mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
740 lines
23 KiB
ReStructuredText
740 lines
23 KiB
ReStructuredText
:mod:`winreg` -- Windows registry access
|
|
=========================================
|
|
|
|
.. module:: winreg
|
|
:platform: Windows
|
|
:synopsis: Routines and objects for manipulating the Windows registry.
|
|
.. sectionauthor:: Mark Hammond <MarkH@ActiveState.com>
|
|
|
|
|
|
These functions expose the Windows registry API to Python. Instead of using an
|
|
integer as the registry handle, a :ref:`handle object <handle-object>` is used
|
|
to ensure that the handles are closed correctly, even if the programmer neglects
|
|
to explicitly close them.
|
|
|
|
.. _exception-changed:
|
|
|
|
.. versionchanged:: 3.3
|
|
Several functions in this module used to raise a
|
|
:exc:`WindowsError`, which is now an alias of :exc:`OSError`.
|
|
|
|
.. _functions:
|
|
|
|
Functions
|
|
------------------
|
|
|
|
This module offers the following functions:
|
|
|
|
|
|
.. function:: CloseKey(hkey)
|
|
|
|
Closes a previously opened registry key. The *hkey* argument specifies a
|
|
previously opened key.
|
|
|
|
.. note::
|
|
|
|
If *hkey* is not closed using this method (or via :meth:`hkey.Close()
|
|
<PyHKEY.Close>`), it is closed when the *hkey* object is destroyed by
|
|
Python.
|
|
|
|
|
|
.. function:: ConnectRegistry(computer_name, key)
|
|
|
|
Establishes a connection to a predefined registry handle on another computer,
|
|
and returns a :ref:`handle object <handle-object>`.
|
|
|
|
*computer_name* is the name of the remote computer, of the form
|
|
``r"\\computername"``. If ``None``, the local computer is used.
|
|
|
|
*key* is the predefined handle to connect to.
|
|
|
|
The return value is the handle of the opened key. If the function fails, an
|
|
:exc:`OSError` exception is raised.
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: CreateKey(key, sub_key)
|
|
|
|
Creates or opens the specified key, returning a
|
|
:ref:`handle object <handle-object>`.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*sub_key* is a string that names the key this method opens or creates.
|
|
|
|
If *key* is one of the predefined keys, *sub_key* may be ``None``. In that
|
|
case, the handle returned is the same key handle passed in to the function.
|
|
|
|
If the key already exists, this function opens the existing key.
|
|
|
|
The return value is the handle of the opened key. If the function fails, an
|
|
:exc:`OSError` exception is raised.
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: CreateKeyEx(key, sub_key, reserved=0, access=KEY_WRITE)
|
|
|
|
Creates or opens the specified key, returning a
|
|
:ref:`handle object <handle-object>`.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*sub_key* is a string that names the key this method opens or creates.
|
|
|
|
*reserved* is a reserved integer, and must be zero. The default is zero.
|
|
|
|
*access* is an integer that specifies an access mask that describes the desired
|
|
security access for the key. Default is :const:`KEY_WRITE`. See
|
|
:ref:`Access Rights <access-rights>` for other allowed values.
|
|
|
|
If *key* is one of the predefined keys, *sub_key* may be ``None``. In that
|
|
case, the handle returned is the same key handle passed in to the function.
|
|
|
|
If the key already exists, this function opens the existing key.
|
|
|
|
The return value is the handle of the opened key. If the function fails, an
|
|
:exc:`OSError` exception is raised.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: DeleteKey(key, sub_key)
|
|
|
|
Deletes the specified key.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*sub_key* is a string that must be a subkey of the key identified by the *key*
|
|
parameter. This value must not be ``None``, and the key may not have subkeys.
|
|
|
|
*This method can not delete keys with subkeys.*
|
|
|
|
If the method succeeds, the entire key, including all of its values, is removed.
|
|
If the method fails, an :exc:`OSError` exception is raised.
