c++ - 两个 SYSTEMTIME 变量之间的差异

Question

我想获得两个 SYSTEMTIME 变量之间的差异。我以前在这里看到有人问过这个问题，但他被告知将两个 SYSTEMTIME 结构都转换为 FILETIME..有没有其他方法来获得差异？

SYSTEMTIME st;
GetSystemTime(&st);

---这里有一些代码---

  SYSTEMTIME st2;
  GetSystemTime(&st2);

st-st2?

Answer 1

SYSTEMTIME operator-(const SYSTEMTIME& pSr,const SYSTEMTIME& pSl)
{
    SYSTEMTIME t_res;
    FILETIME v_ftime;
    ULARGE_INTEGER v_ui;
    __int64 v_right,v_left,v_res;
    SystemTimeToFileTime(&pSr,&v_ftime);
    v_ui.LowPart=v_ftime.dwLowDateTime;
    v_ui.HighPart=v_ftime.dwHighDateTime;
    v_right=v_ui.QuadPart;

    SystemTimeToFileTime(&pSl,&v_ftime);
    v_ui.LowPart=v_ftime.dwLowDateTime;
    v_ui.HighPart=v_ftime.dwHighDateTime;
    v_left=v_ui.QuadPart;

    v_res=v_right-v_left;

    v_ui.QuadPart=v_res;
    v_ftime.dwLowDateTime=v_ui.LowPart;
    v_ftime.dwHighDateTime=v_ui.HighPart;
    FileTimeToSystemTime(&v_ftime,&t_res);
    return t_res;
}