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The offset in this case if 114, not -114. """ resource = self.p_wchar() lpBuffer = ctypes.cast(ctypes.byref(resource), wintypes.LPWSTR) nchar = self.LoadStringW(self._tzres._handle, offset, lpBuffer, 0) return resource[:nchar] def name_from_string(self, tzname_str): """ Parse strings as returned from the Windows registry into the time zone name as defined in the registry. >>> from dateutil.tzwin import tzres >>> tzr = tzres() >>> print(tzr.name_from_string('@tzres.dll,-251')) 'Dateline Daylight Time' >>> print(tzr.name_from_string('Eastern Standard Time')) 'Eastern Standard Time' :param tzname_str: A timezone name string as returned from a Windows registry key. :return: Returns the localized timezone string from tzres.dll if the string is of the form `@tzres.dll,-offset`, else returns the input string. """ if not tzname_str.startswith('@'): return tzname_str name_splt = tzname_str.split(',-') try: offset = int(name_splt[1]) except: raise ValueError("Malformed timezone string.") return self.load_name(offset) class tzwinbase(tzrangebase): """tzinfo class based on win32's timezones available in the registry.""" def __init__(self): raise NotImplementedError('tzwinbase is an abstract base class') def __eq__(self, other): # Compare on all relevant dimensions, including name. if not isinstance(other, tzwinbase): return NotImplemented return (self._std_offset == other._std_offset and self._dst_offset == other._dst_offset and self._stddayofweek == other._stddayofweek and self._dstdayofweek == other._dstdayofweek and self._stdweeknumber == other._stdweeknumber and self._dstweeknumber == other._dstweeknumber and self._stdhour == other._stdhour and self._dsthour == other._dsthour and self._stdminute == other._stdminute and self._dstminute == other._dstminute and self._std_abbr == other._std_abbr and self._dst_abbr == other._dst_abbr) @staticmethod def list(): """Return a list of all time zones known to the system.""" with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle: with winreg.OpenKey(handle, TZKEYNAME) as tzkey: result = [winreg.EnumKey(tzkey, i) for i in range(winreg.QueryInfoKey(tzkey)[0])] return result def display(self): return self._display def transitions(self, year): """ For a given year, get the DST on and off transition times, expressed always on the standard time side. For zones with no transitions, this function returns ``None``. :param year: The year whose transitions you would like to query. :return: Returns a :class:`tuple` of :class:`datetime.datetime` objects, ``(dston, dstoff)`` for zones with an annual DST transition, or ``None`` for fixed offset zones. """ if not self.hasdst: return None dston = picknthweekday(year, self._dstmonth, self._dstdayofweek, self._dsthour, self._dstminute, self._dstweeknumber) dstoff = picknthweekday(year, self._stdmonth, self._stddayofweek, self._stdhour, self._stdminute, self._stdweeknumber) # Ambiguous dates default to the STD side dstoff -= self._dst_base_offset return dston, dstoff def _get_hasdst(self): return self._dstmonth != 0 @property def _dst_base_offset(self): return self._dst_base_offset_ class tzwin(tzwinbase): def __init__(self, name): self._name = name # multiple contexts only possible in 2.7 and 3.1, we still support 2.6 with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle: tzkeyname = text_type("{kn}\\{name}").format(kn=TZKEYNAME, name=name) with winreg.OpenKey(handle, tzkeyname) as tzkey: keydict = valuestodict(tzkey) self._std_abbr = keydict["Std"] self._dst_abbr = keydict["Dlt"] self._display = keydict["Display"] # See