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: DeleteKeyEx(key, sub_key, access=KEY_WOW64_64KEY, reserved=0)
|
|
|
|
Deletes the specified key.
|
|
|
|
.. note::
|
|
The :func:`DeleteKeyEx` function is implemented with the RegDeleteKeyEx
|
|
Windows API function, which is specific to 64-bit versions of Windows.
|
|
See the `RegDeleteKeyEx documentation
|
|
<http://msdn.microsoft.com/en-us/library/ms724847%28VS.85%29.aspx>`__.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*sub_key* is a string that must be a subkey of the key identified by the
|
|
*key* parameter. This value must not be ``None``, and the key may not have
|
|
subkeys.
|
|
|
|
*reserved* is a reserved integer, and must be zero. The default is zero.
|
|
|
|
*access* is an integer that specifies an access mask that describes the desired
|
|
security access for the key. Default is :const:`KEY_ALL_ACCESS`. See
|
|
:ref:`Access Rights <access-rights>` for other allowed values.
|
|
|
|
*This method can not delete keys with subkeys.*
|
|
|
|
If the method succeeds, the entire key, including all of its values, is
|
|
removed. If the method fails, an :exc:`OSError` exception is raised.
|
|
|
|
On unsupported Windows versions, :exc:`NotImplementedError` is raised.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: DeleteValue(key, value)
|
|
|
|
Removes a named value from a registry key.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*value* is a string that identifies the value to remove.
|
|
|
|
|
|
.. function:: EnumKey(key, index)
|
|
|
|
Enumerates subkeys of an open registry key, returning a string.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*index* is an integer that identifies the index of the key to retrieve.
|
|
|
|
The function retrieves the name of one subkey each time it is called. It is
|
|
typically called repeatedly until an :exc:`OSError` exception is
|
|
raised, indicating, no more values are available.
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: EnumValue(key, index)
|
|
|
|
Enumerates values of an open registry key, returning a tuple.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*index* is an integer that identifies the index of the value to retrieve.
|
|
|
|
The function retrieves the name of one subkey each time it is called. It is
|
|
typically called repeatedly, until an :exc:`OSError` exception is
|
|
raised, indicating no more values.
|
|
|
|
The result is a tuple of 3 items:
|
|
|
|
+-------+--------------------------------------------+
|
|
| Index | Meaning |
|
|
+=======+============================================+
|
|
| ``0`` | A string that identifies the value name |
|
|
+-------+--------------------------------------------+
|
|
| ``1`` | An object that holds the value data, and |
|
|
| | whose type depends on the underlying |
|
|
| | registry type |
|
|
+-------+--------------------------------------------+
|
|
| ``2`` | An integer that identifies the type of the |
|
|
| | value data (see table in docs for |
|
|
| | :meth:`SetValueEx`) |
|
|
+-------+--------------------------------------------+
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: ExpandEnvironmentStrings(str)
|
|
|
|
Expands environment variable placeholders ``%NAME%`` in strings like
|
|
:const:`REG_EXPAND_SZ`::
|
|
|
|
>>> ExpandEnvironmentStrings('%windir%')
|
|
'C:\\Windows'
|
|
|
|
|
|
.. function:: FlushKey(key)
|
|
|
|
Writes all the attributes of a key to the registry.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
It is not necessary to call :func:`FlushKey` to change a key. Registry changes are
|
|
flushed to disk by the registry using its lazy flusher. Registry changes are
|
|
also flushed to disk at system shutdown. Unlike :func:`CloseKey`, the
|
|
:func:`FlushKey` method returns only when all the data has been written to the
|
|
registry. An application should only call :func:`FlushKey` if it requires
|
|
absolute certainty that registry changes are on disk.
|
|
|
|
.. note::
|
|
|
|
If you don't know whether a :func:`FlushKey` call is required, it probably
|
|
isn't.
|
|
|
|
|
|
.. function:: LoadKey(key, sub_key, file_name)
|
|
|
|
Creates a subkey under the specified key and stores registration information
|
|
from a specified file into that subkey.
|
|
|
|
*key* is a handle returned by :func:`ConnectRegistry` or one of the constants
|
|
:const:`HKEY_USERS` or :const:`HKEY_LOCAL_MACHINE`.
|
|
|
|
*sub_key* is a string that identifies the subkey to load.
|
|
|
|
*file_name* is the name of the file to load registry data from. This file must
|
|
have been created with the :func:`SaveKey` function. Under the file allocation
|
|
table (FAT) file system, the filename may not have an extension.
