADDR_IN addrClient;
int len = sizeof(SOCKADDR);
char recvBuf[100];
recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR *) &addrClient,&len);
printf("%s\n",recvBuf);*/

//基于UDP的简单聊天程序
char recvBuf[100];
char sendBuf[100];
char tempBuf[100];

SOCKADDR_IN addrClient;
int len = sizeof(SOCKADDR);

while(1)
{
//等待数据并接收数据
recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);
if('q' == recvBuf[0])
{
sendto(sockSrv,"word Q",strlen("word Q")+1,0,(SOCKADDR *) &addrClient,len);
printf("chat end \n");
break;
}
sprintf(tempBuf,"%s say : %s",inet_ntoa(addrClient.sin_addr),recvBuf);

printf("%s\n",tempBuf);

//发送数据
printf("Please input data :\n");
gets(sendBuf);
sendto(sockSrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrClient,len);

}

closesocket(sockSrv);
WSACleanup();

}

//UDP 客户端

#include <Winsock2.h>
#include <stdio.h>

void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(1,1);
err = WSAStartup(wVersionRequested,&wsaData);

if(err != 0)
{
return;
}

if(LOBYTE(wsaData.wVersion ) != 1 ||
HIBYTE(wsaData.wVersion ) != 1 )
{
WSACleanup();
return;
}

//创建套接字
SOCKET sockClient= socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr .S_un .S_addr = inet_addr("127.0.0.1");
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(6000);

//发送数据
//sendto(sockClient,"Hello my love",strlen("Hello my love")+1,0,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

//基于UDP的简单聊天程序 client
char recvBuf[100];
char sendBuf[100];
char tempBuf[100];

//SOCKADDR_IN addrClient;
int len = sizeof(SOCKADDR);

while(1)
{
//发送数据
printf("Please input data :\n");
gets(sendBuf);
sendto(sockClient,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrSrv,len);

//等待数据并接收数据
recvfrom(sockClient,recvBuf,100,0,(SOCKADDR*)&addrSrv,&len);
if('q' == recvBuf[0])
{
sendto(sockClient,"word Q",strlen("word Q")+1,0,(SOCKADDR *) &addrSrv,len);
printf("chat end \n");
break;
}
sprintf(tempBuf,"%s say : %s",inet_ntoa(addrSrv.sin_addr),recvBuf);

printf("%s\n",tempBuf);

}

closesocket(sockClient);
WSACleanup();

}