DllNotFoundException: Unable to load DLL "OpenCvSharpExtern"

[QingmingLi-LQM]

Why when importing OpenCVSharp in the .NET Framework class library, it prompts DllNotFoundException: Unable to load DLL "OpenCvSharpExtern": The specified module cannot be found, but I have downloaded OpenCvSharpExtern.dll. I can use it normally in the .NET Framework Windows Forms project, but always report errors in the .NET Framework class library.

[suyashcjoshi]

I'm getting the same error on my Mac and looks like it's not build for M1 Apple Silicon architecture. Can the developer please fix that?

[Bartvelp]

I'm getting the same error on both linux-amd64 and linux-arm64. Even when adding the library manually using LD_LIBRARY_PATH=/snip/bin/Debug/net6.0/runtimes/ubuntu.18.04-x64/native/ it still gives the same error. When using ldd to check the required shared libraries it determines quite a few to be missing:

[10:03] bart@ubuntu:~/CsharpOpencv$ ldd bin/Debug/net6.0/runtimes/ubuntu.18.04-x64/native/libOpenCvSharpExtern.so
        linux-vdso.so.1 (0x00007ffd06bb2000)
        libtesseract.so.4 => not found
        libgtk-x11-2.0.so.0 => /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 (0x00007f231aa00000)
        libgdk-x11-2.0.so.0 => /lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 (0x00007f231af3f000)
        libcairo.so.2 => /lib/x86_64-linux-gnu/libcairo.so.2 (0x00007f231a8d8000)
        libgdk_pixbuf-2.0.so.0 => /lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0 (0x00007f231edfe000)
        libgobject-2.0.so.0 => /lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007f231aedd000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f231a79e000)
        libdc1394.so.22 => not found
        libavcodec.so.57 => not found
        libavformat.so.57 => not found
        libavutil.so.55 => not found
        libswscale.so.4 => not found
        libjpeg.so.8 => /lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007f231a71d000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f231aea5000)
        libtiff.so.5 => /lib/x86_64-linux-gnu/libtiff.so.5 (0x00007f231a692000)
        libIlmImf-2_2.so.22 => not found

Why is OpenCV not compiled statically and included like in opencv-python?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[hoangdung3498]

Why when importing OpenCVSharp in the .NET Framework class library, it prompts DllNotFoundException: Unable to load DLL "OpenCvSharpExtern": The specified module cannot be found, but I have downloaded OpenCvSharpExtern.dll. I can use it normally in the .NET Framework Windows Forms project, but always report errors in the .NET Framework class library.

do you solve it ?, i get same error with you