C# toolchain under Linux

Sebastian · November 2021

Dear all,

in my spare time I am trying to learn how to generate custom functionality with Bricscad v22 under Linux using C#, since I see myself incapable of learning Brx syntax. My developing background is irregular so the question might be to nooby for some to answer. As I keep telling my children, that there are no stupid questions, so I pose mine as follows.

1#On Ubuntu the Bricscad installation resides under /opt/bricsys/bricscad/v22
2#SDK has been uncompressed to /opt/bricsys/BRXSDK_Bcad_V22_1_04
3#.profile has been extended with

export BRX22_SDK_PATH="/opt/bricsys/BRXSDK_Bcad_V22_1_04"
export BRX_PATH="/opt/bricsys/BRXSDK_Bcad_V22_1_04"

4#Compiler is installed via apt-get install dotnet-sdk-5.0
5#Trying to compile samples/CsBrxMgdCivil with dotnet msbuild /t:Build /p:Configuration=Release does not work out of the box
6#A fresh project is set up using dotnet new console --framework net5.0
7#It compiles smoothly using dotnet msbuild /t:Build /p:Configuration=Release
8#The sample from 5# contains reference includes for BrxMgd and TD_Mgd, which I am unable to resemble in the csproj file. I undergo the assumption that the dynamic library should reside in 1#, but I cannot find it. Variations of below syntax do not work.

  <ItemGroup>
    <Reference Include="BrxMgd">
      <HintPath>/opt/bricsys/bricscad/v22/libbrx22.so</HintPath>
      <Private>False</Private>
    </Reference>
  </ItemGroup>

Any hints are appreciated, even if it's the that C# + Bricscad + Linux might not be possible.

Best regards

Sebastian

cadmaster · November 2021

"With BricsCAD V21, the supported .NET framework version is 4.5.1 (CLR version 4)"
It is a Windows only - .NET Core and now .NET 5 are multiplatform.

Sebastian · November 2021

@cadmaster

I am able to do

using System;
using System.Text;
using System.Runtime.InteropServices;

namespace CS
{
    class Program
    {

        [System.Security.SuppressUnmanagedCodeSecurity]
        [DllImport("libbrx22.so", CharSet = CharSet.Auto,
            CallingConvention = CallingConvention.Cdecl)]
        internal static extern int acedGetEnv(string envName, StringBuilder ReturnValue);

        public static string GetEnv(string envName)
        {
            StringBuilder buf = new StringBuilder(2048);
            acedGetEnv(envName, buf);
            return buf.ToString();
        }

        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

Since the compiler does not throw an error I presume that libbrx22.so is found. When I then publish

dotnet publish --configuration Release --framework net5.0

or

dotnet publish --self-contained -r linux-x64 --no-dependencies

and try to load the resulting output I receive the error

: APPLOAD
Loading /home/sebastian/Dokumente/BricsCAD/CS/bin/Debug/net5.0/linux-x64/CS.dll
Error loading "/home/sebastian/Dokumente/BricsCAD/CS/bin/Debug/net5.0/linux-x64/CS.dll": 
/home/sebastian/Dokumente/BricsCAD/CS/bin/Debug/net5.0/linux-x64/libCS.so: cannot open shared object file: No such file or directory.
/home/sebastian/Dokumente/BricsCAD/CS/bin/Debug/net5.0/linux-x64/CS.dll loading failed.

So in my understanding I conclude, that it seems possible to import functionality from a shared object library from the install, but that either the compilation path is wrong, or that loading of dotnet libraries does not work. I am grateful for further comments.

C# toolchain under Linux

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