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| # This scripts allows to get a list of all installed products in a windows
# machine. The code uses ctypes becuase there were a number of issues when
# trying to achieve the same win win32com.client
from collections import namedtuple
from ctypes import byref, create_unicode_buffer, windll
from ctypes.wintypes import DWORD
from itertools import count
# defined at http://msdn.microsoft.com/en-us/library/aa370101(v=VS.85).aspx
UID_BUFFER_SIZE = 39
PROPERTY_BUFFER_SIZE = 256
ERROR_MORE_DATA = 234
ERROR_INVALID_PARAMETER = 87
ERROR_SUCCESS = 0
ERROR_NO_MORE_ITEMS = 259
ERROR_UNKNOWN_PRODUCT = 1605
# diff propoerties of a product, not all products have all properties
PRODUCT_PROPERTIES = [u'Language',
u'ProductName',
u'PackageCode',
u'Transforms',
u'AssignmentType',
u'PackageName',
u'InstalledProductName',
u'VersionString',
u'RegCompany',
u'RegOwner',
u'ProductID',
u'ProductIcon',
u'InstallLocation',
u'InstallSource',
u'InstallDate',
u'Publisher',
u'LocalPackage',
u'HelpLink',
u'HelpTelephone',
u'URLInfoAbout',
u'URLUpdateInfo',]
# class to be used for python users :)
Product = namedtuple('Product', PRODUCT_PROPERTIES)
def get_property_for_product(product, property, buf_size=PROPERTY_BUFFER_SIZE):
"""Retruns the value of a fiven property from a product."""
property_buffer = create_unicode_buffer(buf_size)
size = DWORD(buf_size)
result = windll.msi.MsiGetProductInfoW(product, property, property_buffer,
byref(size))
if result == ERROR_MORE_DATA:
return get_property_for_product(product, property,
2 * buf_size)
elif result == ERROR_SUCCESS:
return property_buffer.value
else:
return None
def populate_product(uid):
"""Return a Product with the different present data."""
properties = []
for property in PRODUCT_PROPERTIES:
properties.append(get_property_for_product(uid, property))
return Product(*properties)
def get_installed_products_uids():
"""Returns a list with all the different uid of the installed apps."""
# enum will return an error code according to the result of the app
products = []
for i in count(0):
uid_buffer = create_unicode_buffer(UID_BUFFER_SIZE)
result = windll.msi.MsiEnumProductsW(i, uid_buffer)
if result == ERROR_NO_MORE_ITEMS:
# done interating over the collection
break
products.append(uid_buffer.value)
return products
def get_installed_products():
"""Returns a collection of products that are installed in the system."""
products = []
for puid in get_installed_products_uids():
products.append(populate_product(puid))
return products
def is_product_installed_uid(uid):
"""Return if a product with the given id is installed.
uid Most be a unicode object with the uid of the product using
the following format {uid}
"""
# we try to get the VersisonString for the uid, if we get an error it means
# that the product is not installed in the system.
buf_size = 256
uid_buffer = create_unicode_buffer(uid)
property = u'VersionString'
property_buffer = create_unicode_buffer(buf_size)
size = DWORD(buf_size)
result = windll.msi.MsiGetProductInfoW(uid_buffer, property, property_buffer,
byref(size))
if result == ERROR_UNKNOWN_PRODUCT:
return False
else:
return True |
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