TCP网络程序设计

 1 #include <stdio.h>
 2 #include <sys/socket.h>
 3 #include <string.h>
 4 #include <netinet/in.h>
 5 
 6 #define portnum 3333
 7 
 8 int main()
 9 {
10     int sockfd ,new_fd;
11     struct sockaddr_in server_addr;
12     struct sockaddr_in client_addr;
13     char buffer[128];
14     int nbyte;
15     int sin_size;
16     //创建套接字
17     if((sockfd = socket(AF_INET,SOCK_STREAM,0))== -1)
18     {
19         printf("create socket error.\n");
20         exit(1);
21     }
22     //2.1设置要绑定的地址
23     bzero(&server_addr,sizeof(struct sockaddr_in));
24     sockaddr_in.sin_family = AF_INET;
25     sockaddr_in.sin_port = htons(portnum);//客户机转为网络字符序
26     sockaddr_in.sin_addr.s_addr = htonl(INADDR_ANY);//客户机转为网络字符序
27     //2.2绑定地址
28     bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr));
29     //3.监听端口
30     listen(sockfd,5);
31     while(1)
32     {
33         //4.等待连接
34         sin_size = sizeof(struct sockaddr);
35         new_fd = accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size);
36         printf("server get connection from %s\n",inet_ntoa(client_addr.sin_addr));
37         //5.接收数据
38         nbyte = recv(new_fd,buffer,128,0);
39         buffer[nbyte]=‘\0‘;
40         printf("server received : %s\n",buffer);
41         //6.结束连接
42         colse(new_fd);
43 
44     }
45     close(sockfd);
46     
47     return 0;
48 }

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <sys/socket.h>
 4 #include <netinet/in.h>
 5 
 6 #define portnum 3333
 7 
 8 int main()
 9 {
10     struct sockaddr_in server_addr;
11     int sockfd;
12     char buffer[128];
13 
14     //1.创建套接字
15     if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
16     {
17         printf("create socket error.\n");
18         exit(1);
19     }
20     //2.1设置要链接的服务器的地址
21     bzero(&server_addr,sizeof(struct sockaddr_in));
22     server_addr.sin_family = AF_INET;
23     server_addr.sin_port = htons(portnum);
24     server_addr.sin_addr.s_addr = inet_addr("192.168.1.113");//服务器IP地址
25     //2.链接服务器
26     if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr)) == -1)
27     {
28         printf("connect error.\n");
29         exit(1);
30     }
31     //3.发送数据到服务器
32     printf("Please input char:\n");
33     fgets(buffer,128,stdin);
34     send(sockfd,buffer,strlen(buffer),0);
35     //4.关闭连接
36     close(sockfd);
37 
38     return 0;
39 }