Unable to build on ubuntu 20.04

[CpBobette]

Summary of your issue

I am trying to setup my for .net6 on ubuntu 20.04, I was unable to build from source (probably from missing dependencies but I just gave up). I am now trying to go the docker way but once again the DockerFile fails on the OpencvSharp build with errors related to wechat_qrcode.

/opencvsharp/src/OpenCvSharpExtern/include_opencv.h:64:10: fatal error: opencv2/wechat_qrcode.hpp: No such file or directory

Environment

ubuntu 20.04

[CpBobette]

#1389

[64J0]

Cool, I'm trying to use it in Ubuntu 20.04 as well and it is not working either. Getting this message:

Unhandled exception. System.TypeInitializationException: The type initializer for 'OpenCvSharp.Internal.NativeMethods' threw an exception.
 ---> System.DllNotFoundException: Unable to load shared library 'OpenCvSharpExtern' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: libOpenCvSharpExtern: cannot open shared object file: No such file or directory
   at OpenCvSharp.Internal.NativeMethods.redirectError(CvErrorCallback errCallback, IntPtr userdata, IntPtr& prevUserdata)
   at OpenCvSharp.Internal.ExceptionHandler.RegisterExceptionCallback()
   at OpenCvSharp.Internal.NativeMethods.LoadLibraries(IEnumerable`1 additionalPaths)
   at OpenCvSharp.Internal.NativeMethods..cctor()
   --- End of inner exception stack trace ---
   at OpenCvSharp.Internal.NativeMethods.videoio_VideoCapture_new3(Int32 device, Int32 apiPreference, IntPtr& returnValue)
   at OpenCvSharp.VideoCapture..ctor(Int32 index, VideoCaptureAPIs apiPreference)
   at <StartupCode$example-opencv>.$Program.main@() in /home/gajo/Desktop/codes/example-opencv/Program.fs:line 3

[CpBobette]

You need to have OpenCvSharpExtern in your path or in your bin, have a look into the dockerfile, it will provide the instructions needed to build OpenCv and the wrapper library from source. You can than reference the compiled file in your project. I find using docker much easier when working with OpenCvSharp on ubuntu.

[64J0]

Cool, thanks for the tip @CpBobette