linux下gettimeofday函数windows替换方案

最新推荐文章于 2023-03-30 21:53:21 发布

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最新推荐文章于 2023-03-30 21:53:21 发布

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本文介绍了一个用于获取Windows系统当前时间的C++函数实现，包括从系统时间到结构体时间值的转换。

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链接：http://blog.sina.com.cn/s/blog_48526a5f0100iqyn.html

#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

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "gettimewin.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";

        struct tm *newtime;
        char log_name[128];
        char log_time[128];
        time_t lt;
        time(&lt);
        newtime = localtime(&lt);
        strftime( log_name, 128, "%Y%m%d", newtime);
        strftime( log_time,128,"%Y-%m-%d %H:%M:%S",newtime);

  printf("%s\n", log_name);
  printf("%s\n", log_time);

    (void)gettimeofday(&tv, 0);
newtime = localtime(&(time_t(tv.tv_sec)));
    (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);
}