自学教程：C++ GetTimeZoneInformation函数代码示例

void Timer_Calibrate::OnBnClickedOk(){    // TODO: 在此添加控件通知处理程序代码    //OnOK();    KILLTIMER;    had_select=false;    UpdateData(true);    unsigned char t_time[8]= {0};    unsigned short temp_us=0;    temp_us=m_date_time.GetYear();    t_time[0]=temp_us/100;    t_time[1]=temp_us%100;    t_time[2]=m_date_time.GetMonth();    t_time[3]=m_date_time.GetDayOfWeek();// 	if(t_time[3]==1)// 		t_time[3]=6;// 	else// 		t_time[3]-=2;    if(t_time[3]==1)        t_time[3]=7;    else        t_time[3]-=1;    t_time[4]=m_date_time.GetDay();    t_time[5]=m_time_time.GetHour();    t_time[6]=m_time_time.GetMinute();    t_time[7]=m_time_time.GetSecond();    Write_Multi(g_tstat_id,t_time,200,8);    int t=_wtoi(m_time_zone.Right(m_time_zone.GetLength()-1));    if(m_time_zone.Left(1)=="+")        t+=12;    else        t=12-t;    write_one(g_tstat_id,11,t);    Read_Multi(g_tstat_id,machine_time,200,8,3);    if(machine_time[1]<10)        m_machine_time.Format(_T("   %d/%d/%d0%d %d:%d:%d"),machine_time[2],machine_time[4],machine_time[0],machine_time[1],machine_time[5],machine_time[6],machine_time[7]);    else        m_machine_time.Format(_T("   %d/%d/%d%d %d:%d:%d"),machine_time[2],machine_time[4],machine_time[0],machine_time[1],machine_time[5],machine_time[6],machine_time[7]);    if(machine_time[5]>12)        m_machine_time+=_T(" PM");    else        m_machine_time+=_T(" AM");    m_NCDateCtrl.SetDate(machine_time[0]*100+machine_time[1],machine_time[2],machine_time[4]);    m_NCTimeCtrl.SetTime(machine_time[5],machine_time[6],machine_time[7]);    if(had_select==false)        m_time_time=m_time_time.GetCurrentTime();    TIME_ZONE_INFORMATION temp;    GetTimeZoneInformation(&temp);    m_time_zone_str=temp.StandardName;    int i_temp=read_one(g_tstat_id,11);    if(temp.Bias>0)    {        m_time_zone=_T("-");        CString t;        t.Format(_T("%d"),temp.Bias/60);        m_time_zone=m_time_zone+t;        if(i_temp==255)        {            m_building_time_zone.SetCurSel(12-temp.Bias/60);            write_one(g_tstat_id,11,(short)(12-temp.Bias/60));        }        else if(i_temp>=0)            m_building_time_zone.SetCurSel(i_temp);    }    else    {        m_time_zone=_T("+");        CString t;        t.Format(_T("%d"),temp.Bias/-60);        m_time_zone=m_time_zone+t;        if(i_temp==255)        {            m_building_time_zone.SetCurSel(12-temp.Bias/60);            write_one(g_tstat_id,11,(short)(12-temp.Bias/60));        }        else if(i_temp>=0)            m_building_time_zone.SetCurSel(i_temp);    }    UpdateData(FALSE);    SETTIMER;}

void__gnat_localtime_tzoff (const time_t *timer, const int *is_historic, long *off){  TIME_ZONE_INFORMATION tzi;  BOOL  rtx_active;  DWORD tzi_status;#ifdef RTX  rtx_active = 1;#else  rtx_active = 0;#endif  (*Lock_Task) ();  tzi_status = GetTimeZoneInformation (&tzi);  /* Processing for RTX targets or cases where we simply want to extract the     offset of the current time zone, regardless of the date. */  if (rtx_active || !is_historic) {    *off = tzi.Bias;    /* The system is operating in the range covered by the StandardDate       member. */    if (tzi_status == TIME_ZONE_ID_STANDARD) {       *off = *off + tzi.StandardBias;    }    /* The system is operating in the range covered by the DaylightDate       member. */    else if (tzi_status == TIME_ZONE_ID_DAYLIGHT) {       *off = *off + tzi.DaylightBias;    }    *off = *off * -60;  }  /* Time zone offset calculations for a historic or future date */  else {    union    {      FILETIME ft_time;      unsigned long long ull_time;    } utc_time, local_time;    SYSTEMTIME utc_sys_time, local_sys_time;    BOOL status;    /* First convert unix time_t structure to windows FILETIME format.  */    utc_time.ull_time = ((unsigned long long) *timer + w32_epoch_offset)                        * 10000000ULL;    /* If GetTimeZoneInformation does not return a value between 0 and 2 then       it means that we were not able to retrieve timezone informations. Note       that we cannot use here FileTimeToLocalFileTime as Windows will use in       always in this case the current timezone setting. As suggested on MSDN       we use the following three system calls to get the right information.       Note also that starting with Windows Vista new functions are provided       to get timezone settings that depend on the year. We cannot use them as       we still support Windows XP and Windows 2003.  */    status = (tzi_status >= 0 && tzi_status <= 2)      && FileTimeToSystemTime (&utc_time.ft_time, &utc_sys_time)      && SystemTimeToTzSpecificLocalTime (&tzi, &utc_sys_time, &local_sys_time)      && SystemTimeToFileTime (&local_sys_time, &local_time.ft_time);    /* An error has occured, return invalid_tzoff */    if (!status) {      *off = __gnat_invalid_tzoff;    }    else {      if (local_time.ull_time > utc_time.ull_time) {        *off = (long) ((local_time.ull_time - utc_time.ull_time)               / 10000000ULL);      }      else {        *off = - (long) ((utc_time.ull_time - local_time.ull_time)               / 10000000ULL);      }    }  }  (*Unlock_Task) ();}

/********************************************************************* *      GetDaylightFlag                                   ([email
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