Unity: DllNotFoundException: TobiiGazeCore64.dll

[Dieter Merkel]

Hi,

i am trying to build a program with Unity and GazeSDK.

I downloaded the Gaze SDK for .NET and copied the 64bit dlls into my unity-project root folder. But when i try to run the program in the editor i get the error:

DllNotFoundException: TobiiGazeCore64.dll
Tobii.Gaze.Core.EyeTrackerCoreLibrary.GetConnectedEyeTracker ()
TobiiData.Start () (at Assets/Tobii/TobiiData.cs:13)

Here is the Code:

using UnityEngine;
using System;
using System.Threading;
using System.Collections;
using Tobii.Gaze.Core;

public class TobiiData : MonoBehaviour {

	private IEyeTracker tracker;
	private Thread thread;
	private static GazeData lastGazeData;

	void Start () {
		Uri url = new EyeTrackerCoreLibrary().GetConnectedEyeTracker();
		tracker = new EyeTracker (url);
		tracker.EyeTrackerError += EyeTrackerError;
		tracker.GazeData += EyeTrackerGazeData;
		thread = CreateAndRunEventLoopThread(tracker);
		tracker.Connect();
		tracker.StartTracking();
		#if UNITY_EDITOR
		UnityEditor.EditorApplication.playmodeStateChanged = closeDLL;
		#endif
	}

	#if UNITY_EDITOR
	void closeDLL(){
		if ( !(UnityEditor.EditorApplication.isPlaying) && !(UnityEditor.EditorApplication.isPaused)){
			tracker.StopTracking();
			tracker.Disconnect();
			if (thread != null)
			{
				tracker.BreakEventLoop();
				thread.Join();
			}
		}
	}
	#endif

	/***************************************************************
	 * tobii functions to use the eye tracker via the eye gaze sdk *
	 * *************************************************************/
	
	private static string CoreLibraryVersion()
	{
		using (var lib = new EyeTrackerCoreLibrary())
		{
			return lib.LibraryVersion();
		}
	}
	
	private static Thread CreateAndRunEventLoopThread(IEyeTracker tracker)
	{
		var thread = new Thread(() =>
		                        {
			try
			{
				tracker.RunEventLoop();
			}
			catch (EyeTrackerException ex)
			{
				print("An error occurred in the eye tracker event loop: " + ex.Message);
			}
			
			print("Leaving the event loop.");
		});
		
		thread.Start();
		
		return thread;
	}
	
	private static void PrintDeviceInfo(IEyeTracker tracker)
	{
		var info = tracker.GetDeviceInfo();
		print(string.Format ("Serial number: {0}", info.SerialNumber));
		
		var trackBox = tracker.GetTrackBox();
		print(string.Format ("Track box front upper left ({0}, {1}, {2})", trackBox.FrontUpperLeftPoint.X, trackBox.FrontUpperLeftPoint.Y, trackBox.FrontUpperLeftPoint.Z));
	}
	
	private static void EyeTrackerGazeData(object sender, GazeDataEventArgs e)
	{
		lastGazeData = e.GazeData;
	}
	
	private static void EyeTrackerError(object sender, EyeTrackerErrorEventArgs e)
	{
		print("ERROR: " + e.Message);
	}
}

The error line is:
Uri url = new EyeTrackerCoreLibrary().GetConnectedEyeTracker();
in the Start function.

Anyone know what i am doing wrong ?

Regards

[Dieter Merkel]

Solved:

Do not know why, but it seems that Unity has some problems with the 64 bit version (or i forgot to set some settings ? anyway ).
If someone has the same problems:
– use the 32 bit dlls
– copy TobiiGazeCore32.dll into the project root folder
– copy Tobii.Gaze.Core.Net.dll into assets/plugins folder

That worked for me.

Edit: Oh and make sure there are no _just_in_case_ dlls of 64 version in your project.

[Anders]

Hi Dieter,
great to hear that you could sort it out and thanks for the advice.

[Ahmad]

I did all of those steps, still get the dll exception.

[Grant [Tobii]]

Hi Ahmad,

We generally recommend that if you are intending to work with the Unity engine that you use
the EyeX SDK.

Unless you have reason to use the GazeSDK, I would encourage you to try instead with the EyeX SDK
and let us know if your issues persist.

[Ahmad]

I want to find the distance from the player eyes to the screen. GazeSdk can give such info for me only.

[Alex [Tobii]]

Hi!

Check EyePositionDataStream from EyeX SDK for .NET (not the one for Unity)
It provides a stream of eye position data, that is, eye positions in 3D space.

[Author]

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