DLL load failed on 3.4.2.1.16 and 3.4.2.17 versions (windows 7 x64)

[eggnot]

after:
import cv2

error:
ImportError: DLL load failed: The specified module could not be found.

but if:
pip install opencv-python==3.4.1.15

everything works just fine.

--
tested on
windows 7 x64, all updates, vs_redist++ 15, 17
python 3.6.5, 3.6.6, both x32 and x64 - error and behavior the same
opencv 3.4.1.15 and below seems working(tested on 3.4.0.12)

[skvark]

I don't have Windows 7 available right now but on Windows 10 everything seems to be working properly. You can check the cv2.cp36-win_amd64.pyd file with http://www.dependencywalker.com/ to see which dependency is missing (note: there will be many false positives in Dependecy Walker output).

[eggnot]

do you need text logs?

[skvark]

There is something odd going on with Windows. I don't know why the earlier versions work fine... maybe some new dependency was introduced in the new versions of OpenCV. However, as this issue suggests, API-MS-WIN-DOWNLEVEL-SHLWAPI-L1-1-0.DLL is probably missing: #116

Downloading arbitrary DLL files from the internet is not recommended. Instead, you should at least run sfc /scannow as an Administrator to see if there are issues with the system files (https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system). If that doesn't help, we need to figure out some other solution to this problem.

[hglee]

Install platform update (KB2670838) for API-MS-WIN-DOWNLEVEL-SHLWAPI-L1-1-0.DLL

See opencv issue #12010.

[skvark]

Thank you. I guess this issue can be closed.

[ShashiSingam]

after:
import cv2

error:
ImportError: DLL load failed: The specified module could not be found.

but if:
pip install opencv-python==3.4.1.15

everything works just fine.

--
tested on
windows 7 x64, all updates, vs_redist++ 15, 17
python 3.6.5, 3.6.6, both x32 and x64 - error and behavior the same
opencv 3.4.1.15 and below seems working(tested on 3.4.0.12)

Thank you very much eggnot it worked for me

[azhaoaigaga]

@eggnot Is this problem solved? I encountered the same problem in Windows server 2008 r2, but I had a lot fewer DLL and tried many methods. How did you solve it?

[eggnot]

@eggnot Is this problem solved? I encountered the same problem in Windows server 2008 r2, but I had a lot fewer DLL and tried many methods. How did you solve it?

was on old machine, can't check. i used depwalker to trace missing dll. can't remember exactly which are, sorry.