client.c

socket通信的源代码。可以直接用GCC编译.

#include <stdio.h>
#include <error.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define MYPORT 4000
#define MAXDATASIZE 100

int main(int argc,char **argv)
{
	int sockfd,numbytes;
	char buf[MAXDATASIZE];
	struct hostent *he;
	struct sockaddr_in their_addr;
/*
	if(argc != 2)
		perror("usage: a.out string");
*/
	if((sockfd = socket(AF_INET,SOCK_STREAM,0)) < 0){
		perror("socket error!");
		exit(1);
	}
	
	their_addr.sin_family = AF_INET;
	their_addr.sin_port = htons(MYPORT);
	their_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
	bzero(&(their_addr.sin_zero),8);
	
	if((connect(sockfd,(struct sockaddr *)&their_addr,
			sizeof(struct sockaddr))) == -1){
		perror("connect call error!\n");
		exit(1);
	}
	
	if( send(sockfd,"hello world!",14,0) == -1)
		perror("send call error!");
	
	close(sockfd);
	return 0;
}