SDL2-CS on Mac M2 in Rider MAUI not found when using 'using' in C#

Question

I've had issues for a while now with reading a joystick/controller using SDL2 in C#.

I am using SDL2 for cross platform dev using MAUI for Mac and Windows

I tried to install SDL2 using brew: brew install sdl2 which installed successfully. Then I installed SDL-CS using NuGet, both in terminal and in the Rider NuGet Section, I checked and it is loaded into my csproj file already, yet the following code would return errors when building: using SDL2; When I built I would simply get this error:

0>JoystickPage.xaml.cs(1,7): Error CS0246 : The type or namespace name 'SDL2' could not be found (are you missing a using directive or an assembly reference?)
0>------- Finished building project: InfiniteConnect. Succeeded: False. Errors: 1. Warnings: 0

This is on minimal Verbose logging and diagnostics did not even say why, just that the build failed with one error.

I have tried to add lines into my csproj such as:


    <ItemGroup>
        <NativeLibrary Include="/opt/homebrew/opt/sdl2/lib/libSDL2.dylib" />
    </ItemGroup>
    <ItemGroup>
        <None Update="/opt/homebrew/opt/sdl2/lib/libSDL2.dylib">
            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
        </None>
    </ItemGroup>

But again nothing worked, I attempted other things but also nothing, maybe I am not doing it right.

brew --prefix sdl2

simply returns the correct directory:

/opt/homebrew/opt/sdl2

I added DYLD_LIBRARY_PATH=/opt/homebrew/opt/sdl2/lib:$DYLD_LIBRARY_PATH to environment variables in maccatalyst which is what I am using to run with.

Am I missing something? I restarted Rider and cleaned and rebuilt every time.

EDIT: Here is where I target the libraries;

    <ItemGroup>
        <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
        <PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />
        <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0" />
        <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
        <PackageReference Include="SDL2-CS" Version="2.0.0" />
    </ItemGroup>

Are you trying to reference native libraries and use them as managed ones? Cause that's not how it works. — Blindy
– Blindy, Commented Aug 28, 2024 at 15:37
@Blindy I am not to sure to be honest! I tried to research on sdl2 with C# but there was honestly nothing, so that’s what chat gpt and GitHub AI told me — robinb
– robinb, Commented Aug 28, 2024 at 15:57
Your error is about C# code, so the problem is with how you include the .Net SDL package (SDL-CS in your case). Everything else isn't relevant, you're just polluting your question with noise. In fact, you don't even show how you reference the package. — Blindy
– Blindy, Commented Aug 28, 2024 at 15:58

Blindy · Accepted Answer · 2024-08-28 18:08:44Z

1

You're still missing relevant information (specifically, what complete .Net framework you're binding against), but if we assume that you're using .Net Core then the package you want is SDL2-CS.NetCore:

Whereas SDL2-CS runs against the legacy .Net Framework:

answered Aug 28, 2024 at 18:08

Blindy

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3 Comments

robinb Over a year ago

Ah ok sorry, I am using .NET 8.0

robinb Over a year ago

I have now managed! However, If I run my code with: using SDL2 and then initialise SDL2, it gives me a huge error about tried: '/opt/homebrew/lib/libSDL2.dll' (no such file) even though I want it to use dydl and not dll, how can I make it do this? If I however do: [DllImport("/opt/homebrew/lib/libSDL2.dylib", EntryPoint = "SDL_Init")] in my code without using SDL2 it works.

Blindy Over a year ago

That I don't know, I use neither SDL nor MacOS.

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