Docker debian and opencvsharp - .Net Rest Api

[mapo80]

Hi everyone,

after many struggles I understood how to use Opencvsharp on debian dockerized .Net application. Here are steps:

• Compile everything using this dockerfile. It uses debian .net image and not ubuntu one

https://gist.github.com/mapo80/32a68cc1b797e9115ad73b6de8056394

• After compilation succeeded, all files are on container image in this folder:

/usr/lib/libOpenCvSharpExtern.so

• To have all dependencies run this command:

ldd libOpenCvSharpExtern.so

• Copy all dependencies in a folder:

mkdir opencv ldd libOpenCvSharpExtern.so | awk 'NF == 4 { system("cp " $3 " ./opencv") }' cp libOpenCvSharpExtern.so ./opencv

• Now you have all files needed to run libOpenCvSharpExtern.so

• Copy all these files on your host machine. Execute this from your host machine terminal:

docker cp docker_image_name:/usr/lib/opencv opencv

• You'll have all files on your host in this folder:

opencv

• Create 2 tar/gz files:

One only with libOpenCvSharpExtern.so (file_a.tar.gz) One for all other files contained in opencv folder (file_b.tar.gz)

• From docker file of your application add these lines:

`FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS base

WORKDIR / ADD file_b.tar.gz /usr/lib/x86_64-linux-gnu ADD file_a.tar.gz /usr/share/dotnet/shared/Microsoft.NETCore.App/7.0.3`

Following this steps you can use opencv from your asp.net api application ran on your docker image.

I hope you find this useful.

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