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Add functions to enumerate keys and delete values

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Kovid Goyal 2015-02-17 22:32:12 +05:30
parent 589baf7b5d
commit ef50eca37c
1 changed files with 38 additions and 1 deletions
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39
src/calibre/utils/winreg/lib.py
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@ -6,7 +6,7 @@
__license__ = 'GPL v3'
__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
import ctypes, ctypes.wintypes as types, _winreg as winreg, struct
import ctypes, ctypes.wintypes as types, _winreg as winreg, struct, datetime
import winerror, win32con
# Binding to C library {{{
@ -131,6 +131,20 @@ def convert_registry_data(raw, size, dtype):
RegDeleteTree = cwrap(
'RegDeleteTreeW', LONG, a('key', HKEY), a('sub_key', LPCWSTR, None))
RegDeleteKeyValue = cwrap(
'RegDeleteKeyValueW', LONG, a('key', HKEY), a('sub_key', LPCWSTR, None), a('name', LPCWSTR, None))
RegEnumKeyEx = cwrap(
'RegEnumKeyExW', LONG, a('key', HKEY), a('index', DWORD), a('name', LPWSTR), a('name_size', LPDWORD), a('reserved', LPDWORD, None),
a('cls', LPWSTR, None), a('cls_size', LPDWORD, None), a('last_write_time', ctypes.POINTER(FILETIME), in_arg=False),
errcheck=enum_value_errcheck)
def filetime_to_datettime(ft):
timestamp = ft.dwHighDateTime
timestamp <<= 32
timestamp |= ft.dwLowDateTime
return datetime.datetime(1601, 1, 1, 0, 0, 0) + datetime.timedelta(microseconds=timestamp/10)
# }}}
class Key(object):
@ -145,6 +159,27 @@ def __init__(self, create_at=None, open_at=None, root=HKEY_CURRENT_USER, open_mo
else:
self.hkey = HKEY()
def iterkeynames(self, get_last_write_times=False):
' Iterate over the names of all keys in this key '
name_buf = ctypes.create_unicode_buffer(1024)
lname_buf = DWORD(len(name_buf))
i = 0
while True:
lname_buf.value = len(name_buf)
try:
file_time = RegEnumKeyEx(self.hkey, i, name_buf, ctypes.byref(lname_buf))
except ValueError:
raise RuntimeError('Enumerating keys failed with buffer too small, which should never happen')
if get_last_write_times:
yield name_buf.value[:lname_buf.value], filetime_to_datettime(file_time)
else:
yield name_buf.value[:lname_buf.value]
i += 1
def delete_value(self, sub_key=None, name=None):
' Delete the named value from this key. If name is None the default value is deleted. '
RegDeleteKeyValue(self.hkey, sub_key, name)
def delete_tree(self, sub_key=None):
''' Delete this key and all its children. Note that a key is not
actually deleted till the last handle to it is closed. '''
@ -237,4 +272,6 @@ def __del__(self):
k.set_default_value(r'other\key', '%PATH%', has_expansions=True)
pprint(tuple(k.itervalues(get_data=True)))
k.set_default_value(r'delete\me\please', 'xxx')
pprint(tuple(k.iterkeynames(get_last_write_times=True)))
k.delete_tree('delete')
pprint(tuple(k.iterkeynames(get_last_write_times=True)))