tcp client

linux下tcp server，运行文件./tcpserver 8001

 1 #include<stdlib.h>
 2 #include<stdio.h>
 3 #include<string.h>
 4 #include<errno.h>
 5 #include<string.h>
 6 #include<netdb.h>
 7 #include<sys/types.h>
 8 #include<netinet/in.h>
 9 #include<sys/socket.h>
10 #include<unistd.h>
11 #include<arpa/inet.h>
12 //portnumber 8080
13 
14 int main(int argc ,char *argv[])
15 {
16     int sockfd,new_fd;
17     struct sockaddr_in server_addr;
18     struct sockaddr_in client_addr;
19     int sin_size,iDataNum;
20     int portnumber;
21 //    const char hello[]="Hello cpp, you are success.
";
22     char buffer[4096];
23     strcpy(buffer, "test111
");
24 
25     if(argc!=2)
26     {
27          fprintf(stderr,"Usage:%s portnumbera
",argv[0]);
28          return 0;
29     }
30     portnumber = atoi(argv[1]);
31     if(portnumber < 0)
32     {
33         fprintf(stderr,"Usage:%s portnumbera
",argv[0]);
34         return 0;
35     }
36     if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
37     {
38         fprintf(stderr,"Socket error:%s
a",strerror(errno));
39         return 0;
40     }
41     bzero(&server_addr,sizeof(struct sockaddr_in));
42     server_addr.sin_family=AF_INET;
43     server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
44     server_addr.sin_port=htons(portnumber);
45     if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
46     {
47         fprintf(stderr,"Bind error:%s
a",strerror(errno));
48         return 0;
49     }
50     if(listen(sockfd,5)==-1)
51     {
52         fprintf(stderr,"Listen error:%s
a",strerror(errno));
53         return 0;
54     }
55     while(1)
56     {
57         sin_size=sizeof(struct sockaddr_in);
58         if((new_fd = accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size)) == -1)
59         {
60             fprintf(stderr,"Accept error:%s
a",strerror(errno));
61             return 0;
62         }
63         fprintf(stdout,"Server get connection from %s
",inet_ntoa(client_addr.sin_addr));
64         // iDataNum=recv(new_fd,buffer,4096,0);
65         // if(iDataNum<0)
66         // { 
67             // perror("Recv
");
68             // exit(1);
69         // }
70             //printf("Recv data is %s
",buffer);
71             send(new_fd, buffer, strlen(buffer), 0);
72             // if(write(new_fd,hello,strlen(hello))==-1)
73             // {
74             //      fprintf(stderr,"write error:%s
",strerror(errno));
75             //      return 0;
76             // }
77         close(new_fd);
78 
79     }
80     close(sockfd);
81    // exit(0);
82     return 0;
83 }

linux 下tcp client, ./tcpclient localhost 8001 或者 ./tcpclient 127.0.0.1 8001

 1 #include<stdlib.h>
 2 #include<stdio.h>
 3 #include<string.h>
 4 #include<netdb.h>
 5 #include<sys/types.h>
 6 #include<netinet/in.h>
 7 #include<sys/socket.h>
 8 #include<unistd.h>
 9 #include<arpa/inet.h>
10 #include<errno.h>
11 
12 int main(int argc,char *argv[])
13 {
14     int sockfd;
15     int i = 0;
16     int temp = 0;
17     char sendbuffer[200];
18     char recvbuffer[200];
19     char buffer[1024];
20     struct sockaddr_in server_addr;
21     struct hostent *host;
22     int portnumber,nbytes;
23     if(argc!=3)
24     {
25         fprintf(stderr,"Usage :%s hostname portnumbera
",argv[0]);
26         exit(1);
27     }
28     if((host=gethostbyname(argv[1]))==NULL)
29     {
30         herror("Get host name error
");
31         exit(1);
32     }
33     if((portnumber=atoi(argv[2]))<0)
34     {
35         fprintf(stderr,"Usage:%s hostname portnumbera
",argv[0]);
36         exit(1);
37     }
38 
39     while (1)
40     {
41     if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
42     {
43         fprintf(stderr,"Socket Error:%sa
",strerror(errno));
44         exit(1);
45     }
46     bzero(&server_addr,sizeof(server_addr));
47     server_addr.sin_family=AF_INET;
48     server_addr.sin_port=htons(portnumber);
49     server_addr.sin_addr=*((struct in_addr *)host->h_addr);
50     
51 
52         if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
53         {
54             fprintf(stderr,"Connect error:%s
",strerror(errno));
55             //exit(1);
56         }
57 /*      while(1)
58         {
59             printf("Please input your word:
");
60             scanf("%s",sendbuffer);
61             printf("
");
62             if(strcmp(sendbuffer,"quit")==0)
63                 break;
64             send(sockfd,sendbuffer,sizeof(sendbuffer),0);
65             recv(sockfd,recvbuffer,200,0);
66             printf("recv data of my world is :%s
",recvbuffer);
67         } */
68 //        sleep(3);
69         if((nbytes = recv(sockfd, buffer, 1024, 0)) == -1)
70         {
71             fprintf(stderr,"read error:%s
",strerror(errno));
72             //exit(1);
73         }
74         else
75         {
76 //            buffer[nbytes] = '';
77 //            printf("I have received:%s
", buffer);
78             for(i = 0; i < nbytes; i++)
79             {
80                 temp = buffer[i];
81                 //temp = temp & 0x000000FF;
82                 printf("%02X ", temp);
83             }
84             printf("
");
85         }
86         sleep(3);
87         close(sockfd);
88     }
89     exit(0);
90 }