UDP伺服器客戶端相互通訊

udp伺服器、客戶端之間的相互通訊

之前的版本只能實現udp伺服器之間單發單收，此版本能實現udp伺服器和客戶端之間的相互通訊。

見下面的程式：

udp_server.c

#include #include #include #include #include #include #include #define port 3333

int main()
;    if((sockfd = socket(af_inet, sock_dgram, 0)) < 0)
bzero(&server_addr, sizeof(struct sockaddr_in));
server_addr.sin_family = af_inet;
server_addr.sin_addr.s_addr = htonl(inaddr_any);
server_addr.sin_port = htons(port);
if(bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
while(1)
buf[recvbytes] = '\0';
printf("receive from client is %s", buf);
printf("please input:");
fgets(buf1, 1024, stdin);
sendto(sockfd, buf1, 1024, 0, (struct sockaddr *)&client_addr, sizeof(struct sockaddr));
}    close(sockfd);
return 0;
}

#include #include #include #include #include #include #include #define port 3333

int main()
bzero(&server_addr, sizeof(struct sockaddr_in));
server_addr.sin_family = af_inet;
//server_addr.sin_addr.s_addr = inet_addr("192.168.1.222");
server_addr.sin_addr.s_addr = htonl(inaddr_any);
server_addr.sin_port = htons(port);
while(1)
memset(buf1, 0, sizeof(buf1));
bzero(&client_addr, sizeof(struct sockaddr_in));
if(recvfrom(sockfd, buf1, sizeof(buf1), 0, (struct sockaddr *)&client_addr, &addrlen) < 0)
printf("receive from server:%s\n", buf1);
}    close(sockfd);
return 0;
}

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