最简单的Socket通讯

 这是最简单了的Socket通讯了，因为只有客户端可以向服务端程序发送消息，不能接受消息。而服务端只能够接受消息，不能够发送消息。

  #######################

  server

 #######################

  #include<sys/socket.h>
#include<netinet/in.h>
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
int main()
   {
       int admin_socket,data_socket;
       struct sockaddr_in name;
       char buf[1024];
       int  nbyte,i;
       admin_socket=socket(AF_INET,SOCK_STREAM,0);
       if(admin_socket<0)
           printf("*********Error******");
       name.sin_family=AF_INET;
       name.sin_addr.s_addr=INADDR_ANY;
       name.sin_port=htons(12345);
       if(bind(admin_socket,(struct sockaddr*)&name,sizeof(name))<0)
            printf("*******Blind error********");
       if(listen(admin_socket,5)<0)
            printf("******Listen error********");
       if((data_socket=accept(admin_socket,0,0))<0)
            printf("******Connet refused*********");
       else
            printf("Connet data_socket=%d",data_socket);
       for(;;)
         {
           nbyte=read(data_socket,buf,1086);
           if(nbyte==0)
               {
                   printf("*********Falied********/n");
                   close(data_socket);
                   exit(0);
               }
           for(i=0;i<nbyte;i++)
               printf("%c",buf[i]);
           printf("\n");
         }
             
   }

 

 

#######################

client.c

######################

#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
int main (int argc ,char **argv)
{
   int sock;
   struct sockaddr_in name;
   char sbuf[1086];
   if(argc<2)
     {
         printf("<<<<<<<<22222222");
         exit(0);
      }
    sock=socket(AF_INET,SOCK_STREAM,0);
    if(sock<0)
        printf("*****Error******");

    name.sin_family=AF_INET;
    name.sin_addr.s_addr=htonl(inet_network(argv[1]));
    name.sin_port=htons(12345);
    if(connect(sock,(struct sockaddr*)&name,sizeof(name))==-1)
      {
          printf("*******Connect failed*******");
           exit(1);
       }
    printf("******Connected********");
    for(;;)
      {
         if(fgets(sbuf,1086,stdin)==NULL) break;
         if(write(sock,sbuf,strlen(sbuf))<0)
             {
                printf("sending message error!\n");
                close(sock);
                printf("connection closed!\n");
                exit(0);
              }
       }
    return 1;
}

 

   分别用两个终端编译执行客户端和服务端。在客户端输入Ip本地为：127.0.0.1之后，就可以通讯了。稍复杂的请见：http://blog.youkuaiyun.com/yilip/article/details/7705462