Windows系統呼叫getimeofday，會返回-1錯誤。可以編寫一個函式替代該函式

#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