client2.c

socket通信的源代码。可以直接用GCC编译.

/* client process, passed  */
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#define SIZE sizeof(struct sockaddr_in)
main()
{
  int sockfd; char c, rc;
  struct   sockaddr_in server={AF_INET,7000};

/*   (1) convert and store server's IP address  */
  server.sin_addr.s_addr=inet_addr("127.0.0.1");

/*   (2) setup the transport end point  */
  if ((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)  {
    printf("bind--sock call error\n");
    exit(1);
  }

/*   (3) connect the socket to the server's address */
  if (connect(sockfd,(struct sockaddr *)&server, SIZE)==-1)  {
    printf("connect --sock call error\n");
    exit(1);
  }

/*  send and receive info with the server */
	while(1){
      printf("\ninput a lower case char\n");
      c=getchar();
	  getchar();
	  if (c=='0') { printf("flag is appear,now exit\n"); break;}
      send(sockfd,&c,1,0);
      if (recv(sockfd,&c,1,0)>0)   
	  //printf("%c",c);
	  putchar(c);
	}
      close(sockfd); 
	  exit(0);
}