ioclient.c~

linux下实现IO通信

#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define PORT 		1234
#define MAXDATASIZE	1000

int main(int argc, char *argv[])
{
	int fd, num;
	char buf[MAXDATASIZE];
//	struct hostent *he;
	struct sockaddr_in server;
	if (argc != 2)
	{
		printf("Usage: %s  <IP address>\n", argv[0]);
		exit(-1);
	}

/*if ((he = gethostbyname(argv[1])) == NULL) {
		perror("gethostbyname error.");
		exit(1);
	}*/

	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("Create socket failed.");
		exit(1);
	}

	bzero(&server, sizeof(server));
	server.sin_family = AF_INET;
	server.sin_port = htons(PORT);
	server.sin_addr.s_addr = inet_addr(argv[1]);
//	server.sin_addr = *((struct in_addr *) he->h_addr);
	if (connect(fd, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1) {
		perror("Connect failed");
		exit(1);
	}
    
	char sendline[MAXDATASIZE];
	scanf("%s", sendline);
	send(fd, sendline, MAXDATASIZE, 0);
    

	if((num = recv(fd, buf, MAXDATASIZE, 0)) == -1)  {
		perror("recv error.");
		exit(1);
	}

	buf[num] = '\0';
	printf("Server Message: %s\n", buf);

	close(fd);
}