命令列引數：
server.exe portnumber，例如server 8000
client.exe ipaddress portnumber，例如client 127.0.0.1 8000
然後在客戶端的命令列輸入字串並回車，客戶端將會把訊息傳送到伺服器。伺服器再把訊息傳回客戶端。
伺服器端，server.cpp：
#include
#include
#include
#pragma comment(lib,"ws2_32.lib")
int main(int argc, char* argv)
//把埠號轉化成整數
short port;
if((port = atoi(argv[1]))==0)
wsadata wsa;
//初始化套接字dll
if(wsastartup(makeword(2,2),&wsa)!=0)
//建立套接字
socket serversocket;
if((serversocket=socket(af_inet,sock_stream,ipproto_tcp))==invalid_socket)
struct sockaddr_in serveraddress;
memset(&serveraddress,0,sizeof(sockaddr_in));
serveraddress.sin_family=af_inet;
serveraddress.sin_addr.s_un.s_addr = htonl(inaddr_any);
serveraddress.sin_port = htons(port);
//繫結
if(bind(serversocket,(sockaddr*)&serveraddress,sizeof(serveraddress))==socket_error)
//進入偵聽狀態
if(listen(serversocket,somaxconn)==socket_error)
printf("server %d is listening......\n",port);
socket clientsocket;//用來和客戶端通訊的套接字
struct sockaddr_in clientaddress;//用來和客戶端通訊的套接字位址
memset(&clientaddress,0,sizeof(clientaddress));
int addrlen = sizeof(clientaddress);
//接受連線
if((clientsocket=accept(serversocket,(sockaddr*)&clientaddress,&addrlen))==invalid_socket)
printf("accept connection from %s\n",inet_ntoa(clientaddress.sin_addr));
char buf[4096];
while(1)
buf[bytes]='\0';
printf("message from %s: %s\n",inet_ntoa(clientaddress.sin_addr),buf);
if(send(clientsocket,buf,bytes,0)==socket_error)
}
//清理套接字占用的資源
wsacleanup();
return 0;
}客戶端，cilent.cpp：
#include
#include
#include
#pragma comment(lib,"ws2_32.lib")
int main(int argc, char* argv)
//把字串的ip位址轉化為u_long
unsigned long ip;
if((ip=inet_addr(argv[1]))==inaddr_none)
//把埠號轉化成整數
short port;
if((port = atoi(argv[2]))==0)
printf("connecting to %s:%d......\n",inet_ntoa(*(in_addr*)&ip),port);
wsadata wsa;
//初始化套接字dll
if(wsastartup(makeword(2,2),&wsa)!=0)
//建立套接字
socket sock;
if((sock=socket(af_inet,sock_stream,ipproto_tcp))==invalid_socket)
struct sockaddr_in serveraddress;
memset(&serveraddress,0,sizeof(sockaddr_in));
serveraddress.sin_family=af_inet;
serveraddress.sin_addr.s_un.s_addr = ip;
serveraddress.sin_port = htons(port);
//建立和伺服器的連線
if(connect(sock,(sockaddr*)&serveraddress,sizeof(serveraddress))==socket_error)
char buf[4096];
while(1)
int bytes;
if((bytes=recv(sock,buf,sizeof(buf),0))==socket_error)
buf[bytes]='\0';
printf("message from %s: %s\n",inet_ntoa(serveraddress.sin_addr),buf);
}//清理套接字占用的資源
wsacleanup();
return 0;
}
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