cpython/Doc/library/_winreg.rst

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:mod:`_winreg` -- Windows registry access
=========================================
.. module:: _winreg
:platform: Windows
:synopsis: Routines and objects for manipulating the Windows registry.
.. sectionauthor:: Mark Hammond <MarkH@ActiveState.com>
.. note::
The :mod:`_winreg` module has been renamed to :mod:`winreg` in Python 3.0.
The :term:`2to3` tool will automatically adapt imports when converting your
sources to 3.0.
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.. versionadded:: 2.0
These functions expose the Windows registry API to Python. Instead of using an
integer as the registry handle, a handle object is used to ensure that the
handles are closed correctly, even if the programmer neglects to explicitly
close them.
This module exposes a very low-level interface to the Windows registry; it is
expected that in the future a new ``winreg`` module will be created offering a
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higher-level interface to the registry API.
This module offers the following functions:
.. function:: CloseKey(hkey)
Closes a previously opened registry key. The hkey argument specifies a
previously opened key.
Note that if *hkey* is not closed using this method (or via
:meth:`handle.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>`.
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*computer_name* is the name of the remote computer, of the form
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``r"\\computername"``. If ``None``, the local computer is used.
*key* is the predefined handle to connect to.
Merged revisions 70642,70648,70656,70661,70765,70773,70789,70824-70825,70828,70830,70832,70836,70838,70842,70851,70855,70857-70858 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r70642 | georg.brandl | 2009-03-28 01:48:48 +0100 (Sa, 28 Mär 2009) | 1 line Fix typo. ........ r70648 | georg.brandl | 2009-03-28 20:10:37 +0100 (Sa, 28 Mär 2009) | 1 line #5324: document __subclasses__(). ........ r70656 | georg.brandl | 2009-03-28 20:33:33 +0100 (Sa, 28 Mär 2009) | 2 lines Add a script to fixup rst files if the pre-commit hook rejects them. ........ r70661 | georg.brandl | 2009-03-28 20:57:36 +0100 (Sa, 28 Mär 2009) | 2 lines Add section numbering to some of the larger subdocuments. ........ r70765 | georg.brandl | 2009-03-31 00:09:34 +0200 (Di, 31 Mär 2009) | 1 line #5199: make warning about vars() assignment more visible. ........ r70773 | georg.brandl | 2009-03-31 00:43:00 +0200 (Di, 31 Mär 2009) | 1 line #5039: make it clear that the impl. note refers to CPython. ........ r70789 | georg.brandl | 2009-03-31 03:25:15 +0200 (Di, 31 Mär 2009) | 1 line Fix a wrong struct field assignment (docstring as closure). ........ r70824 | georg.brandl | 2009-03-31 17:43:20 +0200 (Di, 31 Mär 2009) | 1 line #5519: remove reference to Kodos, which seems dead. ........ r70825 | georg.brandl | 2009-03-31 17:46:30 +0200 (Di, 31 Mär 2009) | 1 line #5566: fix versionadded from PyLong ssize_t functions. ........ r70828 | georg.brandl | 2009-03-31 17:50:16 +0200 (Di, 31 Mär 2009) | 1 line #5581: fget argument of abstractproperty is optional as well. ........ r70830 | georg.brandl | 2009-03-31 18:11:45 +0200 (Di, 31 Mär 2009) | 1 line #5529: backport new docs of import semantics written by Brett to 2.x. ........ r70832 | georg.brandl | 2009-03-31 18:31:11 +0200 (Di, 31 Mär 2009) | 1 line #1386675: specify WindowsError as the exception, because it has a winerror attribute that EnvironmentError doesnt have. ........ r70836 | georg.brandl | 2009-03-31 18:50:25 +0200 (Di, 31 Mär 2009) | 1 line #5417: replace references to undocumented functions by ones to documented functions. ........ r70838 | georg.brandl | 2009-03-31 18:54:38 +0200 (Di, 31 Mär 2009) | 1 line #992207: document that the parser only accepts \\n newlines. ........ r70842 | georg.brandl | 2009-03-31 19:13:06 +0200 (Di, 31 Mär 2009) | 1 line #970783: document PyObject_Generic[GS]etAttr. ........ r70851 | georg.brandl | 2009-03-31 20:26:55 +0200 (Di, 31 Mär 2009) | 1 line #837577: note cryptic return value of spawn*e on invalid env dicts. ........ r70855 | georg.brandl | 2009-03-31 20:30:37 +0200 (Di, 31 Mär 2009) | 1 line #5245: note that PyRun_SimpleString doesnt return on SystemExit. ........ r70857 | georg.brandl | 2009-03-31 20:33:10 +0200 (Di, 31 Mär 2009) | 1 line #5227: note that Py_Main doesnt return on SystemExit. ........ r70858 | georg.brandl | 2009-03-31 20:38:56 +0200 (Di, 31 Mär 2009) | 1 line #5241: document missing U in regex howto. ........
