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Using ctypes with Windows API to get FileVersion of a file

P: n/a
I need to get the FileVersion of some files on Windows. The best way
look like to use function GetFileVersionInfo from the Windows API. I
first try with pywin32 and it work well, but with ctypes now included
in Python 2.5, use it look like a good idea.
So I write the code below that work fine, but I'm not sure it's the
best way to do what I want.
My main concern is about the codepages extraction: could I use a struct
to make the job ?
Codepages is actually an array of struct, how could I use ctypes to
extract it ?

Thanks for your comments and advices.

import array
from ctypes import *

def get_file_info(filename, info):
Extract information from a file.
# Get size needed for buffer (0 if no info)
size = windll.version.GetFileVersionInfoSizeA(filename, None)
# If no info in file -empty string
if not size:
return ''
# Create buffer
res = create_string_buffer(size)
# Load file informations into buffer res
windll.version.GetFileVersionInfoA(filename, None, size, res)
r = c_uint()
l = c_uint()
# Look for codepages
windll.version.VerQueryValueA(res, '\\VarFileInfo\\Translation',
byref(r), byref(l))
# If no codepage -empty string
if not l.value:
return ''
# Take the first codepage (what else ?)
codepages = array.array('H', string_at(r.value, l.value))
codepage = tuple(codepages[:2].tolist())
# Extract information
windll.version.VerQueryValueA(res, ('\\StringFileInfo\\%04x%04x\\'
+ info) % codepage,
byref(r), byref(l))
return string_at(r.value, l.value)

print get_file_info(r'C:\WINDOWS\system32\calc.exe', 'FileVersion')

Nov 14 '06 #1
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