gettimeofday在VS上的实现

gettimeofday是Linux上的函数,使用方法如下

#include <sys/time.h>
const char* srs_human_format_time()
{
struct timeval tv;
static char buf[23];
memset(buf, 0, sizeof(buf));
// clock time
if (gettimeofday(&tv, NULL) == -1) {
return buf;
}
// to calendar time
struct tm* tm;
if ((tm = localtime((const time_t*)&tv.tv_sec)) == NULL) {
return buf;
}
snprintf(buf, sizeof(buf),
"%d-%02d-%02d %02d:%02d:%02d.%03d",
1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec,
(int)(tv.tv_usec / 1000));
buf[sizeof(buf) - 1] = 0;
return buf;
}

该函数返回如 2018-02-25 09:32:11 的格式化时间字符串

而 sys/time.h 只是在linux系统上可以调用，在vs2010中：

#include <WinSock.h>
#define SECS_TO_FT_MULT 10000000
static LARGE_INTEGER base_time;
typedef struct win_time_val
{
/** The seconds part of the time. */
long
sec;
/** The miliseconds fraction of the time. */
long
msec;
} win_time_val_t;
typedef struct win_time
{
/** This represents day of week where value zero means Sunday */
int wday;
/** This represents day of month: 1-31 */
int day;
/** This represents month, with the value is 0 - 11 (zero is January) */
int mon;
/** This represent the actual year (unlike in ANSI libc where
*
the value must be added by 1900).
*/
int year;
/** This represents the second part, with the value is 0-59 */
int sec;
/** This represents the minute part, with the value is: 0-59 */
int min;
/** This represents the hour part, with the value is 0-23 */
int hour;
/** This represents the milisecond part, with the value is 0-999 */
int msec;
}win_time_t;
// Find 1st Jan 1970 as a FILETIME
static void get_base_time(LARGE_INTEGER *base_time)
{
SYSTEMTIME st;
FILETIME ft;
memset(&st,0,sizeof(st));
st.wYear=1970;
st.wMonth=1;
st.wDay=1;
SystemTimeToFileTime(&st, &ft);
base_time->LowPart = ft.dwLowDateTime;
base_time->HighPart = ft.dwHighDateTime;
base_time->QuadPart /= SECS_TO_FT_MULT;
}
int win_gettimeofday(win_time_val_t *tv)
{
SYSTEMTIME st;
FILETIME ft;
LARGE_INTEGER li;
static char get_base_time_flag=0;
if (get_base_time_flag == 0)
{
get_base_time(&base_time);
}
/* Standard Win32 GetLocalTime */
GetLocalTime(&st);
SystemTimeToFileTime(&st, &ft);
li.LowPart = ft.dwLowDateTime;
li.HighPart = ft.dwHighDateTime;
li.QuadPart /= SECS_TO_FT_MULT;
li.QuadPart -= base_time.QuadPart;
tv->sec = li.LowPart;
tv->msec = st.wMilliseconds;
return 0;
}
int win_time(const win_time_val_t *tv, win_time_t *time)
{
LARGE_INTEGER li;
FILETIME ft;
SYSTEMTIME st;
li.QuadPart = tv->sec;
li.QuadPart += base_time.QuadPart;
li.QuadPart *= SECS_TO_FT_MULT;
ft.dwLowDateTime = li.LowPart;
ft.dwHighDateTime = li.HighPart;
FileTimeToSystemTime(&ft, &st);
time->year = st.wYear;
time->mon = st.wMonth-1;
time->day = st.wDay;
time->wday = st.wDayOfWeek;
time->hour = st.wHour;
time->min = st.wMinute;
time->sec = st.wSecond;
time->msec = tv->msec;
return 0;
}
const char* srs_human_format_time()
{
static char buf[23];
memset(buf, 0, sizeof(buf));
win_time_val_t wintv;
win_time_t wintime;
win_gettimeofday(&wintv);
win_time(&wintv,&wintime);
_snprintf(buf,sizeof(buf),"%d-%d-%d %d:%d:%d",
wintime.year,wintime.mon+1,wintime.day,
wintime.hour,wintime.min,wintime.sec);
buf[sizeof(buf) - 1] = 0;
return buf;
}

最后在main方法里：

printf("%s", srs_human_format_time());

最后

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