Example C#

using System;
using System.Runtime.InteropServices;
 
namespace SimulatedReality
{
    [StructLayout(LayoutKind.Sequential)]
    public struct SR_handPose
    {
        public ulong frameId;
        public ulong time;
        public ulong handId;
        public ulong side;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3*21)]
        public double[] joints;
    }
 
    public static class SR
    {
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate void acceptHandPoseCallback(SR_handPose handPose);
 
#if WIN64
        [DllImport("SimulatedRealityCore.dll")]
        public extern static IntPtr newSRContext();
        [DllImport("SimulatedRealityCore.dll")]
        public extern static void initializeSRContext(IntPtr context);
        [DllImport("SimulatedRealityCore.dll")]
        public extern static void deleteSRContext(IntPtr context);
        [DllImport("SimulatedRealityHandTrackers.dll")]
        public extern static IntPtr createHandTracker(IntPtr context);
        [DllImport("SimulatedRealityHandTrackers.dll")]
        public extern static IntPtr createHandPoseListener(IntPtr handTracker, acceptHandPoseCallback callback);
        [DllImport("SimulatedRealityHandTrackers.dll")]
        public extern static void deleteHandPoseListener(IntPtr handPoseListener);
#else
        [DllImport("SimulatedRealityCore32.dll")]
        public extern static IntPtr newSRContext();
        [DllImport("SimulatedRealityCore32.dll")]
        public extern static void initializeSRContext(IntPtr context);
        [DllImport("SimulatedRealityCore32.dll")]
        public extern static void deleteSRContext(IntPtr context);
        [DllImport("SimulatedRealityHandTrackers32.dll")]
        public extern static IntPtr createHandTracker(IntPtr context);
        [DllImport("SimulatedRealityHandTrackers32.dll")]
        public extern static IntPtr createHandPoseListener(IntPtr handTracker, acceptHandPoseCallback callback);
        [DllImport("SimulatedRealityHandTrackers32.dll")]
        public extern static void deleteHandPoseListener(IntPtr handPoseListener);
#endif
    }
}

using System;
using SimulatedReality;
 
namespace example_cpp
{
    class Program
    {
        static void Main(string[] args)
        {
            SR.acceptHandPoseCallback acceptHandPose = (SR_handPose handPose) =>
            {
                Console.WriteLine(handPose.joints[0]);
            };
 
            var context = SR.newSRContext();
            var handTracker = SR.createHandTracker(context);
            var handPoseListener = SR.createHandPoseListener(handTracker, acceptHandPose);
            SR.initializeSRContext(context);
 
            Console.ReadKey();
 
            SR.deleteHandPoseListener(handPoseListener);
            SR.deleteSRContext(context);
        }
    }
}