Can't import DocTest.VisualTest library

[TSavin]

Hi,

I've installed and used doctestlibrary on my personal computer and everything works fine. But after installing everything needed on another laptop, when i try to import DocTest.VisualTest library, it failed. Only this part of doctestlibrary : import of DocTest.PdfTest is ok and works . I've tried on python 3.7 and 3.9 also with same result.

Here is the error i get when i run it :

Importing library 'DocTest.VisualTest' failed: FileNotFoundError: Could not find module 'c:\python\lib\site-packages\pylibdmtx\libdmtx-64.dll' (or one of its dependencies). Try using the full path with constructor syntax. Traceback (most recent call last): File "c:\python\lib\site-packages\DocTest\VisualTest.py", line 1, in from DocTest.CompareImage import CompareImage File "c:\python\lib\site-packages\DocTest\CompareImage.py", line 19, in from pylibdmtx import pylibdmtx File "c:\python\lib\site-packages\pylibdmtx\pylibdmtx.py", line 10, in from .wrapper import ( File "c:\python\lib\site-packages\pylibdmtx\wrapper.py", line 70, in _dmtxVersion = libdmtx_function('dmtxVersion', c_char_p) File "c:\python\lib\site-packages\pylibdmtx\wrapper.py", line 58, in libdmtx_function return prototype((fname, load_libdmtx())) File "c:\python\lib\site-packages\pylibdmtx\wrapper.py", line 39, in load_libdmtx LIBDMTX = dmtx_library.load() File "c:\python\lib\site-packages\pylibdmtx\dmtx_library.py", line 40, in load libdmtx = cdll.LoadLibrary( File "c:\python\lib\ctypes__init__.py", line 452, in LoadLibrary return self._dlltype(name) File "c:\python\lib\ctypes__init.py", line 374, in init__ self._handle = _dlopen(self._name, mode) PYTHONPATH: C:\Python\Scripts\robot.exe C:\Python37 c:\python\python39.zip c:\python\DLLs c:\python\lib c:\python c:\python\lib\site-packages c:\python\lib\site-packages\win32 c:\python\lib\site-packages\win32\lib c:\python\lib\site-packages\Pythonwin C:\Python\lib\site-packages\robotide\contrib\testrunner../../lib

[manykarim]

Hi Tony, this seems to be caused by the missing "libdmtx-64.dll". This .dll is normally installed automatically, when pylibdmtx package is installed as a dependency. That problem occured to me, when installing the library via python setup.py install.

Two little things I would ask you to try: a) Install the robotframework-doctestlibrary via pip (and maybe force a reinstall) pip install --upgrade --force-reinstall robotframework-doctestlibrary b) Install pylibdmtx separately via pip pip install pylibdmtx

BR, Many

[TSavin]

Hi Many,

Thanks for your answer . I've check, and libdmtx-64.dll is at the right place. I've tried to uninstall / reinstall both of them without any success on python 3.9.2.

I'm trying to reinstall python 3.7.9 64 bit and all libraries because i've seen that libdmtx where not tested on python 3.9.

Fun fact, on my desktop, where the lib runs well, i don't have this directory : c:\python\lib\site-packages\DocTest\ ?

[manykarim]

I have the feeling that it is not related to python 3.9.X. So, the library libdmtx-64.dll is available in "c:\python\lib\site-packages\pylibdmtx\libdmtx-64.dll" but you still get that error message?

Maybe it is also related to a problem mentioned in the pylibdmtx project page: https://github.com/NaturalHistoryMuseum/pylibdmtx/#windows-error-message

Windows error message If you see an ugly ImportError when importing pylibdmtx on Windows you will most likely need the Visual C++ Redistributable Packages for Visual Studio 2013. Install vcredist_x64.exe if using 64-bit Python, vcredist_x86.exe if using 32-bit Python.

Or have you checked if the .dll is blocked for some reason? Just open the properties of the .dll file in Windows Explorer and check if it is maybe blocker. If yes, unblock it.

[manykarim]

Such an annoying .dll. It's in fact only needed to find data matrices, so it's only a rare use case anyway. Guess I should remove it from the "default" doctest library in the future...

[TSavin]

Many,

I've tried again on Python 3.7.9 - 64 bit- Reinstall all librairies. I've add also in system path the python directory: c:\Users****\AppData\Roaming\Python\Scripts. I don't have "c:\python\lib\site-packages\pylibdmtx\libdmtx-64.dll" error anymore but still can't add DocTest.VisualTest.

I'll try to install Visual C++ as mentionned.

[manykarim]

ok, weird. Thanks a lot for trying it out. What error do you get now?

[TSavin]

It just doesn't find this part of lib. DocTest.PdfTest is still running fine. dll files seems to be ok. I'm installing VC++ and reboot.

[manykarim]

By the way: If I see it correctly, you are not using a Virtual Python Environment, right?

And how did you instal the doctestlibrary on your system? Via pip? pip install robotframework-doctestlibrary

[TSavin]

Ok, it looks like you were right with VC++ ! Once i installed it and reboot, it works. Maybe you should add a comment on your installation tutorial ?

Thanks for helping and for your lib Many ;)

[manykarim]

wow, awesome. I will definitely add the comment to my documentation. Thanks a lot for trying it out!!

[TSavin]

I'll try to test it with python 3.9.2 - 64 bit.

EDIT : It works also on 3.9

[manykarim]

README.md has been updated.