.NET MAUI iOS - System.DllNotFoundException: NcnnDotNetNative

[usmanakram-dev]

I've developed a .NET MAUI App and used "UltraFaceDotNet" for face detection.

It works fine in Android but when I try to execute the same code for iOS it return with following exception

{System.DllNotFoundException: NcnnDotNetNative
   at NcnnDotNet.Net..ctor()
   at UltraFaceDotNet.UltraFace..ctor(UltraFaceParameter parameter)
   at UltraFaceDotNet.UltraFace.Create(UltraFaceParameter parameter)
   at CamView.Services.DetectService..ctor() in {MY-PROJECT-PATH}\DetectService.cs:line 76}

Line # 76 is where it's trying to Create UltraFace object from provided parameters as following

var param = new UltraFaceParameter
       {
           BinFilePath = binPath,
           ParamFilePath = paramPath,
           InputWidth = 320,
           InputLength = 240,
           NumThread = 1,
           ScoreThreshold = 0.7f
       };

       this._UltraFace = UltraFace.Create(param);

Following are the libraries and files I've used

It also created link to following Libs

Can you please help to find out the issue?

Many Thanks

[andersonvieiragomeslopes]

Hi @ITBrainSol

I tried it on my iOS and it didn't work, but it also doesn't generate errors. Did you try adding this?

<MtouchExtraArgs>-gcc_flags "-lc++ -framework Metal"</MtouchExtraArgs>

I'll try adding it here and see if it works. It works fine on my Android, but not on iOS.

[zerokewl88]

Facing the same issue, and adding to the Additional Arguments suggestion above, didn't change the result.

Also, adding that to the .csproj file under the ios section, also didn't resolve this.

-gcc_flags "-lc++ -framework Metal"

[zerokewl88]

Trying to use and load UltraFaceDotNet (Xamarin) on Maui, and it works great on Android, but having trouble with the missing library for IOS.

Is there are tips / advice that you could give to get this to work please?

{System.DllNotFoundException: NcnnDotNetNative
   at NcnnDotNet.Net..ctor()
   at UltraFaceDotNet.UltraFace..ctor(UltraFaceParameter parameter)
   at UltraFaceDotNet.UltraFace.Create(UltraFaceParameter parameter)
.....

I've tried adding

This works for Android, but for IOS, having the above DLLNotFoundException being thrown.

[robitsrl]

Hello everybody,
any updates about the iOS problem ?
Thank's