CODEWITHSUNDEEP
pythonipythonshared-librarieslibrary-path
SebMa
SebMa

Reputation: 4727

"Apple Python" : OSError: dlopen(libps2000a.dylib, 6): image not found but not in IPython

On Macos, I have set DYLD_LIBRARY_PATH this way:

export DYLD_LIBRARY_PATH=/Applications/PicoScope6.app/Contents/Resources/lib

If I run those two lines in IPython, it works :

from ctypes import cdll
cdll.LoadLibrary("libps2000a.dylib")

but I run them in the standard python interpreter, I get :

$ /usr/bin/python
Python 2.7.10 (default, Feb  7 2017, 00:08:15)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from ctypes import cdll
>>> cdll.LoadLibrary("libps2000a.dylib")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py", line 443, in LoadLibrary
    return self._dlltype(name)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: dlopen(libps2000a.dylib, 6): image not found

EDIT1 : I think it has something to with the Python provided by Apple because with /usr/local/bin/python2 (provided by the brew utility), it works :

$ /usr/local/bin/python2
Python 2.7.13 (default, Jul 18 2017, 09:17:00)
[GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.42)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from ctypes import cdll
>>> cdll.LoadLibrary("libps2000a.dylib")
<CDLL 'libps2000a.dylib', handle 7f8838d01f80 at 10b438f50>

EDIT2 : I have the same pb. with the DYLD_LIBRARY_PATH variable as with the LD_LIBRARY_PATH variable

What can I do to "tell" the "Apple Python" to "see" the DYLD_LIBRARY_PATH ?

Upvotes: 0

Views: 1561

Answers (1)

Graham Dumpleton
Graham Dumpleton

Reputation: 58543

On MacOS X it is DYLD_LIBRARY_PATH not LD_LIBRARY_PATH.

See the man page for dyld for details on environment variables you can set which affect the dynamic linker.

Upvotes: 1

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