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// time.cpp : Defines the entry point for the console application. 
// 
 
 
// client.cpp : Defines the entry point for the console application. 
// 
 
#include "stdafx.h" 
#include "winsock.h" 
#include "stdlib.h" 
 
void usage(char *name) 
{ 
	fprintf(stderr, "usage: %s [ip [port]]\n", name); 
} 
 
int main(int argc,char *argv[]) 
{ 
	SOCKET sock; 
	struct sockaddr_in sa; 
	int err; 
	int servport = 5555; /* 默认去连接的端口 */ 
	char buff[256]; /* 存放服务端返回的信息 */ 
	WSADATA wsd; 
	unsigned long uladdr; /* 转换后的服务器地址 */ 
	printf("************************************************************\n"); 
	printf("*time client sample,written by suyu,chenyu\n"); 
	printf("*mail:webants@163.com                    \n"); 
	printf("************************************************************\n"); 
	if (argc > 3 || argc < 2) { 
		usage(argv[0]); 
		return -1; 
	} 
 
	if (argc > 1) { 
		uladdr = inet_addr(argv[1]); 
		if (uladdr == INADDR_NONE) { 
			usage(argv[0]); 
			return -1; 
		} 
	} 
 
	if (argc == 3) { 
		servport = atoi(argv[2]); 
		if (servport > 65535 || servport < 1) { /* 如不是合法端口，则退出*/ 
			usage(argv[0]); 
			return -2; 
		} 
	} 
 
	/* 初始化Winsock1.1 */ 
	if (WSAStartup(MAKEWORD(1,1), &wsd) != 0) { 
		printf("WSAStartup() failed !\n"); 
		return -3; 
	} 
 
	/* 创建连接套接字 */ 
	printf("create socket ...\n"); 
	sock = socket(AF_INET, SOCK_STREAM, 0); 
	if (sock == INVALID_SOCKET) { 
		fprintf(stderr, "socket() failed: %d\n", WSAGetLastError()); 
		return -4; 
	} 
	printf("[OK]\n"); 
 
	/* 填充要连接的服务器地址结构 */ 
	memset(&sa, 0, sizeof(sa)); 
	sa.sin_family			= AF_INET; 
	sa.sin_port				= htons(servport); 
	sa.sin_addr.S_un.S_addr	= uladdr; 
 
	/* 连接服务器 */ 
	printf("connect ...\n"); 
	err = connect(sock, (const sockaddr *)&sa,sizeof(sa)); 
	if (err != 0) { 
		fprintf(stderr, "connect() failed: %d\n", WSAGetLastError()); 
		return -5; 
	} 
	printf("[OK]\n"); 
 
	/* 接收返回的时间/日期信息 */ 
	printf("recv data ...\n"); 
	memset(buff, 0, sizeof(buff)); 
	if (recv(sock, buff, sizeof(buff), 0) == SOCKET_ERROR) { 
		fprintf(stderr, " recv error !\n"); 
		return -1; 
	} 
	printf("[OK]\n"); 
 
/* 输出返回的信息 */ 
	printf("Server Date/time : \n%s\n", buff); 
	 
	closesocket(sock); /* 关闭连接套接字 */ 
	WSACleanup(); /* 释放资源 */ 
	return 0; 
}