client.cc

unix下的一个网络查询程序

//------------Begin----------------------------------
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <signal.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <netdb.h>
#include <strings.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
	int sockfd;
	struct	sockaddr_in server;
	struct	hostent	*sun1;

	sockfd = socket(AF_INET,SOCK_STREAM,0);
	if (sockfd < 0)
	{
		printf("error open stream socket.\n");
		return 0;
	}
	server.sin_family = AF_INET;
	sun1 = gethostbyname(argv[1]);
	if (sun1 == NULL)
	{
		printf("error get host name.\n");
		return 0;
	}
	
	bcopy((char*)sun1->h_addr,(char*)&server.sin_addr,sun1->h_length);
	server.sin_port = htons(4567);
	if (connect(sockfd,(struct sockaddr *)&server,sizeof(server)) < 0) 
	{
		printf("error connect to server.\n");
		return 0;
	}
	if ((write(sockfd,"this is a test.",16))< 0)
	{
		printf("error write on stream socket.\n");
		return 0;
	}
	close(sockfd);
	return 0;
}
 //-----------End---------------------