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The return value is the handle of the opened key. If the function fails, a
:exc:`WindowsError` exception is raised.
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.. function:: CreateKey(key, sub_key)
Creates or opens the specified key, returning a
:ref:`handle object <handle-object>`.
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*key* is an already open key, or one of the predefined :const:`HKEY_\*`
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constants.
*sub_key* is a string that names the key this method opens or creates.
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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.
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If the key already exists, this function opens the existing key.
Merged revisions 70642,70648,70656,70661,70765,70773,70789,70824-70825,70828,70830,70832,70836,70838,70842,70851,70855,70857-70858 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r70642 | georg.brandl | 2009-03-28 01:48:48 +0100 (Sa, 28 Mär 2009) | 1 line Fix typo. ........ r70648 | georg.brandl | 2009-03-28 20:10:37 +0100 (Sa, 28 Mär 2009) | 1 line #5324: document __subclasses__(). ........ r70656 | georg.brandl | 2009-03-28 20:33:33 +0100 (Sa, 28 Mär 2009) | 2 lines Add a script to fixup rst files if the pre-commit hook rejects them. ........ r70661 | georg.brandl | 2009-03-28 20:57:36 +0100 (Sa, 28 Mär 2009) | 2 lines Add section numbering to some of the larger subdocuments. ........ r70765 | georg.brandl | 2009-03-31 00:09:34 +0200 (Di, 31 Mär 2009) | 1 line #5199: make warning about vars() assignment more visible. ........ r70773 | georg.brandl | 2009-03-31 00:43:00 +0200 (Di, 31 Mär 2009) | 1 line #5039: make it clear that the impl. note refers to CPython. ........ r70789 | georg.brandl | 2009-03-31 03:25:15 +0200 (Di, 31 Mär 2009) | 1 line Fix a wrong struct field assignment (docstring as closure). ........ r70824 | georg.brandl | 2009-03-31 17:43:20 +0200 (Di, 31 Mär 2009) | 1 line #5519: remove reference to Kodos, which seems dead. ........ r70825 | georg.brandl | 2009-03-31 17:46:30 +0200 (Di, 31 Mär 2009) | 1 line #5566: fix versionadded from PyLong ssize_t functions. ........ r70828 | georg.brandl | 2009-03-31 17:50:16 +0200 (Di, 31 Mär 2009) | 1 line #5581: fget argument of abstractproperty is optional as well. ........ r70830 | georg.brandl | 2009-03-31 18:11:45 +0200 (Di, 31 Mär 2009) | 1 line #5529: backport new docs of import semantics written by Brett to 2.x. ........ r70832 | georg.brandl | 2009-03-31 18:31:11 +0200 (Di, 31 Mär 2009) | 1 line #1386675: specify WindowsError as the exception, because it has a winerror attribute that EnvironmentError doesnt have. ........ r70836 | georg.brandl | 2009-03-31 18:50:25 +0200 (Di, 31 Mär 2009) | 1 line #5417: replace references to undocumented functions by ones to documented functions. ........ r70838 | georg.brandl | 2009-03-31 18:54:38 +0200 (Di, 31 Mär 2009) | 1 line #992207: document that the parser only accepts \\n newlines. ........ r70842 | georg.brandl | 2009-03-31 19:13:06 +0200 (Di, 31 Mär 2009) | 1 line #970783: document PyObject_Generic[GS]etAttr. ........ r70851 | georg.brandl | 2009-03-31 20:26:55 +0200 (Di, 31 Mär 2009) | 1 line #837577: note cryptic return value of spawn*e on invalid env dicts. ........ r70855 | georg.brandl | 2009-03-31 20:30:37 +0200 (Di, 31 Mär 2009) | 1 line #5245: note that PyRun_SimpleString doesnt return on SystemExit. ........ r70857 | georg.brandl | 2009-03-31 20:33:10 +0200 (Di, 31 Mär 2009) | 1 line #5227: note that Py_Main doesnt return on SystemExit. ........ r70858 | georg.brandl | 2009-03-31 20:38:56 +0200 (Di, 31 Mär 2009) | 1 line #5241: document missing U in regex howto. ........