http://ww_winreg.jsiinc.com/SUBA/tip0300/rh0398.htm tup = struct.unpack("=3l16h", keydict["TZI"]) stdoffset = -tup[0]-tup[1] # Bias + StandardBias * -1 dstoffset = stdoffset-tup[2] # + DaylightBias * -1 self._std_offset = datetime.timedelta(minutes=stdoffset) self._dst_offset = datetime.timedelta(minutes=dstoffset) # for the meaning see the win32 TIME_ZONE_INFORMATION structure docs # http://msdn.microsoft.com/en-us/library/windows/desktop/ms725481(v=vs.85).aspx (self._stdmonth, self._stddayofweek, # Sunday = 0 self._stdweeknumber, # Last = 5 self._stdhour, self._stdminute) = tup[4:9] (self._dstmonth, self._dstdayofweek, # Sunday = 0 self._dstweeknumber, # Last = 5 self._dsthour, self._dstminute) = tup[12:17] self._dst_base_offset_ = self._dst_offset - self._std_offset self.hasdst = self._get_hasdst() def __repr__(self): return "tzwin(%s)" % repr(self._name) def __reduce__(self): return (self.__class__, (self._name,)) class tzwinlocal(tzwinbase): def __init__(self): with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle: with winreg.OpenKey(handle, TZLOCALKEYNAME) as tzlocalkey: keydict = valuestodict(tzlocalkey) self._std_abbr = keydict["StandardName"] self._dst_abbr = keydict["DaylightName"] try: tzkeyname = text_type('{kn}\\{sn}').format(kn=TZKEYNAME, sn=self._std_abbr) with winreg.OpenKey(handle, tzkeyname) as tzkey: _keydict = valuestodict(tzkey) self._display = _keydict["Display"] except OSError: self._display = None stdoffset = -keydict["Bias"]-keydict["StandardBias"] dstoffset = stdoffset-keydict["DaylightBias"] self._std_offset = datetime.timedelta(minutes=stdoffset) self._dst_offset = datetime.timedelta(minutes=dstoffset) # For reasons unclear, in this particular key, the day of week has been # moved to the END of the SYSTEMTIME structure. tup = struct.unpack("=8h", keydict["StandardStart"]) (self._stdmonth, self._stdweeknumber, # Last = 5 self._stdhour, self._stdminute) = tup[1:5] self._stddayofweek = tup[7] tup = struct.unpack("=8h", keydict["DaylightStart"]) (self._dstmonth, self._dstweeknumber, # Last = 5 self._dsthour, self._dstminute) = tup[1:5] self._dstdayofweek = tup[7] self._dst_base_offset_ = self._dst_offset - self._std_offset self.hasdst = self._get_hasdst() def __repr__(self): return "tzwinlocal()" def __str__(self): # str will return the standard name, not the daylight name. return "tzwinlocal(%s)" % repr(self._std_abbr) def __reduce__(self): return (self.__class__, ()) def picknthweekday(year, month, dayofweek, hour, minute, whichweek): """ dayofweek == 0 means Sunday, whichweek 5 means last instance """ first = datetime.datetime(year, month, 1, hour, minute) # This will work if dayofweek is ISO weekday (1-7) or Microsoft-style (0-6), # Because 7 % 7 = 0 weekdayone = first.replace(day=((dayofweek - first.isoweekday()) % 7) + 1) wd = weekdayone + ((whichweek - 1) * ONEWEEK) if (wd.month != month): wd -= ONEWEEK return wd def valuestodict(key): """Convert a registry key's values to a dictionary.""" dout = {} size = winreg.QueryInfoKey(key)[1] tz_res = None for i in range(size): key_name, value, dtype = winreg.EnumValue(key, i) if dtype == winreg.REG_DWORD or dtype == winreg.REG_DWORD_LITTLE_ENDIAN: # If it's a DWORD (32-bit integer), it's stored as unsigned - convert # that to a proper signed integer if value & (1 << 31): value = value - (1 << 32) elif dtype == winreg.REG_SZ: # If it's a reference to the tzres DLL, load the actual string if value.startswith('@tzres'): tz_res = tz_res or tzres() value = tz_res.name_from_string(value) value = value.rstrip('\x00') # Remove trailing nulls dout[key_name] = value return dout