inux下gettimeofday函数windows替换方法(详解)

实例如下：

#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

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