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The return value is the handle of the opened key. If the function fails, a
:exc:`WindowsError` exception is raised.
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.. function:: DeleteKey(key, sub_key)
Deletes the specified key.
*key* is an already open key, or any one of the predefined :const:`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, a :exc:`WindowsError` exception is raised.
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.. function:: DeleteValue(key, value)
Removes a named value from a registry key.
*key* is an already open key, or one of the predefined :const:`HKEY_\*`
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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 any one of the predefined :const:`HKEY_\*`
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constants.
*index* is an integer that identifies the index of the key to retrieve.
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The function retrieves the name of one subkey each time it is called. It is
typically called repeatedly until a :exc:`WindowsError` exception is
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raised, indicating, no more values are available.
.. function:: EnumValue(key, index)
Enumerates values of an open registry key, returning a tuple.
*key* is an already open key, or any one of the predefined :const:`HKEY_\*`
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constants.
*index* is an integer that identifies the index of the value to retrieve.
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The function retrieves the name of one subkey each time it is called. It is
typically called repeatedly, until a :exc:`WindowsError` exception is
raised, indicating no more values.
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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 |
+-------+--------------------------------------------+
.. function:: ExpandEnvironmentStrings(unicode)
Expands environment strings %NAME% in unicode string like const:`REG_EXPAND_SZ`::
>>> ExpandEnvironmentStrings(u"%windir%")
u"C:\\Windows"
.. versionadded:: 2.6
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.. function:: FlushKey(key)
Writes all the attributes of a key to the registry.
*key* is an already open key, or one of the predefined :const:`HKEY_\*`
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constants.
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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
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registry. An application should only call :func:`FlushKey` if it requires
absolute certainty that registry changes are on disk.
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.. note::
If you don't know whether a :func:`FlushKey` call is required, it probably
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isn't.
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.. function:: LoadKey(key, sub_key, file_name)
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Creates a subkey under the specified key and stores registration information
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from a specified file into that subkey.
*key* is an already open key, or any of the predefined :const:`HKEY_\*`
constants.
*sub_key* is a string that identifies the sub_key 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 LoadKey() fails if the calling process does not have the
:const:`SE_RESTORE_PRIVILEGE` privilege. Note that privileges are different than
permissions -- see the Win32 documentation for more details.
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If *key* is a handle returned by :func:`ConnectRegistry`, then the path
specified in *fileName* is relative to the remote computer.
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The Win32 documentation implies *key* must be in the :const:`HKEY_USER` or
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:const:`HKEY_LOCAL_MACHINE` tree. This may or may not be true.
.. function:: OpenKey(key, sub_key, res=0, sam=KEY_READ)
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Opens the specified key, returning a :ref:`handle object <handle-object>`.
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*key* is an already open key, or any one of the predefined :const:`HKEY_\*`
constants.
*sub_key* is a string that identifies the sub_key to open.
*res* is a reserved integer, and must be zero. The default is zero.
*sam* is an integer that specifies an access mask that describes the desired
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security access for the key. Default is :const:`KEY_READ`
The result is a new handle to the specified key.
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If the function fails, :exc:`WindowsError` is raised.
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.. function:: OpenKeyEx()
The functionality of :func:`OpenKeyEx` is provided via :func:`OpenKey`,
by the use of default arguments.
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.. function:: QueryInfoKey(key)
Returns information about a key, as a tuple.
*key* is an already open key, or one of the predefined :const:`HKEY_\*`
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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`` | A long 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.
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*key* is an already open key, or one of the predefined :const:`HKEY_\*`
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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*.
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Merged revisions 71058,71149-71150,71212,71214-71216,71222,71225,71234,71237-71238,71240-71241,71243,71249,71251 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r71058 | georg.brandl | 2009-04-02 20:09:04 +0200 (Do, 02 Apr 2009) | 3 lines PyErr_NormalizeException may not set an error, so convert the PyErr_SetObject call on hitting the recursion limit into just assigning it to the arguments provided. ........ r71149 | georg.brandl | 2009-04-04 15:42:39 +0200 (Sa, 04 Apr 2009) | 1 line #5642: clarify map() compatibility to the builtin. ........ r71150 | georg.brandl | 2009-04-04 15:45:49 +0200 (Sa, 04 Apr 2009) | 1 line #5601: clarify that webbrowser is not meant for file names. ........ r71212 | georg.brandl | 2009-04-05 12:24:20 +0200 (So, 05 Apr 2009) | 1 line #1742837: expand HTTP server docs, and fix SocketServer ones to document methods as methods, not functions. ........ r71214 | georg.brandl | 2009-04-05 12:29:57 +0200 (So, 05 Apr 2009) | 1 line Normalize spelling of Mac OS X. ........ r71215 | georg.brandl | 2009-04-05 12:32:26 +0200 (So, 05 Apr 2009) | 1 line Avoid sure signs of a diseased mind. ........ r71216 | georg.brandl | 2009-04-05 12:41:02 +0200 (So, 05 Apr 2009) | 1 line #1718017: document the relation of os.path and the posixpath, ntpath etc. modules better. ........ r71222 | georg.brandl | 2009-04-05 13:07:14 +0200 (So, 05 Apr 2009) | 1 line #5615: make it possible to configure --without-threads again. ........ r71225 | georg.brandl | 2009-04-05 13:54:07 +0200 (So, 05 Apr 2009) | 1 line #5580: no need to use parentheses when converterr() argument is actually a type description. ........ r71234 | georg.brandl | 2009-04-05 15:16:35 +0200 (So, 05 Apr 2009) | 1 line Whitespace normalization. ........ r71237 | georg.brandl | 2009-04-05 16:24:52 +0200 (So, 05 Apr 2009) | 1 line #1326077: fix traceback formatting of SyntaxErrors. This fixes two differences with formatting coming from Python: a) the reproduction of location details in the error message if no line text is given, b) the prefixing of the last line by one space. ........ r71238 | georg.brandl | 2009-04-05 16:25:41 +0200 (So, 05 Apr 2009) | 1 line Add NEWS entry for r71237. ........ r71240 | georg.brandl | 2009-04-05 16:40:06 +0200 (So, 05 Apr 2009) | 1 line #5370: doc update about unpickling objects with custom __getattr__ etc. methods. ........ r71241 | georg.brandl | 2009-04-05 16:48:49 +0200 (So, 05 Apr 2009) | 1 line #5471: fix expanduser() for $HOME set to "/". ........ r71243 | georg.brandl | 2009-04-05 17:14:29 +0200 (So, 05 Apr 2009) | 1 line #5432: make plistlib docstring a raw string, since it contains examples with backslash escapes. ........ r71249 | georg.brandl | 2009-04-05 18:30:43 +0200 (So, 05 Apr 2009) | 1 line #5444: adapt make.bat to new htmlhelp output file name. ........ r71251 | georg.brandl | 2009-04-05 19:17:42 +0200 (So, 05 Apr 2009) | 1 line #5298: clarify docs about GIL by using more consistent wording. ........
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Values in the registry have name, type, and data components. This method
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retrieves the data for a key's first value that has a NULL name. But the
Merged revisions 71058,71149-71150,71212,71214-71216,71222,71225,71234,71237-71238,71240-71241,71243,71249,71251 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r71058 | georg.brandl | 2009-04-02 20:09:04 +0200 (Do, 02 Apr 2009) | 3 lines PyErr_NormalizeException may not set an error, so convert the PyErr_SetObject call on hitting the recursion limit into just assigning it to the arguments provided. ........ r71149 | georg.brandl | 2009-04-04 15:42:39 +0200 (Sa, 04 Apr 2009) | 1 line #5642: clarify map() compatibility to the builtin. ........ r71150 | georg.brandl | 2009-04-04 15:45:49 +0200 (Sa, 04 Apr 2009) | 1 line #5601: clarify that webbrowser is not meant for file names. ........ r71212 | georg.brandl | 2009-04-05 12:24:20 +0200 (So, 05 Apr 2009) | 1 line #1742837: expand HTTP server docs, and fix SocketServer ones to document methods as methods, not functions. ........ r71214 | georg.brandl | 2009-04-05 12:29:57 +0200 (So, 05 Apr 2009) | 1 line Normalize spelling of Mac OS X. ........ r71215 | georg.brandl | 2009-04-05 12:32:26 +0200 (So, 05 Apr 2009) | 1 line Avoid sure signs of a diseased mind. ........ r71216 | georg.brandl | 2009-04-05 12:41:02 +0200 (So, 05 Apr 2009) | 1 line #1718017: document the relation of os.path and the posixpath, ntpath etc. modules better. ........ r71222 | georg.brandl | 2009-04-05 13:07:14 +0200 (So, 05 Apr 2009) | 1 line #5615: make it possible to configure --without-threads again. ........ r71225 | georg.brandl | 2009-04-05 13:54:07 +0200 (So, 05 Apr 2009) | 1 line #5580: no need to use parentheses when converterr() argument is actually a type description. ........ r71234 | georg.brandl | 2009-04-05 15:16:35 +0200 (So, 05 Apr 2009) | 1 line Whitespace normalization. ........ r71237 | georg.brandl | 2009-04-05 16:24:52 +0200 (So, 05 Apr 2009) | 1 line #1326077: fix traceback formatting of SyntaxErrors. This fixes two differences with formatting coming from Python: a) the reproduction of location details in the error message if no line text is given, b) the prefixing of the last line by one space. ........ r71238 | georg.brandl | 2009-04-05 16:25:41 +0200 (So, 05 Apr 2009) | 1 line Add NEWS entry for r71237. ........ r71240 | georg.brandl | 2009-04-05 16:40:06 +0200 (So, 05 Apr 2009) | 1 line #5370: doc update about unpickling objects with custom __getattr__ etc. methods. ........ r71241 | georg.brandl | 2009-04-05 16:48:49 +0200 (So, 05 Apr 2009) | 1 line #5471: fix expanduser() for $HOME set to "/". ........ r71243 | georg.brandl | 2009-04-05 17:14:29 +0200 (So, 05 Apr 2009) | 1 line #5432: make plistlib docstring a raw string, since it contains examples with backslash escapes. ........ r71249 | georg.brandl | 2009-04-05 18:30:43 +0200 (So, 05 Apr 2009) | 1 line #5444: adapt make.bat to new htmlhelp output file name. ........ r71251 | georg.brandl | 2009-04-05 19:17:42 +0200 (So, 05 Apr 2009) | 1 line #5298: clarify docs about GIL by using more consistent wording. ........
