c++ socket通信例程

#include <WinSock2.h>
#include <stdio.h>

int main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(1, 1);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0)
{
return 0 ;
}
if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1)
{
WSACleanup();
return 0;
}
SOCKET sockSvr = socket(AF_INET, SOCK_DGRAM, 0);
SOCKADDR_IN addrSvr;
addrSvr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
addrSvr.sin_family = AF_INET;
addrSvr.sin_port = htons(6001);

bind(sockSvr, (SOCKADDR*)&addrSvr, sizeof(SOCKADDR));
char recvBuf[100];
char sendBuf[100];
char tempBuf[100];
SOCKADDR_IN addrClient;
int len = sizeof(SOCKADDR);

while (1)
{
recvfrom(sockSvr, recvBuf, 100, 0, (SOCKADDR*)&addrClient, &len);
if ('q' == recvBuf[0])
{
sendto(sockSvr, "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 enter data:\n");

gets(sendBuf);
sendto(sockSvr, sendBuf, strlen(sendBuf)+1, 0, (SOCKADDR*)&addrClient, len);
}
closesocket(sockSvr);
WSACleanup();

return 0;
}

#include <Winsock2.h>
#include <stdio.h>
int main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return 0;

}

if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 ) {
WSACleanup();
return 0;
}

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(6001);

char recvBuf[100];
char sendBuf[100];
char tempBuf[100];
int len=sizeof(SOCKADDR);

while (1)
{
printf("please enter date2:\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();

return 0;
}