windows下实现gettimeofday

#include <stdio.h>#include <time.h>#include <windows.h>#define SECS_TO_FT_MULT 10000000static 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;}int main(int argc, char *argv[]){    win_time_val_t wintv;    win_time_t wintime;    win_gettimeofday(&wintv);    win_time(&wintv,&wintime);    printf("%d年%d月%d日%d时%d分%d秒%d毫秒 星期%d\r\n",            wintime.year,wintime.mon+1,wintime.day,            wintime.hour,wintime.min, wintime.sec,wintime.msec,wintime.wday);   return 0;}

本代码得于pjlib，用于日志接口实现，打印日志时间信息，精度到毫秒级

码海拾贝 date&time 后续会涉及mktime localtime  gmttime等于时间相关的api