client1.c

linux系统下

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

int main()
{
	int sockfd;
	int len;
	struct sockaddr_in address;
	int result;
	char ch = 'A';
	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	//printf("the client socket id is %d\n",sockfd);
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = inet_addr("127.0.0.1");
	address.sin_port = htons(9734);
	len = sizeof(address);

	result = connect (sockfd, (struct sockaddr *)&address, len);

	if (result ==-1)
	{
		perror("oops:client2\n");
		exit(1);
	}
	write(sockfd, &ch, 1);
	read(sockfd, &ch, 1);
	printf("char from server = %c\n",ch);
	close(sockfd);
	exit(0);
}