[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Eryk Sun]

Changes by Eryk Sun :


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status: pending -> closed

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Eryk Sun]

Changes by Eryk Sun :


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resolution:  -> out of date
stage:  -> resolved
status: open -> pending

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Mark Lawrence]

Changes by Mark Lawrence :


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nosy:  -BreamoreBoy

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Sophist]

Sophist added the comment:

http://stackoverflow.com/questions/23125857/python-os-path-exists-cant-locate-the-file-however-the-file-indeed-exsits
 gave me an explanation:

That when running 32-bit apps on Win 64 C:\Windows\SysWOW64 is mapped to 
C:\Windows\system32.

Copying the missing DLL to SysWOW64 made it work.

NOTE: Original report was for 64-bit on 64-bit, so this is not necessarily an 
explanation of the original issue.

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Sophist]

Changes by Sophist :


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versions:  -Python 3.7

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Sophist]

Changes by Sophist :


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versions: +Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Sophist]

Sophist added the comment:

Finding it impossible for PIP to install discid.

Tracked it down to this issue i.e. 
os.path.isfile('C:\Windows\system32\discid.dll') == False when the dll exists.

Some other dlls in that directory result in True and some in False. I cannot 
see any significant difference in security permissions that might cause this - 
only difference is security permissions for some are inherited and some are not 
inherited.

I get this on both Python 3.6.1 32-bit and 2.7.13 32-bit on Win 10 Pro 64-bit 
Anniversary Edition 1607. I use ESET Smart Security 9 as AV.

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nosy: +Sophist

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Mark Lawrence]

Mark Lawrence added the comment:

Works fine for me.

Python build: 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:38:22) [MSC v.1600 32 
bit (Intel)]
Path 'C:\Windows\system32' exists in $PATH: True
File 'C:\Windows\system32\acledit.dll' exists: True
ctypes says for 'acledit.dll': C:\Windows\system32\acledit.dll
ctypes says for 'acledit': C:\Windows\system32\acledit.dll

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components: +Windows
nosy: +BreamoreBoy

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[vyrus]

Changes by vyrus piq...@gmail.com:


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nosy: +loewis, vyrus

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Meador Inge]

Changes by Meador Inge mead...@gmail.com:


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nosy: +meador.inge

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[issue16283] ctypes.util.find_library does not find all DLLs anymore

[Marcus von Appen]

New submission from Marcus von Appen:

ctypes.util.find_library does not seem to be able to find certain libraries in 
Python3.3 on Win32 platforms anymore, if the library suffix is omitted. For 
some reason, os.path.isfile() in ctypes.util.find_library returns False in 
those cases.

Please try out the attached test script. This produces the following output on 
a Windows 7 x64 system for me (given that a OpenAL32.dll is installed):


C:\c:\Python27-x64\python.exe ct_test.py

Python build: 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)]
Path 'C:\Windows\system32' exists in $PATH: True
File 'C:\Windows\system32\OpenAL32.dll' exists: True
ctypes says for 'OpenAL32.dll': C:\Windows\system32\OpenAL32.dll
ctypes says for 'OpenAL32': C:\Windows\system32\OpenAL32.dll


C:\c:\Python31-x64\python.exe ct_test.py

Python build: 3.1.4 (default, Jun 12 2011, 14:16:16) [MSC v.1500 64 bit (AMD64)]
Path 'C:\Windows\system32' exists in $PATH: True
File 'C:\Windows\system32\OpenAL32.dll' exists: True
ctypes says for 'OpenAL32.dll': C:\Windows\system32\OpenAL32.dll
ctypes says for 'OpenAL32': C:\Windows\system32\OpenAL32.dll

C:\c:\Python32-x64\python.exe ct_test.py

Python build: 3.2.3 (default, Apr 11 2012, 07:12:16) [MSC v.1500 64 bit (AMD64)]
Path 'C:\Windows\system32' exists in $PATH: True
File 'C:\Windows\system32\OpenAL32.dll' exists: True
ctypes says for 'OpenAL32.dll': C:\Windows\system32\OpenAL32.dll
ctypes says for 'OpenAL32': C:\Windows\system32\OpenAL32.dll

C:\c:\Python33-x64\python.exe ct_test.py

Python build: 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:57:17) [MSC v.1600 64 
bit (AMD64)]
Path 'C:\Windows\system32' exists in $PATH: True
File 'C:\Windows\system32\OpenAL32.dll' exists: True
ctypes says for 'OpenAL32.dll': C:\Windows\system32\OpenAL32.dll
ctypes says for 'OpenAL32': None

--
components: ctypes
files: ct_test.py
messages: 173315
nosy: marcusva
priority: normal
severity: normal
status: open
title: ctypes.util.find_library does not find all DLLs anymore
type: behavior
versions: Python 3.3
Added file: http://bugs.python.org/file27618/ct_test.py

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