python读取注册表中值的方法

在Python的标准库中，_winreg.pyd可以操作Windows的注册表，另外第三方的win32库封装了大量的Windows API，使用起来也很方便。不过这里介绍的是使用_winreg操作注册表，毕竟是Python自带的标准库，无需安装第三方库。

下面的例子是通过Python获取Windows XP下已经安装的补丁号。Windows的补丁号都在“HKEY_LOCAL_MACHINE\SOFTWARE\\Microsoft\\Updates”下，通过循环下面所有的目录节点，如果找到的名称符合正则表达式KB(\d{6}).*，则表示是一个补丁号。

从例子可以看出操作起来非常的简单和快速。

# -*- coding: utf-8 -*-
# 获取Windows的已打的补丁号

from _winreg import *
import re

def subRegKey(key, pattern, patchlist):
    # 个数
    count = QueryInfoKey(key)[0]
    for index in range(count):
        # 获取标题
        name = EnumKey(key, index)
        result = patch.match(name)
        if result:
            patchlist.append(result.group(1))
        sub = OpenKey(key, name)
        subRegKey(sub, pattern, patchlist)
        CloseKey(sub)

if __name__ == '__main__':
    patchlist = []
    updates = 'SOFTWARE\\Microsoft\\Updates'
    patch = re.compile('(KB\d{6}).*')
    key = OpenKey(HKEY_LOCAL_MACHINE, updates)
    subRegKey(key, patch, patchlist)
    print 'Count: ' + str(len(patchlist))
    for p in patchlist:
        print p
    CloseKey(key)

下面内容转自 Python Standard Library12.13 The _winreg Module
(Windows only, New in 2.0) The _winreg module provides a basic interface to the Windows registry database. Example 12-17 demonstrates the module.

Example 12-17. Using the _winreg Module
File: winreg-example-1.py

import _winreg

explorer = _winreg.OpenKey(
    _winreg.HKEY_CURRENT_USER,
    "Software\\Microsoft\\Windows\CurrentVersion\\Explorer"
    )

#list values owned by this registry key 
try:
    i = 0
    while 1:
      name, value, type= _winreg.EnumValue(explorer, i)
      print repr(name),
      i += 1
except WindowsError:
    print

value, type = _winreg.QueryValueEx(explorer, "Logon User Name")

print
print "user is", repr(value)
'Logon User Name' 'CleanShutdown' 'ShellState' 'Shutdown Setting'
'Reason Setting' 'FaultCount' 'FaultTime' 'IconUnderline'...

user is u'Effbot'