|
|
|
|
A call to :func:`LoadKey` fails if the calling process does not have the
|
|
:const:`SE_RESTORE_PRIVILEGE` privilege. Note that privileges are different
|
|
from permissions -- see the `RegLoadKey documentation
|
|
<http://msdn.microsoft.com/en-us/library/ms724889%28v=VS.85%29.aspx>`__ for
|
|
more details.
|
|
|
|
If *key* is a handle returned by :func:`ConnectRegistry`, then the path
|
|
specified in *file_name* is relative to the remote computer.
|
|
|
|
|
|
.. function:: OpenKey(key, sub_key, reserved=0, access=KEY_READ)
|
|
OpenKeyEx(key, sub_key, reserved=0, access=KEY_READ)
|
|
|
|
Opens the specified key, returning a :ref:`handle object <handle-object>`.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*sub_key* is a string that identifies the sub_key to open.
|
|
|
|
*reserved* is a reserved integer, and must be zero. The default is zero.
|
|
|
|
*access* is an integer that specifies an access mask that describes the desired
|
|
security access for the key. Default is :const:`KEY_READ`. See :ref:`Access
|
|
Rights <access-rights>` for other allowed values.
|
|
|
|
The result is a new handle to the specified key.
|
|
|
|
If the function fails, :exc:`OSError` is raised.
|
|
|
|
.. versionchanged:: 3.2
|
|
Allow the use of named arguments.
|
|
|
|
.. versionchanged:: 3.3
|
|
See :ref:`above <exception-changed>`.
|
|
|
|
|
|
.. function:: QueryInfoKey(key)
|
|
|
|
Returns information about a key, as a tuple.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
The result is a tuple of 3 items:
|
|
|
|
+-------+---------------------------------------------+
|
|
| Index | Meaning |
|
|
+=======+=============================================+
|
|
| ``0`` | An integer giving the number of sub keys |
|
|
| | this key has. |
|
|
+-------+---------------------------------------------+
|
|
| ``1`` | An integer giving the number of values this |
|
|
| | key has. |
|
|
+-------+---------------------------------------------+
|
|
| ``2`` | An integer giving when the key was last |
|
|
| | modified (if available) as 100's of |
|
|
| | nanoseconds since Jan 1, 1600. |
|
|
+-------+---------------------------------------------+
|
|
|
|
|
|
.. function:: QueryValue(key, sub_key)
|
|
|
|
Retrieves the unnamed value for a key, as a string.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*sub_key* is a string that holds the name of the subkey with which the value is
|
|
associated. If this parameter is ``None`` or empty, the function retrieves the
|
|
value set by the :func:`SetValue` method for the key identified by *key*.
|
|
|
|
Values in the registry have name, type, and data components. This method
|
|
retrieves the data for a key's first value that has a NULL name. But the
|
|
underlying API call doesn't return the type, so always use
|
|
:func:`QueryValueEx` if possible.
|
|
|
|
|
|
.. function:: QueryValueEx(key, value_name)
|
|
|
|
Retrieves the type and data for a specified value name associated with
|
|
an open registry key.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*value_name* is a string indicating the value to query.
|
|
|
|
The result is a tuple of 2 items:
|
|
|
|
+-------+-----------------------------------------+
|
|
| Index | Meaning |
|
|
+=======+=========================================+
|
|
| ``0`` | The value of the registry item. |
|
|
+-------+-----------------------------------------+
|
|
| ``1`` | An integer giving the registry type for |
|
|
| | this value (see table in docs for |
|
|
| | :meth:`SetValueEx`) |
|
|
+-------+-----------------------------------------+
|
|
|
|
|
|
.. function:: SaveKey(key, file_name)
|
|
|
|
Saves the specified key, and all its subkeys to the specified file.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*file_name* is the name of the file to save registry data to. This file
|
|
cannot already exist. If this filename includes an extension, it cannot be
|
|
used on file allocation table (FAT) file systems by the :meth:`LoadKey`
|
|
method.
|
|
|
|
If *key* represents a key on a remote computer, the path described by
|
|
*file_name* is relative to the remote computer. The caller of this method must
|
|
possess the :const:`SeBackupPrivilege` security privilege. Note that
|
|
privileges are different than permissions -- see the
|
|
`Conflicts Between User Rights and Permissions documentation
|
|
<http://msdn.microsoft.com/en-us/library/ms724878%28v=VS.85%29.aspx>`__
|
|
for more details.
