client.c

通过客户机和服务器的方式来进行网络通信

/*******************************
*     ¿Í»§¶Ë³ÌÐò client.c  ¡¡  * 
********************************/ 
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
int main(int argc,char *argv[]){
int sockfd,numbytes;
char *t;
char buf[100];
struct hostent *he;
struct sockaddr_in their_addr;
int i = 0;//ת»»Ö÷»úÃû»òIPµØÖ·
he = gethostbyname(argv[1]);
t = argv[2];

//¿Í»§¶Ë³ÌÐòœšÁ¢TCPЭÒéµÄsockedÌלÓ×ÖÃèÊö·û
if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1){
perror("socket");
 exit(1);
}//¿Í»§¶Ë³ÌÐò³õÊŒ»¯sockaddrœá¹¹Ì壬Á¬œÓµœ·þÎñÆ÷µÄ2323¶Ë¿Ú 
their_addr.sin_family = AF_INET;
their_addr.sin_port = htons(2323);
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(their_addr.sin_zero),8);//Ïò·þÎñÆ÷·¢ÆðÁ¬œÓ 
if(connect(sockfd,(struct sockaddr *)&their_addr,sizeof(struct sockaddr))==-1){
perror("connect");
exit(1);
}
//Ïò·þÎñÆ÷·¢ËÍ×Ö·ûŽ®"hello!" 
if(send(sockfd,t,1,0)==-1){
perror("send");
exit(1);
}//œÓÊÜŽÓ·þÎñÆ÷·µ»ØµÄÐÅÏ¢
if((numbytes = recv(sockfd,buf,100,0))==-1){
perror("recv");
exit(1);
}
buf[numbytes];
printf("result:  %s   \n",buf);
/* ÍšÐÅœáÊø */
close(sockfd);
return 0;
}