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Edit File : win.py \| Size : 11.13 KB
# This code was originally contributed by Jeffrey Harris. import datetime import struct from six.moves import winreg from six import text_type try: import ctypes from ctypes import wintypes except ValueError: # ValueError is raised on non-Windows systems for some horrible reason. raise ImportError("Running tzwin on non-Windows system") from ._common import tzrangebase __all__ = ["tzwin", "tzwinlocal", "tzres"] ONEWEEK = datetime.timedelta(7) TZKEYNAMENT = r"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones" TZKEYNAME9X = r"SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones" TZLOCALKEYNAME = r"SYSTEM\CurrentControlSet\Control\TimeZoneInformation" def _settzkeyname(): handle = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) try: winreg.OpenKey(handle, TZKEYNAMENT).Close() TZKEYNAME = TZKEYNAMENT except WindowsError: TZKEYNAME = TZKEYNAME9X handle.Close() return TZKEYNAME TZKEYNAME = _settzkeyname() class tzres(object): """ Class for accessing `tzres.dll`, which contains timezone name related resources. .. versionadded:: 2.5.0 """ p_wchar = ctypes.POINTER(wintypes.WCHAR) # Pointer to a wide char def __init__(self, tzres_loc='tzres.dll'): # Load the user32 DLL so we can load strings from tzres user32 = ctypes.WinDLL('user32') # Specify the LoadStringW function user32.LoadStringW.argtypes = (wintypes.HINSTANCE, wintypes.UINT, wintypes.LPWSTR, ctypes.c_int) self.LoadStringW = user32.LoadStringW self._tzres = ctypes.WinDLL(tzres_loc) self.tzres_loc = tzres_loc def load_name(self, offset): """ Load a timezone name from a DLL offset (integer). >>> from dateutil.tzwin import tzres >>> tzr = tzres() >>> print(tzr.load_name(112)) 'Eastern Standard Time' :param offset: A positive integer value referring to a string from the tzres dll. ..note: Offsets found in the registry are generally of the form `@tzres.dll,-114`. 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 Back

Edit File : win.py | Size : 11.13 KB

# This code was originally contributed by Jeffrey Harris.
import datetime
import struct

from six.moves import winreg
from six import text_type

try:
    import ctypes
    from ctypes import wintypes
except ValueError:
    # ValueError is raised on non-Windows systems for some horrible reason.
    raise ImportError("Running tzwin on non-Windows system")

from ._common import tzrangebase

__all__ = ["tzwin", "tzwinlocal", "tzres"]

ONEWEEK = datetime.timedelta(7)

TZKEYNAMENT = r"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones"
TZKEYNAME9X = r"SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones"
TZLOCALKEYNAME = r"SYSTEM\CurrentControlSet\Control\TimeZoneInformation"

def _settzkeyname():
    handle = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE)
    try:
        winreg.OpenKey(handle, TZKEYNAMENT).Close()
        TZKEYNAME = TZKEYNAMENT
    except WindowsError:
        TZKEYNAME = TZKEYNAME9X
    handle.Close()
    return TZKEYNAME

TZKEYNAME = _settzkeyname()

class tzres(object):
    """
    Class for accessing `tzres.dll`, which contains timezone name related
    resources.

.. versionadded:: 2.5.0
    """
    p_wchar = ctypes.POINTER(wintypes.WCHAR)        # Pointer to a wide char

def __init__(self, tzres_loc='tzres.dll'):
        # Load the user32 DLL so we can load strings from tzres
        user32 = ctypes.WinDLL('user32')

# Specify the LoadStringW function
        user32.LoadStringW.argtypes = (wintypes.HINSTANCE,
                                       wintypes.UINT,
                                       wintypes.LPWSTR,
                                       ctypes.c_int)

self.LoadStringW = user32.LoadStringW
        self._tzres = ctypes.WinDLL(tzres_loc)
        self.tzres_loc = tzres_loc

def load_name(self, offset):
        """
        Load a timezone name from a DLL offset (integer).

>>> from dateutil.tzwin import tzres
        >>> tzr = tzres()
        >>> print(tzr.load_name(112))
        'Eastern Standard Time'

:param offset:
            A positive integer value referring to a string from the tzres dll.

..note:
            Offsets found in the registry are generally of the form
            `@tzres.dll,-114`. 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

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