broadcast-client.c

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/* ------
client 
------------*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>

int main(int argc, char* argv[])
{
	int						msock;
	struct	sockaddr_in		msin;
	int						msinlen = sizeof(msin);
	int						PORT = 5150;
	char					buf[64];
	char *					hostname = 0;
	unsigned long			iaddr;
	struct hostent *		host;


	// 命令行参数检查
	// 如果提供了目的端口，使用它
	if (argc > 2) 
		PORT = atoi(argv[2]);		

	// 如果提供目的主机，使用它，否则本机
	if (argc > 1) 
		hostname = argv[1];
	else 
		hostname = "localhost";
	


	// 填充服务器的地址结构
	// 让用户即可以输入机器名，也可以是IP
	memset(&msin, 0, msinlen);
	iaddr = inet_addr(hostname);
	if (iaddr == INADDR_NONE)
	{
		host = gethostbyname(hostname);
		if (host == NULL) {
			perror("gethostbyname() failed");
			exit(-1);
		}
		memcpy(&(msin.sin_addr), host->h_addr, host->h_length);
	}
	else {
		//memcpy(&(msin.sin_addr), (struct in_addr *) & iaddr, sizeof(iaddr));
		msin.sin_addr.s_addr = iaddr;
	}
	msin.sin_family = AF_INET;
	msin.sin_port = htons(PORT);




	// 创建套接字描述符
	msock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	fprintf(stdout, "Client will connect to %s:%d.\n", 
		inet_ntoa(msin.sin_addr), PORT);


	// 发出到服务器的连接
	if (connect(msock, (struct sockaddr *)&msin, msinlen) <0){
		perror("连接服务器失败");
		return -1;
	}
	fprintf(stdout, "Client connect to server succeed.\n");
	

	// 接收服务器传来的数据
	memset(buf, 0, sizeof(buf));
	read(msock, buf, sizeof(buf));
	fprintf(stdout, "Client get from server the time:%s\n", buf);


	close(msock);
	getchar();
return 0;
}