SysMonthCal32 выделение дней

#define BOLDDAY(ds,iDay) if(iDay>0 && iDay<32)\
                            (ds)|=(0x00000001<<(iDay-1))

struct DayAndMonth
{
    int month;  int day;
};

...

void WinCalendar::setbolddays(DayAndMonth states[], Index count)
{
  MONTHDAYSTATE rgMonths[3] = { 0 };
  int cMonths = 3;
  for (int i = 0; i<count; i++)
  {
    BOLDDAY(rgMonths[states.month], states.day);
  }
  sendMsg(MCM_SETDAYSTATE,cMonths,(LPMONTHDAYSTATE)rgMonths);
}