Can't load ImageMagick API on Windows 8.1

[marekstodolny]

Traceback (most recent call last):
  File "C:\Python34\lib\site-packages\wand\api.py", line 150, in <module>
    libraries = load_library()
  File "C:\Python34\lib\site-packages\wand\api.py", line 107, in load_library
    raise IOError('cannot find library; tried paths: ' + repr(tried_paths))
OSError: cannot find library; tried paths: ['C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_HDRI.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-6.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-6HDRI.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-Q16.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-Q16HDRI.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-Q8.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-Q8HDRI.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-6.Q16.dll', 'C:\\Program Files\\ImageMagick-6.9.1-Q16\\CORE_RL_wand_-6.Q16HDRI.dll']

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:/processing/plyty/plyty.py", line 1, in <module>
    from wand.image import Image
  File "C:\Python34\lib\site-packages\wand\image.py", line 20, in <module>
    from .api import MagickPixelPacket, libc, libmagick, library
  File "C:\Python34\lib\site-packages\wand\api.py", line 176, in <module>
    'Try to install:\n  ' + msg)
ImportError: MagickWand shared library not found.
You probably had not installed ImageMagick library.
Try to install:
  http://docs.wand-py.org/en/latest/guide/install.html#install-imagemagick-on-windows

Process finished with exit code 1

Path is proper and libraries exist.

I tried to hardcode the paths and files in api.py, but had no success at all.

This is just plain weird.

[emcconville]

And both Python & ImageMagick are matching x86, or x86_64 architectures?

[marekstodolny]

Yeah, they both match x86_64.
I'll check if x86 works.

Is it possible that this issue could be caused by NTFS filesystem permissions?

[marekstodolny]

Well, it's not working.

ImageMagick 6.9.1 x86
Python 3.4.3 x86

[roelandschoukens]

The issue is finding the required DLL libraries. In standard ImageMagick installations they are not in the PATH or MAGICK_HOME variable, but they're found in the paths listed in the windows registry under HKEY_LOCAL_MACHINE\SOFTWARE\ImageMagick\Current

Note that the coder and filter DLL modules are found in subdirectories of the installation.

I have patched api.py to find those paths on my system. I'm not sure how it works on other systems:

libwand = None
system = platform.system()
magick_home = os.environ.get('MAGICK_HOME')

# on Windows we're going to need to add some paths for the DLL loader
if system == 'Windows':
    dll_load_paths = []
    # read paths to coder and filter modules from registry if possible
    try:
        with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"SOFTWARE\ImageMagick\Current") as reg_key:
            libPath    = winreg.QueryValueEx(reg_key, "LibPath")
            coderPath  = winreg.QueryValueEx(reg_key, "CoderModulesPath")
            filterPath = winreg.QueryValueEx(reg_key, "FilterModulesPath")
            magick_home = libPath[0]
            dll_load_paths = [libPath[0], coderPath[0], filterPath[0]]
    except:
        # otherwise use MAGICK_HOME
        if magick_home:
            dll_load_paths = [magick_home]

    if dll_load_paths:
        os.environ['PATH'] = os.environ['PATH'] + ';' + ';'.join(dll_load_paths)

This of course requires importing winreg. I have inserted this in the find_library function, but I saw that was refactored since the last release.

[emcconville]

Closing this. Issues appears to be resolved in previous releases