|
|
|
|
This function passes NULL for *security_attributes* to the API.
|
|
|
|
|
|
.. function:: SetValue(key, sub_key, type, value)
|
|
|
|
Associates a value with a specified key.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*sub_key* is a string that names the subkey with which the value is associated.
|
|
|
|
*type* is an integer that specifies the type of the data. Currently this must be
|
|
:const:`REG_SZ`, meaning only strings are supported. Use the :func:`SetValueEx`
|
|
function for support for other data types.
|
|
|
|
*value* is a string that specifies the new value.
|
|
|
|
If the key specified by the *sub_key* parameter does not exist, the SetValue
|
|
function creates it.
|
|
|
|
Value lengths are limited by available memory. Long values (more than 2048
|
|
bytes) should be stored as files with the filenames stored in the configuration
|
|
registry. This helps the registry perform efficiently.
|
|
|
|
The key identified by the *key* parameter must have been opened with
|
|
:const:`KEY_SET_VALUE` access.
|
|
|
|
|
|
.. function:: SetValueEx(key, value_name, reserved, type, value)
|
|
|
|
Stores data in the value field of an open registry key.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
*value_name* is a string that names the subkey with which the value is
|
|
associated.
|
|
|
|
*reserved* can be anything -- zero is always passed to the API.
|
|
|
|
*type* is an integer that specifies the type of the data. See
|
|
:ref:`Value Types <value-types>` for the available types.
|
|
|
|
*value* is a string that specifies the new value.
|
|
|
|
This method can also set additional value and type information for the specified
|
|
key. The key identified by the key parameter must have been opened with
|
|
:const:`KEY_SET_VALUE` access.
|
|
|
|
To open the key, use the :func:`CreateKey` or :func:`OpenKey` methods.
|
|
|
|
Value lengths are limited by available memory. Long values (more than 2048
|
|
bytes) should be stored as files with the filenames stored in the configuration
|
|
registry. This helps the registry perform efficiently.
|
|
|
|
|
|
.. function:: DisableReflectionKey(key)
|
|
|
|
Disables registry reflection for 32-bit processes running on a 64-bit
|
|
operating system.
|
|
|
|
*key* is an already open key, or one of the predefined :ref:`HKEY_* constants
|
|
<hkey-constants>`.
|
|
|
|
Will generally raise :exc:`NotImplemented` if executed on a 32-bit operating
|
|
system.
|
|
|
|
If the key is not on the reflection list, the function succeeds but has no
|
|
effect. Disabling reflection for a key does not affect reflection of any
|
|
subkeys.
|
|
|
|
|
|
.. function:: EnableReflectionKey(key)
|
|
|
|
Restores registry reflection for the specified disabled key.
|
|
|
|
*key* is an already open key, or one of the predefined :ref:`HKEY_* constants
|
|
<hkey-constants>`.
|
|
|
|
Will generally raise :exc:`NotImplemented` if executed on a 32-bit operating
|
|
system.
|
|
|
|
Restoring reflection for a key does not affect reflection of any subkeys.
|
|
|
|
|
|
.. function:: QueryReflectionKey(key)
|
|
|
|
Determines the reflection state for the specified key.
|
|
|
|
*key* is an already open key, or one of the predefined
|
|
:ref:`HKEY_* constants <hkey-constants>`.
|
|
|
|
Returns ``True`` if reflection is disabled.
|
|
|
|
Will generally raise :exc:`NotImplemented` if executed on a 32-bit
|
|
operating system.
|
|
|
|
|
|
.. _constants:
|
|
|
|
Constants
|
|
------------------
|
|
|
|
The following constants are defined for use in many :mod:`_winreg` functions.
|
|
|
|
.. _hkey-constants:
|
|
|
|
HKEY_* Constants
|
|
++++++++++++++++
|
|
|
|
.. data:: HKEY_CLASSES_ROOT
|
|
|
|
Registry entries subordinate to this key define types (or classes) of
|
|
documents and the properties associated with those types. Shell and
|
|
COM applications use the information stored under this key.
