client.c

linux环境下上下位机网络通讯服务器和客户端

#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;
	int i;
	struct sockaddr_in address;
	int result;
	char str[10];
	char a='a';
	for(i=0; i<10; i++)
	{
	str[i]=a;
	a++;
	}
	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = inet_addr("192.168.0.22");
	address.sin_port = 9734;
	len = sizeof(address);

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

	if (result == -1){
		perror("oops:client");
		exit(1);
	}
	write(sockfd, &str[0], 10);
	read(sockfd, &str[0], 10);
	printf("char from server = %s\n", str);
	close(sockfd);
	exit(0);
}