网络编程tcp协议源代码

int tcp_server(void) { int sockfd; int new_fd; struct sockaddr_in server_addr; struct sockaddr_in client_addr; char buffer[128]; int nByte; int sin_size; //1.创建套接字 if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { printf("create socket error!\n"); exit(1); } //2.1设置要绑定的地址 bzero((char *)&server_addr, sizeof(struct sockaddr_in)); server_addr.sin_family = AF_INET; server_addr.sin_port = htons(portnum); //字节序(大小端) server_addr.sin_addr.s_addr = htonl(INADDR_ANY); //2.绑定地址 bind(sockfd,(struct sockaddr*)(&server_addr),sizeof(struct sockaddr)); //3.监听端口 listen(sockfd,5); while(1) { //4.等待连接 sin_size = sizeof(struct sockaddr_in); new_fd = accept(sockfd,(struct sockaddr*)(&client_addr),&sin_size);//注意:第3个参数为socklen_t*（整形的指针） printf("server get connection from %s\n",inet_ntoa(client_addr.sin_addr)); //将整数型的IP地址转化为字符型(192.168.1.1) //5.接收数据 nByte = recv(new_fd, buffer, 128, 0); buffer[nByte] = '\0'; printf("server reciivd : %s\n", buffer); //6.结束连接 close(new_fd); } close(sockfd); return 0; } int tcp_client(void) { struct sockaddr_in server_addr; char buffer[128]; //1.创建套接字 int sockfd; if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { printf("create socket error!\n"); exit(1); } //2.1设置要连接的服务器的地址 bzero((char *)&server_addr, sizeof(struct sockaddr_in)); server_addr.sin_family = AF_INET; server_addr.sin_port = htons(portnum); server_addr.sin_addr.s_addr = inet_addr("192.168.10.50"); //2.连接服务器 if(connect(sockfd,(struct sockaddr*)(&server_addr),sizeof(struct sockaddr)) == -1) { printf("connect error\n"); exit(1); } //3.发送数据到服务器 printf("please input char:\n"); fgets(buffer,128,stdin); send(sockfd, buffer, strlen(buffer), 0); //4.关闭连接 close(sockfd); return 0; }