OSError: Cannot find pyvips library (DLLs)

Question

I’m facing a problem where I can’t import pyvips as the OS doesn’t find the directory where all the DLLs are located.

>>> import pyvips
Traceback (most recent call last):
  File "C:Usersistab.virtualenvsRPAS_DS_UI-v4ujo25hlibsite-packagespyvips__init__.py", line 19, in <module>
    import _libvips
ModuleNotFoundError: No module named '_libvips'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:Usersistab.virtualenvsRPAS_DS_UI-v4ujo25hlibsite-packagespyvips__init__.py", line 70, in <module>
    gobject_lib = ffi.dlopen(_gobject_libname)
  File "C:Usersistab.virtualenvsRPAS_DS_UI-v4ujo25hlibsite-packagescffiapi.py", line 150, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
  File "C:Usersistab.virtualenvsRPAS_DS_UI-v4ujo25hlibsite-packagescffiapi.py", line 832, in _make_ffi_library
    backendlib = _load_backend_lib(backend, libname, flags)
  File "C:Usersistab.virtualenvsRPAS_DS_UI-v4ujo25hlibsite-packagescffiapi.py", line 828, in _load_backend_lib
    return backend.load_library(path, flags)
OSError: cannot load library 'C:UsersistabRPAS_2RPAS_DS_UIvips-dev-8.13binlibgobject-2.0-0.dll': error 0x7e

I followed the documentation Here and added the bin folder to PATH yet the same problem occurs. And it is not my first time having problems with packages’ DLLs :’)

Any thoughts?

Asked By: thebluest

||

Source

Answer 1

This is a duplicate of [SO]: PyWin32 and Python 3.8.0 (@CristiFati’s answer), but i’m going to add some details.

[PyPI]: pyvips 2.2.1 (Non-conda install section) states:

To set PATH from within Python, you need something like this at the start:
import os
vipshome = 'c:\vips-dev-8.7\bin'
os.environ['PATH'] = vipshome + ';' + os.environ['PATH']
Now when you import pyvips, it should be able to find the DLLs.

This is no longer correct (starting with Python 3.8 – check the 1^st URL why).
But PyVIPS (v2.2.1 – latest at answer time) doesn’t support Python 3.8 (highest is v3.6).

For Python 3.8+ compatibility (and also maintaining the old one), the above snippet should be (text would also need some changes):

import os
add_dll_dir = getattr(os, "add_dll_directory", None)
vipsbin = r"c:vips-dev-8.7bin"  # LibVIPS binary dir
if callable(add_dll_dir):
    add_dll_dir(vipsbin)
else:
    os.environ["PATH"] = os.pathsep.join((vipsbin, os.environ["PATH"]))

import pyvips

Created [GitHub]: libvips/pyvips – Update install steps for Python 3.8+ to track this (fixed on 221003).

Answered By: CristiFati

Answer 2

Does not seem to work anymore after forced company windows10 21H2 update.
get: ModuleNotFoundError: No module named ‘pyvips’

Even installed latest python:

C:Usersmaja>python
Python 3.11.1 (tags/v3.11.1:a7a450f, Dec  6 2022, 19:58:39) [MSC v.1934 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.

Even installed vips-dev-8.13

Is it a 32/64 bit problem?

For some reason, which was not working yesterday, pyvips does install!?

C:DatatechtimeHouston>pip install pyvips
Collecting pyvips
  Using cached pyvips-2.2.1.tar.gz (633 kB)
  Preparing metadata (setup.py) ... done
Collecting cffi>=1.0.0
  Using cached cffi-1.15.1-cp311-cp311-win_amd64.whl (179 kB)
Collecting pycparser
  Using cached pycparser-2.21-py2.py3-none-any.whl (118 kB)
Installing collected packages: pycparser, cffi, pyvips
  DEPRECATION: pyvips is being installed using the legacy 'setup.py install' method, because it does not have a 'pyproject.toml' and the 'wheel' package is not installed. pip 23.1 will enforce this behaviour change. A possible replacement is to enable the '--use-pep517' option. Discussion can be found at https://github.com/pypa/pip/issues/8559
  Running setup.py install for pyvips ... done
Successfully installed cffi-1.15.1 pycparser-2.21 pyvips-2.2.1

Using proposed PATH include:

import os
add_dll_dir = getattr(os, "add_dll_directory", None)
vipsbin = r"c:vips-dev-8.13bin"  # LibVIPS binary dir
if callable(add_dll_dir):
    add_dll_dir(vipsbin)
else:
    os.environ["PATH"] = os.pathsep.join((vipsbin, os.environ["PATH"]))

import pyvips as py

Now I get:

Traceback (most recent call last):
  File "C:UsersmajaAppDataLocalProgramsPythonPython311Libsite-packagespyvips__init__.py", line 19, in <module>
    import _libvips
ModuleNotFoundError: No module named '_libvips'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:DatatechtimeHoustonhouston-compare-v2.py", line 15, in <module>
    import pyvips as py
  File "C:UsersmajaAppDataLocalProgramsPythonPython311Libsite-packagespyvips__init__.py", line 70, in <module>
    gobject_lib = ffi.dlopen(_gobject_libname)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersmajaAppDataLocalProgramsPythonPython311Libsite-packagescffiapi.py", line 150, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersmajaAppDataLocalProgramsPythonPython311Libsite-packagescffiapi.py", line 832, in _make_ffi_library
    backendlib = _load_backend_lib(backend, libname, flags)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersmajaAppDataLocalProgramsPythonPython311Libsite-packagescffiapi.py", line 827, in _load_backend_lib
    raise OSError(msg)
OSError: cannot load library 'libgobject-2.0-0.dll': error 0x7e.  Additionally, ctypes.util.find_library() did not manage to locate a library called 'libgobject-2.0-0.dll'

Guess what’s the solution: uninstalled python and installed v 3.6.8, then pyvips >>> works!

Answered By: maja

OSError: Cannot find pyvips library (DLLs)

Question:

Answers: