20.2 `_winreg` - Windows registry access

Availability: Windows.

New in version 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 higher-level interface to the registry API.

This module offers the following functions:

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 the handle.Close()Closed when the hkey object is destroyed by Python.

ConnectRegistry(computer_name, key)

Establishes a connection to a predefined registry handle on another computer, and returns a handle object

computer_name is the name of the remote computer, of the form "\\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 EnvironmentError exception is raised.

CreateKey(key, sub_key)

Creates or opens the specified key, returning a handle object

key is an already open key, or one of the predefined 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 EnvironmentError exception is raised.

DeleteKey(key, sub_key)

Deletes the specified key.

key is an already open key, or any one of the predefined 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 EnvironmentError exception is raised.

DeleteValue(key, value)

Removes a named value from a registry key.

key is an already open key, or one of the predefined HKEY_*Constants.

value is a string that identifies the value to remove.

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 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 EnvironmentError exception is raised, indicating, no more values are available.

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 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 EnvironmentError 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

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

FlushKey(key)

Writes all the attributes of a key to the registry.

key is an already open key, or one of the predefined HKEY_*Constants.

It is not necessary to call RegFlushKey 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 CloseKey(), the FlushKey() method returns only when all the data has been written to the registry. An application should only call FlushKey() if it requires absolute certainty that registry changes are on disk.

If you don't know whether a FlushKey()Call is required, it probably isn't.

RegLoadKey(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 an already open key, or any of the predefined 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 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 SE_RESTORE_PRIVILEGE privilege. Note that privileges are different than permissions - see the Win32 documentation for more details.

If key is a handle returned by ConnectRegistry(), then the path specified in fileName is relative to the remote computer.

The Win32 documentation implies key must be in the HKEY_USER or HKEY_LOCAL_MACHINE tree. This may or may not be true.

OpenKey(key, sub_key[, res = 0][, sam = KEY_READ])

Opens the specified key, returning a handle object

key is an already open key, or any one of the predefined 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 security access for the key. Default is KEY_READ

The result is a new handle to the specified key

If the function fails, EnvironmentError is raised.

OpenKeyEx(): The functionality of OpenKeyEx() is provided via OpenKey(), by the use of default arguments.

QueryInfoKey(key)

Returns information about a key, as a tuple.

key is an already open key, or one of the predefined 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 A long integer giving when the key was last modified (if available) as 100's of nanoseconds since Jan 1, 1600.

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.

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 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 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, Lame Lame Lame, DO NOT USE THIS!!!

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 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.

Index	Meaning
`0`	The value of the registry item.
`1`	An integer giving the registry type for this value.

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 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 LoadKey(), ReplaceKey() or RestoreKey() methods.

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 SeBackupPrivilege security privilege. Note that privileges are different than permissions - see the Win32 documentation for more details.

This function passes NULL for security_attributes to the API.

SetValue(key, sub_key, type, value)

Associates a value with a specified key.

key is an already open key, or one of the predefined 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 REG_SZ, meaning only strings are supported. Use the 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 KEY_SET_VALUE access.

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 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. This should be one of the following constants defined in this module:

Constant Meaning

REG_BINARY Binary data in any form.
REG_DWORD A 32-bit number.
REG_DWORD_LITTLE_ENDIAN A 32-bit number in little-endian format.
REG_DWORD_BIG_ENDIAN A 32-bit number in big-endian format.
REG_EXPAND_SZ Null-terminated string containing references to environment variables ("%PATH%").
REG_LINK A Unicode symbolic link.
REG_MULTI_SZ A sequence of null-terminated strings, terminated by two null characters. (Python handles this termination automatically.)
REG_NONE No defined value type.
REG_RESOURCE_LIST A device-driver resource list.
REG_SZ A null-terminated string.

Constant	Meaning
`REG_BINARY`	Binary data in any form.
`REG_DWORD`	A 32-bit number.
`REG_DWORD_LITTLE_ENDIAN`	A 32-bit number in little-endian format.
`REG_DWORD_BIG_ENDIAN`	A 32-bit number in big-endian format.
`REG_EXPAND_SZ`	Null-terminated string containing references to environment variables ("`%PATH%`").
`REG_LINK`	A Unicode symbolic link.
`REG_MULTI_SZ`	A sequence of null-terminated strings, terminated by two null characters. (Python handles this termination automatically.)
`REG_NONE`	No defined value type.
`REG_RESOURCE_LIST`	A device-driver resource list.
`REG_SZ`	A null-terminated string.

reservedCan be anything - zero is always passed to the API.

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 KEY_SET_VALUE access.

To open the key, use the CreateKeyEx() or OpenKey() methods.

Subsections

20.2.1 Registry Handle Objects

See About this document... for information on suggesting changes.

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