tcpc.c

入门程序

/* tcp client  */

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<string.h>
#include	<time.h>
#include	<ctype.h>
#include	<sys/types.h>
#include	<sys/socket.h>
#include	<sys/socketvar.h>
#include	<netinet/in.h>
#include	<sys/ipc.h>
#include	<sys/msg.h>
#include	<sys/shm.h>
#include	<sys/poll.h>
#include	<sys/select.h>

#define MPORT 4951 
#define MAXSIZE 80 

int main(int argc,char *argv[])
{
	int sockfd ;
	struct sockaddr_in saddr={10,AF_INET,MPORT,0} ;
	struct sockaddr_in r_addr ;	
	struct	sockaddr *addr ;
	int addr_len ;
	int	n=0;
	char	recvs[MAXSIZE];
	size_t	len ;

	if (argc<2) 
	{
		printf("Input server IP.\n");
		exit(-1);
	}
	
	printf("  ^D to stop !!.\n");	
		
	if ((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("socket error!!\n");
		exit(-1);
	}
	
	saddr.sin_family = AF_INET ;
	saddr.sin_port = htons(MPORT) ;	
	saddr.sin_addr.s_addr = inet_addr(argv[1]) ;
/*	
	if (bind(sockfd,(struct sockaddr*)(&saddr),sizeof(struct sockaddr_in))==-1)
	{
		perror("bind error!!\n");	
		exit(-1);
	}
*/
	if (connect(sockfd,(struct sockaddr*)(&saddr),sizeof(struct sockaddr_in))<0)
	{
		perror("connect error !! \n");	
		exit(-1);
	}

	printf("Input string:");
	while(gets(recvs)!=NULL)
	{
		if ((recvs=="quit")||(recvs=="quit\n"))  exit(1); 
	
		if ((n=send(sockfd,recvs,MAXSIZE,0))==-1)
		{
			perror("send error!!\n");	
			exit(-1) ;
		}
		if ((n=recv(sockfd,recvs,sizeof(recvs),0))<=0)
		{
			perror("receive error!!\n");	
			exit(-1) ;
		}
		else
		{
			puts(recvs);
		}
		printf("Input string:");
	}
	
	close(sockfd);	
	exit(0);
}