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underlying API call doesn't return the type, so always use
:func:`QueryValueEx` if possible.
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.. function:: QueryValueEx(key, value_name)
Retrieves the type and data for a specified value name associated with
an open registry key.
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*key* is an already open key, or one of the predefined :const:`HKEY_\*`
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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. |
+-------+-----------------------------------------+
.. 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 :const:`HKEY_\*`
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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`, :meth:`ReplaceKey`
or :meth:`RestoreKey` methods.
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If *key* represents a key on a remote computer, the path described by
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*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 Win32 documentation for
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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 :const:`HKEY_\*`
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constants.
*sub_key* is a string that names the subkey with which the value is associated.
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*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
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: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 :const:`HKEY_\*`
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constants.
*value_name* is a string that names the subkey with which the value is
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associated.
*type* is an integer that specifies the type of the data. This should be one
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of the following constants defined in this module:
+----------------------------------+---------------------------------------------+
| Constant | Meaning |
+==================================+=============================================+
| :const:`REG_BINARY` | Binary data in any form. |
+----------------------------------+---------------------------------------------+
| :const:`REG_DWORD` | A 32-bit number. |
+----------------------------------+---------------------------------------------+
| :const:`REG_DWORD_LITTLE_ENDIAN` | A 32-bit number in little-endian format. |
+----------------------------------+---------------------------------------------+
| :const:`REG_DWORD_BIG_ENDIAN` | A 32-bit number in big-endian format. |
+----------------------------------+---------------------------------------------+
| :const:`REG_EXPAND_SZ` | Null-terminated string containing |
| | references to environment variables |
| | (``%PATH%``). |
+----------------------------------+---------------------------------------------+
| :const:`REG_LINK` | A Unicode symbolic link. |
+----------------------------------+---------------------------------------------+
| :const:`REG_MULTI_SZ` | A sequence of null-terminated strings, |
| | terminated by two null characters. (Python |
| | handles this termination automatically.) |
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+----------------------------------+---------------------------------------------+
| :const:`REG_NONE` | No defined value type. |
+----------------------------------+---------------------------------------------+
| :const:`REG_RESOURCE_LIST` | A device-driver resource list. |
+----------------------------------+---------------------------------------------+
| :const:`REG_SZ` | A null-terminated string. |
+----------------------------------+---------------------------------------------+
*reserved* can be anything -- zero is always passed to the API.
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*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.
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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.
.. _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:`Close` method on the object, or the :func:`CloseKey` function.
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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.
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Handle objects provide semantics for :meth:`__nonzero__` -- thus::
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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
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:func:`int` function), in which case the underlying Windows handle value is
returned. You can also use the :meth:`Detach` method to return the integer
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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 (or long on 64 bit Windows) 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.
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.. method:: PyHKEY.__enter__()
PyHKEY.__exit__(\*exc_info)
The HKEY object implements :meth:`__enter__` and :meth:`__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.
.. versionadded:: 2.6