Created
April 24, 2012 07:57
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Python module for loading the latest version of COM typelibs.
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""" | |
Useful functions for loading the latest version | |
of a typelib given just its IID. | |
- James Brotchie <brotchie@gmail.com> (github.com/brotchie) | |
""" | |
from win32com.client import gencache | |
from _winreg import OpenKey, HKEY_CLASSES_ROOT, QueryInfoKey, EnumKey | |
def GetTypelibVersions(IID): | |
""" | |
Returns the list of installed versions of a | |
given typelib. Versions are returned as a list | |
of two element tuples of the form (major, minor) | |
where major, minor are integers. | |
""" | |
versions = [] | |
with OpenKey(HKEY_CLASSES_ROOT, 'Typelib\\' + IID) as key: | |
subkeycount, _, _ = QueryInfoKey(key) | |
for i in range(subkeycount): | |
rawversion = EnumKey(key, i) | |
# We're only interested in subkeys of the form | |
# MAJORVERSION.MINORVERSION | |
if rawversion.count('.') != 1: | |
continue | |
rawmajor, rawminor = rawversion.split('.') | |
# Versions are expressed in hex. | |
major, minor = int(rawmajor, 16), int(rawminor, 16) | |
versions.append((major, minor)) | |
return versions | |
def GetTypelibLatestVersion(IID): | |
""" | |
Returns a 2 element tuple containing the latest | |
major and minor version of the given typelib. Returns | |
(None, None) if the typelib wasn't found. | |
""" | |
versions = GetTypelibVersions(IID) | |
versions.sort() | |
return versions[-1] if versions else (None, None) | |
def EnsureLatestVersion(IID): | |
""" | |
Returns the win32com wrapped module for the | |
latest version of the given typelib. | |
The Python wrapper will be generated if it | |
doesn't already exist. | |
""" | |
major, minor = GetTypelibLatestVersion(IID) | |
if major: | |
return gencache.EnsureModule(IID, 0, major, minor) | |
else: | |
return None |
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