|
|
|
|
|
|
.. data:: HKEY_CURRENT_USER
|
|
|
|
Registry entries subordinate to this key define the preferences of
|
|
the current user. These preferences include the settings of
|
|
environment variables, data about program groups, colors, printers,
|
|
network connections, and application preferences.
|
|
|
|
.. data:: HKEY_LOCAL_MACHINE
|
|
|
|
Registry entries subordinate to this key define the physical state
|
|
of the computer, including data about the bus type, system memory,
|
|
and installed hardware and software.
|
|
|
|
.. data:: HKEY_USERS
|
|
|
|
Registry entries subordinate to this key define the default user
|
|
configuration for new users on the local computer and the user
|
|
configuration for the current user.
|
|
|
|
.. data:: HKEY_PERFORMANCE_DATA
|
|
|
|
Registry entries subordinate to this key allow you to access
|
|
performance data. The data is not actually stored in the registry;
|
|
the registry functions cause the system to collect the data from
|
|
its source.
|
|
|
|
|
|
.. data:: HKEY_CURRENT_CONFIG
|
|
|
|
Contains information about the current hardware profile of the
|
|
local computer system.
|
|
|
|
.. data:: HKEY_DYN_DATA
|
|
|
|
This key is not used in versions of Windows after 98.
|
|
|
|
|
|
.. _access-rights:
|
|
|
|
Access Rights
|
|
+++++++++++++
|
|
|
|
For more information, see `Registry Key Security and Access
|
|
<http://msdn.microsoft.com/en-us/library/ms724878%28v=VS.85%29.aspx>`__.
|
|
|
|
.. data:: KEY_ALL_ACCESS
|
|
|
|
Combines the STANDARD_RIGHTS_REQUIRED, :const:`KEY_QUERY_VALUE`,
|
|
:const:`KEY_SET_VALUE`, :const:`KEY_CREATE_SUB_KEY`,
|
|
:const:`KEY_ENUMERATE_SUB_KEYS`, :const:`KEY_NOTIFY`,
|
|
and :const:`KEY_CREATE_LINK` access rights.
|
|
|
|
.. data:: KEY_WRITE
|
|
|
|
Combines the STANDARD_RIGHTS_WRITE, :const:`KEY_SET_VALUE`, and
|
|
:const:`KEY_CREATE_SUB_KEY` access rights.
|
|
|
|
.. data:: KEY_READ
|
|
|
|
Combines the STANDARD_RIGHTS_READ, :const:`KEY_QUERY_VALUE`,
|
|
:const:`KEY_ENUMERATE_SUB_KEYS`, and :const:`KEY_NOTIFY` values.
|
|
|
|
.. data:: KEY_EXECUTE
|
|
|
|
Equivalent to :const:`KEY_READ`.
|
|
|
|
.. data:: KEY_QUERY_VALUE
|
|
|
|
Required to query the values of a registry key.
|
|
|
|
.. data:: KEY_SET_VALUE
|
|
|
|
Required to create, delete, or set a registry value.
|
|
|
|
.. data:: KEY_CREATE_SUB_KEY
|
|
|
|
Required to create a subkey of a registry key.
|
|
|
|
.. data:: KEY_ENUMERATE_SUB_KEYS
|
|
|
|
Required to enumerate the subkeys of a registry key.
|
|
|
|
.. data:: KEY_NOTIFY
|
|
|
|
Required to request change notifications for a registry key or for
|
|
subkeys of a registry key.
|
|
|
|
.. data:: KEY_CREATE_LINK
|
|
|
|
Reserved for system use.
|
|
|
|
|
|
.. _64-bit-access-rights:
|
|
|
|
64-bit Specific
|
|
***************
|
|
|
|
For more information, see `Accessing an Alternate Registry View
|
|
<http://msdn.microsoft.com/en-us/library/aa384129(v=VS.85).aspx>`__.
|
|
|
|
.. data:: KEY_WOW64_64KEY
|
|
|
|
Indicates that an application on 64-bit Windows should operate on
|
|
the 64-bit registry view.
|
|
|
|
.. data:: KEY_WOW64_32KEY
|
|
|
|
Indicates that an application on 64-bit Windows should operate on
|
|
the 32-bit registry view.
