Missing files for `magic` library on Windows

问题

I need to get mime type for some files on windows, so i've installed python-magic (on 32-bit python 2.7.3).
It depends on unix magic library.
Author instructs to get regex2.dll, zlib1.dll and magic1.dll from gnuwin32 project. So i saved the files to a folder and added the folder to my system PATH.
Now when i execute magic methods, i get missing file exception:

import magic
print(magic.Magic())

Traceback (most recent call last):
File "C:/Users/Admin/PycharmProjects/lex/lex.py", line 367, in <module>
  test_magic()
File "C:/Users/Admin/PycharmProjects/lex/lex.py", line 364, in test_magic
  print(magic.Magic())
File "C:\Python27\lib\site-packages\python_magic-0.4.3-py2.7.egg\magic.py", line 52, in __init__
  magic_load(self.cookie, magic_file)
File "C:\Python27\lib\site-packages\python_magic-0.4.3-py2.7.egg\magic.py", line 188, in magic_load
  return _magic_load(cookie, coerce_filename(filename))
File "C:\Python27\lib\site-packages\python_magic-0.4.3-py2.7.egg\magic.py", line 139, in errorcheck
  raise MagicException(err)
magic.MagicException: could not find any magic files!

DLLs are in the PATH, i tried debugging and magic1.dll is located correctly, but somewhere inside library throws an exception.
Inside the gnuwin32 package i've found magic and magic.mgc. I placed them to the same folder, and got WindowsError: [Error 126] on

libmagic = None  
# Let's try to find magic or magic1  
dll = ctypes.util.find_library('magic') or ctypes.util.find_library('magic1')  

# This is necessary because find_library returns None if it doesn't find the library
if dll:
    libmagic = ctypes.CDLL(dll)

This obviously happens because python tries to open magic file as dll, which is plain text. After adding .dll to filenames in the code i get the same magic.MagicException: could not find any magic files!.
What files am i missing?

UPDATE:

C:\Users\Admin>file C:\123.zip -m magic
file: could not find any magic files!

C:\Users\Admin>file C:\123.zip -m "C:\@DEV\@LIB\@Magic\GetGnuWin32\bin\magic"
C:\123.zip; ASCII text, with no line terminators

C:\Users\Admin>cd C:\@DEV\@LIB\@Magic\GetGnuWin32\bin

C:\@DEV\@LIB\@Magic\GetGnuWin32\bin>file C:\123.zip -m magic
C:\123.zip; ASCII text, with no line terminators

UPDATE 2 (SOLVED):

print(magic.Magic())
magic.MagicException: could not find any magic files!

print(magic.Magic(magic_file = 'magic'))
<magic.Magic instance at 0x02A5E198>

just had to specify file explicitly

回答1:

For future google visitors: Another solution is setting the %MAGIC% enviroment variable in the systems setting to point to the magic file, for me it was:

"c:\Program Files (x86)\GnuWin32\share\misc\magic"

No need to hardcode the path in your program!

回答2:

Path to magic file has to be explicitly passed to the constructor.

magic_object = magic.Magic(magic_file = 'path_to_magic_files/magic'))

回答3:

As the python-magic problems seems to be quite common, here a working solution fo future googlers: After testing most solutions without altering the source-code, I found the following to get python-magic working out of the box:

Install GnuWin32 file first
Set the environment variable MAGIC=path\to\gnuwin32\share\misc\magic
Assure all installed executables/libraries to be accessible via the PATH
Install python-magic via pip

来源：https://stackoverflow.com/questions/14761961/missing-files-for-magic-library-on-windows

标签

python

windows

gnuwin32

python-magic