client.c

面向连接的Socket实例: 代码实例中的服务器通过socket连接向客户端发送字符串"Hello, you are connected!"。只要在服务 器上运行该服务器软件

/*
*
*	socket client
*
*/


#include  <stdio.h>
#include  <netdb.h>
#include  <sys/socket.h>
#include  <netinet/in.h>

/*
#include	<time.h>
*/

#define SERVPORT 9800 
#define MAXDATASIZE 100 /*每次最大数据传输量 */ 

main(int argc, char *argv[])
{

	int sockfd, recvbytes;
	char buf[MAXDATASIZE];
	struct hostent *host;
	struct sockaddr_in serv_addr;

	time_t	tt;

	/*
	if (argc < 2) {
		fprintf(stderr,"Please enter the server's hostname!n");
		exit(1);
	}
	if((host=gethostbyname(argv[1]))==NULL) {
		herror("gethostbyname出错！");
		exit(1);
	}
	*/


	host=gethostbyname("10.179.89.150");

	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
		perror("socket创建出错！");
		exit(1);
	}
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_port=htons(SERVPORT);
	serv_addr.sin_addr = *((struct in_addr *)host->h_addr); 
	bzero(&(serv_addr.sin_zero),8);

	if (connect(sockfd, (struct sockaddr *)&serv_addr,  
	    	sizeof(struct sockaddr)) == -1) {
		perror("connect出错！");
		exit(1);
	}

	time( &tt );    printf("CLIENT receive at  %s\n", ctime( &tt ));

	if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) ==-1) {
		perror("recv出错！");
		time( &tt );    printf("CLIENT receive err at  %s\n", ctime( &tt ));
		exit(1);
	}

	time( &tt );    printf("CLIENT receive over at  %s\n", ctime( &tt ));
	printf( "CLIENT recv [%s]!\n", buf);

	close( sockfd );

	return 0;
}