Python code to read registry

Question

from _winreg import *  """print r"*** Reading from SOFTWARE\Microsoft\Windows\CurrentVersion\Run ***" """ aReg = ConnectRegistry(None,HKEY_LOCAL_MACHINE)  aKey = OpenKey(aReg, r"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall") for i in range(1024):     try:         asubkey=EnumKey(aKey,i)         val=QueryValueEx(asubkey, "DisplayName")         print val     except EnvironmentError:         break 

Could anyone please correct the error...i just want to display the "DisplayName" within the subkeys of the key the HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall This is the error i get..

Traceback (most recent call last):   File "C:/Python25/ReadRegistry", line 10, in <module>     val=QueryValueEx(asubkey, "DisplayName") TypeError: The object is not a PyHKEY object 

Answer 1

Documentation says that EnumKey returns string with key's name. You have to explicitly open it with _winreg.OpenKey function. I've fixed your code snippet:

from _winreg import *  aKey = r"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall" aReg = ConnectRegistry(None, HKEY_LOCAL_MACHINE)  print(r"*** Reading from %s ***" % aKey)  aKey = OpenKey(aReg, aKey) for i in range(1024):     try:         asubkey_name = EnumKey(aKey, i)         asubkey = OpenKey(aKey, asubkey_name)         val = QueryValueEx(asubkey, "DisplayName")         print(val)     except EnvironmentError:         break 

Please note, that not every key has "DisplayName" value available.

Answer 2

What about x86 on x64? Use 64-bit Specific Types

What if there's more than 1024 sub-keys in "Uninstall"? Use _winreg.QueryInfoKey(key)

Python 2:

import errno, os, _winreg proc_arch = os.environ['PROCESSOR_ARCHITECTURE'].lower() proc_arch64 = os.environ['PROCESSOR_ARCHITEW6432'].lower()  if proc_arch == 'x86' and not proc_arch64:     arch_keys = {0} elif proc_arch == 'x86' or proc_arch == 'amd64':     arch_keys = {_winreg.KEY_WOW64_32KEY, _winreg.KEY_WOW64_64KEY} else:     raise Exception("Unhandled arch: %s" % proc_arch)  for arch_key in arch_keys:     key = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, r"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall", 0, _winreg.KEY_READ | arch_key)     for i in xrange(0, _winreg.QueryInfoKey(key)[0]):         skey_name = _winreg.EnumKey(key, i)         skey = _winreg.OpenKey(key, skey_name)         try:             print _winreg.QueryValueEx(skey, 'DisplayName')[0]         except OSError as e:             if e.errno == errno.ENOENT:                 # DisplayName doesn't exist in this skey                 pass         finally:             skey.Close() 

Python 3:

import errno, os, winreg proc_arch = os.environ['PROCESSOR_ARCHITECTURE'].lower() proc_arch64 = os.environ['PROCESSOR_ARCHITEW6432'].lower()  if proc_arch == 'x86' and not proc_arch64:     arch_keys = {0} elif proc_arch == 'x86' or proc_arch == 'amd64':     arch_keys = {winreg.KEY_WOW64_32KEY, winreg.KEY_WOW64_64KEY} else:     raise Exception("Unhandled arch: %s" % proc_arch)  for arch_key in arch_keys:     key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall", 0, winreg.KEY_READ | arch_key)     for i in range(0, winreg.QueryInfoKey(key)[0]):         skey_name = winreg.EnumKey(key, i)         skey = winreg.OpenKey(key, skey_name)         try:             print(winreg.QueryValueEx(skey, 'DisplayName')[0])         except OSError as e:             if e.errno == errno.ENOENT:                 # DisplayName doesn't exist in this skey                 pass         finally:             skey.Close()