winreg: implement RegGetValue

[imba-tjd]

BPO	45854
Nosy	@imba-tjd
PRs	bpo-45854: winreg - implement RegGetValue #29684

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-11-20.15:43:57.363>
labels = ['type-feature', 'library', '3.11']
title = 'winreg: implement RegGetValue'
updated_at = <Date 2021-11-21.04:21:04.541>
user = 'https://github.com/imba-tjd'

bugs.python.org fields:

activity = <Date 2021-11-21.04:21:04.541>
actor = 'imba-tjd'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-11-20.15:43:57.363>
creator = 'imba-tjd'
dependencies = []
files = []
hgrepos = []
issue_num = 45854
keywords = ['patch']
message_count = 1.0
messages = ['406663']
nosy_count = 1.0
nosy_names = ['imba-tjd']
pr_nums = ['29684']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45854'
versions = ['Python 3.11']

Linked PRs

• gh-90012: Add winreg.GetValue #141625
• gh-90012: Add winreg.GetValue #141626

[imba-tjd]

The RegGetValue() API was introduced in Vista.

It's similar to RegOpenKeyEx() but it's more convenient because you don't need OpenKey() and CloseKey() when using predefined HKEY_* constants.

I think it would be good to implement it.

If so, I have implemented its body based on RegOpenKeyEx(), but I'm new to CPython and need some help.

https://github.com/imba-tjd/cpython/tree/winreg