网络通信之简易聊天室（UDP实现）

服务端程序

#include <Winsock2.h>
#include <stdio.h>
#pragma comment(lib,"Ws2_32.lib")
void main()
{
///////////配置了socket的版本信息
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 1, 1 );
////0  成功
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return;
}

if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 ) {
WSACleanup( );
return;
}
//////////////////////////
/*
socket函数的使用
SOCKET sockSrv=socket(AF_INET,SOCK_DGRAM,0);

*/
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);

bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

char recvBuf[100];
char sendBuf[100];
char tempBuf[200];

SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);

while(1)
{
recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);
if('q'==recvBuf[0])
{
sendto(sockSrv,"q",strlen("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);
printf("Please input data:\n");
gets(sendBuf);
sendto(sockSrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrClient,len);
}
closesocket(sockSrv);
WSACleanup();
}

客户端程序

#include <Winsock2.h>
#include <stdio.h>
#pragma comment(lib,"Ws2_32.lib")
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;
}

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_addr.S_un.S_addr=inet_addr("192.168.1.90");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);

char recvBuf[100];
char sendBuf[100];
char tempBuf[200];

int len=sizeof(SOCKADDR);

while(1)
{
printf("Please input data:\n");
gets(sendBuf);
sendto(sockClient,sendBuf,strlen(sendBuf)+1,0,
(SOCKADDR*)&addrSrv,len);
recvfrom(sockClient,recvBuf,100,0,(SOCKADDR*)&addrSrv,&len);
if('q'==recvBuf[0])
{
sendto(sockClient,"q",strlen("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();
}