|
|
|
|
|
|
.. _value-types:
|
|
|
|
Value Types
|
|
+++++++++++
|
|
|
|
For more information, see `Registry Value Types
|
|
<http://msdn.microsoft.com/en-us/library/ms724884%28v=VS.85%29.aspx>`__.
|
|
|
|
.. data:: REG_BINARY
|
|
|
|
Binary data in any form.
|
|
|
|
.. data:: REG_DWORD
|
|
|
|
32-bit number.
|
|
|
|
.. data:: REG_DWORD_LITTLE_ENDIAN
|
|
|
|
A 32-bit number in little-endian format.
|
|
|
|
.. data:: REG_DWORD_BIG_ENDIAN
|
|
|
|
A 32-bit number in big-endian format.
|
|
|
|
.. data:: REG_EXPAND_SZ
|
|
|
|
Null-terminated string containing references to environment
|
|
variables (``%PATH%``).
|
|
|
|
.. data:: REG_LINK
|
|
|
|
A Unicode symbolic link.
|
|
|
|
.. data:: REG_MULTI_SZ
|
|
|
|
A sequence of null-terminated strings, terminated by two null characters.
|
|
(Python handles this termination automatically.)
|
|
|
|
.. data:: REG_NONE
|
|
|
|
No defined value type.
|
|
|
|
.. data:: REG_RESOURCE_LIST
|
|
|
|
A device-driver resource list.
|
|
|
|
.. data:: REG_FULL_RESOURCE_DESCRIPTOR
|
|
|
|
A hardware setting.
|
|
|
|
.. data:: REG_RESOURCE_REQUIREMENTS_LIST
|
|
|
|
A hardware resource list.
|
|
|
|
.. data:: REG_SZ
|
|
|
|
A null-terminated string.
|
|
|
|
|
|
.. _handle-object:
|
|
|
|
Registry Handle Objects
|
|
-----------------------
|
|
|
|
This object wraps a Windows HKEY object, automatically closing it when the
|
|
object is destroyed. To guarantee cleanup, you can call either the
|
|
:meth:`~PyHKEY.Close` method on the object, or the :func:`CloseKey` function.
|
|
|
|
All registry functions in this module return one of these objects.
|
|
|
|
All registry functions in this module which accept a handle object also accept
|
|
an integer, however, use of the handle object is encouraged.
|
|
|
|
Handle objects provide semantics for :meth:`__bool__` -- thus ::
|
|
|
|
if handle:
|
|
print("Yes")
|
|
|
|
will print ``Yes`` if the handle is currently valid (has not been closed or
|
|
detached).
|
|
|
|
The object also support comparison semantics, so handle objects will compare
|
|
true if they both reference the same underlying Windows handle value.
|
|
|
|
Handle objects can be converted to an integer (e.g., using the built-in
|
|
:func:`int` function), in which case the underlying Windows handle value is
|
|
returned. You can also use the :meth:`~PyHKEY.Detach` method to return the
|
|
integer handle, and also disconnect the Windows handle from the handle object.
|
|
|
|
|
|
.. method:: PyHKEY.Close()
|
|
|
|
Closes the underlying Windows handle.
|
|
|
|
If the handle is already closed, no error is raised.
|
|
|
|
|
|
.. method:: PyHKEY.Detach()
|
|
|
|
Detaches the Windows handle from the handle object.
|
|
|
|
The result is an integer that holds the value of the handle before it is
|
|
detached. If the handle is already detached or closed, this will return
|
|
zero.
|
|
|
|
After calling this function, the handle is effectively invalidated, but the
|
|
handle is not closed. You would call this function when you need the
|
|
underlying Win32 handle to exist beyond the lifetime of the handle object.
|
|
|
|
.. method:: PyHKEY.__enter__()
|
|
PyHKEY.__exit__(\*exc_info)
|
|
|
|
The HKEY object implements :meth:`~object.__enter__` and
|
|
:meth:`~object.__exit__` and thus supports the context protocol for the
|
|
:keyword:`with` statement::
|
|
|
|
with OpenKey(HKEY_LOCAL_MACHINE, "foo") as key:
|
|
... # work with key
|
|
|
|
will automatically close *key* when control leaves the :keyword:`with` block.
|
|
|
|
|