1.Create a new project

2.Select the project type(Console App .NET Framework)

3.Configure the new project

4.Right click the project->Add->New Folder

To create a new folder and named “tobii”

5.Copy this three folders of stream engine to “tobii”

6.If the folder turns gray, just right click and select “Include In Project”

7.Copy the sample script below into Program.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using Tobii.StreamEngine;

namespace Tobii.StreamEngine.Sample
{
    public static class StreamSample
    {
        private static void OnGazePoint(ref tobii_gaze_point_t gazePoint, IntPtr userData) 
        {
            // Check that the data is valid before using it
            if(gazePoint.validity == tobii_validity_t.TOBII_VALIDITY_VALID) 
            {
                Console.WriteLine($"Gaze point: {gazePoint.position.x}, {gazePoint.position.y}");
            }
        }

        public static void Main()
        {
            // Create API context
            IntPtr apiContext;
            tobii_error_t result = Interop.tobii_api_create(out apiContext, null);
            Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);

            // Enumerate devices to find connected eye trackers
            List<string> urls;
            result = Interop.tobii_enumerate_local_device_urls(apiContext, out urls);
            Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);
            if(urls.Count == 0)
            {
                Console.WriteLine("Error: No device found");
                return;
            }

            // Connect to the first tracker found
            IntPtr deviceContext;
            result = Interop.tobii_device_create(apiContext, urls[0], Interop.tobii_field_of_use_t.TOBII_FIELD_OF_USE_STORE_OR_TRANSFER_FALSE, out deviceContext);
            Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);

            // Subscribe to gaze data
            result = Interop.tobii_gaze_point_subscribe(deviceContext, OnGazePoint);
            Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);

            // This sample will collect 1000 gaze points
            for ( int i=0; i<1000; i++ )
            {
                // Optionally block this thread until data is available. Especially useful if running in a separate thread.
                Interop.tobii_wait_for_callbacks(new [] { deviceContext });
                Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR || result == tobii_error_t.TOBII_ERROR_TIMED_OUT);
                
                // Process callbacks on this thread if data is available
                Interop.tobii_device_process_callbacks(deviceContext);
                Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);
            }

            // Cleanup
            result = Interop.tobii_gaze_point_unsubscribe(deviceContext);
            Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);
            result = Interop.tobii_device_destroy(deviceContext);
            Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);
            result = Interop.tobii_api_destroy(apiContext);
            Debug.Assert(result == tobii_error_t.TOBII_ERROR_NO_ERROR);
        }
    }
}

8.Modify Tobii.StreamEngine.Interop.cs, Line 22:  public const string stream_engine_dll = “tobii\\lib\\tobii\\tobii_stream_engine”;

9.Comment out Tobii.StreamEngine.Interop.cs, Lines 487 & 488
//[DllImport(stream_engine_dll, CallingConvention = CallingConvention.Cdecl, EntryPoint = “tobii_calibration_stimulus_points_get”)]
//public static extern tobii_error_t tobii_calibration_stimulus_points_get(IntPtr device, out tobii_calibration_stimulus_points_t stimulus_points);

10.In VS Solution Explorer, find the tobii_stream_engine.dll and set copy to output directory as “Copy Always”

10.Set Build Target to x64

11.Start and receive the gaze data!