我用VC++2008，想问为什么找不到

/*-

 * Copyright (C) 2008 mymtom (mymtom@hotmail.com)

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * $Id: src/lib/libtrace/gettimeofday.c,v 1.1 2008/03/28 12:08:44 mymtom Exp $

 */



#include <time.h>

#ifdef WIN32

#   include <windows.h>

#else

#   include <sys/time.h>

#endif



#ifdef WIN32

int

gettimeofday(struct timeval *tp, void *tzp)

{

	time_t clock;

	struct tm tm;

	SYSTEMTIME wtm;



	GetLocalTime(&wtm);

	tm.tm_year 	= wtm.wYear - 1900;

	tm.tm_mon 	= wtm.wMonth - 1;

	tm.tm_mday 	= wtm.wDay;

	tm.tm_hour 	= wtm.wHour;

	tm.tm_min 	= wtm.wMinute;

	tm.tm_sec 	= wtm.wSecond;

	tm. tm_isdst	= -1;

	clock = mktime(&tm);

	tp->tv_sec = clock;

	tp->tv_usec = wtm.wMilliseconds * 1000;



	return (0);

}

#endif /* WIN32 */

#include <stdio.h>

#include <stdlib.h>



#include <time.h>

#ifdef WIN32

#   include <windows.h>

#else

#   include <sys/time.h>

#endif



int	 gettimeofday(struct timeval *tp, void *tzp);



#if defined(_MSC_VER) && !defined(snprintf)

#define  snprintf  _snprintf

#endif



int main(int argc, char *argv[])

{

	struct timeval	 tv;

	char		 buf[] = "1970-01-01 00:00:00.000";



	(void)gettimeofday(&tv, 0);	

	(void)strftime(buf, sizeof(buf) - 1, "%Y-%m-%d %H:%M:%S.000",

	    (localtime(&tv.tv_sec)));

	(void)snprintf(buf + 20, 3, "%03d", (int)(tv.tv_usec / 1000));

	(void)printf("%s\n", buf);



	return (0);

}

gettimeofday 是unix/linux上的

windows上用



timeGetTime

或者

GetTickCount

之类的吧，



自己google下