Entry
Is there an easy way of accessing the registry from within Python?
Aug 25th, 2009 16:41
Joe Bloggs, unknown unknown, Tom Vrankar
Below is a script written to queue Palm OS database files for
installation at the next HotSync. It makes several references to the
win32 extensions you can download from www.python.org. Look for
win32all: there's not much documentation, but this example _plus_ the
help files may be get you where you need to go.
#!/usr/local/bin/python
#@(#)heuristic to prepare files for installation at the next HotSync
20000507
import sys, os, string, re
import time, shutil, struct
import win32api, win32con
class PalmInstall:
# this always runs quietly, even if it can't figure everything out
def __init__ (self, user =None):
self.initialized =0
self.palmroot =win32con.HKEY_USERS
flag =0
# try to anticipate company name change in registry
for i in ["U.S. Robotics", "Palm Computing", "Palm", "Palm Inc."]:
# obtain the path to the Palm desktop installation
try:
self.palmcomm =".DEFAULT\\Software\\%s\\Pilot Desktop\\" %i
self.palmcore =self.palmcomm +"Core" # Path
key =win32api.RegOpenKeyEx (self.palmroot, self.palmcore,
0, win32con.KEY_READ)
self.path =win32api.RegQueryValueEx (key, "Path")[0]
win32api.RegCloseKey (key)
flag =1
break
except:
pass
if not flag: return
# prepare a key paths for processing below
self.palmpref =self.palmcomm +"Preferences" # LastUserName
self.palmsync =self.palmcomm +"HotSync Manager" # Install[0-9]+
# find Palm username of the last desktop user; this becomes the
default
if user:
self.user =user
else:
key =win32api.RegOpenKeyEx (self.palmroot, self.palmpref,
0, win32con.KEY_READ)
self.user =win32api.RegQueryValueEx (key, "LastUserName")[0]
win32api.RegCloseKey (key)
# really extract the secret install code from users.dat
# and set the user's install directory path
try:
self.setuser (self.user)
except:
return
# mark this instance initialized, and therefore useable
self.initialized =1
def setuser (self, user):
# extract secret install code from name of permanent key in standard
apps
# old way that was barely okay
# flag =0
# for kp in [self.palmmemo, self.palmaddr, self.palmdate,
self.palmtodo]:
# key =win32api.RegOpenKeyEx (self.palmroot, kp, 0,
win32con.KEY_READ)
# for i in range (64):
# try:
# name =win32api.RegEnumValue (key, i)[0]
# self.code =re.sub ("([0-9]+)_..portOrder", "\\1", name)
# if self.code !=name:
# flag =1
# break
# except:
# break
# win32api.RegCloseKey (key)
# if flag: break
# if not flag: return
# really extract the secret install code from users.dat
try:
f =open (os.path.join (self.path, "users.dat"), "rb")
usersdat =f.read()
f.close()
except:
raise ValueError, "Desktop not initialized: %s" %self.path
pos =13
for i in range (struct.unpack ("<H", usersdat[:2])[0]): # count
code, userlen =struct.unpack ("<H2xB", usersdat[pos:pos +5])
pos =pos +5
thisuser, dirlen =struct.unpack ("%dsB" %userlen,
usersdat[pos:pos +userlen +1])
pos =pos +userlen +1
userdir, flag =struct.unpack ("%dsB" %dirlen,
usersdat[pos:pos +dirlen +1])
pos =pos +dirlen +1
pos =pos +(flag and 42 or 10) # if flag is nonzero, next user
record
# starts 42 bytes later; else next user record starts 10
# bytes later
pos =pos +2 # skip first two (0x01, 0x80) bytes of subsequent
records
if thisuser ==user:
break
if thisuser !=user:
raise KeyError, "User not in desktop: %s" %user
self.user =user
self.code =code
self.userdir =userdir
# search all HotMgr subkeys for the default user's Install directory
# name, and form the path to this directory
key =win32api.RegOpenKeyEx (self.palmroot, self.palmsync,
0, win32con.KEY_READ)
for i in range (64):
try:
subkey =win32api.RegEnumKey (key, i)
key1 =win32api.RegOpenKeyEx (self.palmroot,
self.palmsync +"\\" +subkey,
0, win32con.KEY_READ)
try:
name =win32api.RegQueryValueEx (key1, "Name")[0]
if name =="Install":
self.idir =os.path.join (self.path, self.userdir,
win32api.RegQueryValueEx (key1, "Directory")[0])
win32api.RegCloseKey (key1)
break
except:
pass
win32api.RegCloseKey (key1)
except:
win32api.RegCloseKey (key)
return
win32api.RegCloseKey (key)
def install (self, path):
if (path[-4:] !=".pdb") and (path[-4:] !=".pqa") and (path[-4:]
!=".prc"):
raise ValueError, "File type is not Palm: %s" %os.path.basename
(path)
shutil.copy2 (path, self.idir)
key =win32api.RegOpenKeyEx (self.palmroot, self.palmsync,
0, win32con.KEY_WRITE)
win32api.RegSetValueEx (key, "Install%d" %self.code, 0,
win32con.REG_DWORD, 1)
win32api.RegCloseKey (key)
# test code
if __name__ =="__main__":
pi =PalmInstall()
print pi.user
print pi.code
print pi.idir
pi.setuser ("Blorg") # whoever you are
print pi.user
print pi.code
print pi.idir
pi.install ("csm0177u.prc") # whatever file you have
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