[Solved] vb.net

[David Thomson]

As a newcomer to the forum, has anybody got any basic vb.net code that they are willing to share?

[Patrik [Tobii]]

I’m sorry that we currently do not have any examples targeting VB.NET.

If you want to get started as soon as possible with the EyeX SDK using VB.NET, I would recommend a service like Telerik’s Code Converter. Using a service like this, you can simply convert the C# code examples or source code on this forum to VB.NET.

In the meanwhile, here is my contribution 🙂

'-----------------------------------------------------------------------
' Copyright 2014 Tobii Technology AB. All rights reserved.
'-----------------------------------------------------------------------

Imports EyeXFramework
Imports Tobii.EyeX.Framework

Module Program

    Public Sub Main(args As String())

        ' Create the EyeX host
        Using eyeXHost = New EyeXHost()

            ' Create a data stream: lightly filtered gaze point data.
            ' Other choices of data streams include EyePositionDataStream and FixationDataStream.
            Using dataStream = eyeXHost.CreateGazePointDataStream(GazePointDataMode.LightlyFiltered)

                ' Start the EyeX host.
                eyeXHost.Start()

                ' Write the data to the console.
                AddHandler dataStream.Next, AddressOf OutputGazePoint

                ' Let it run until a key is pressed.
                Console.WriteLine("Listening for gaze data, press any key to exit...")
                Console.ReadKey(True)

            End Using

        End Using

    End Sub

    Private Sub OutputGazePoint(sender As Object, e As GazePointEventArgs)
        Console.WriteLine("Gaze point at ({0:0.0}, {1:0.0}) @{2:0}", e.X, e.Y, e.Timestamp)
    End Sub

End Module

[David Thomson]

Thanks for your help.

Nearly there but AddHandler dataStream.[Next] is creating an error?

[Patrik [Tobii]]

Hello David,

I’ve updated the example. Since the [ and ] characters surrounding the Next property just is a way of telling the compiler that “I know that this is a keyword, but I want to use it anyway” (just like the @-prefix for variables in C#), and since it’s not actually needed here, you should be able to delete those characters and it should compile.

It’s strange that you get a compilation error though.
What does the error say?

/ Patrik

[Meir Naiman]

How did yo include the EyeXFramework in your vb.net project?

[Patrik [Tobii]]

Hello Mehr,

There are two ways you can go to include the EyeXFramework in your VB.NET project.

1. Compile the framework yourself and add a reference to the compiled assembly.
2. Add the EyeXFramework C# project to your solution (it’s OK to mix them) and reference the project directly.

/ Patrik

[Meir Naiman]

Thank you for your reply, i will try both and see which works better for me.

[Aniket Sakinala]

Hi, I’ve tried to reference the ‘Tobii.EyeX.Client.dll’ provided in the TobiiEyeXSdk-DotNet-1.5.466 in one of my VB.NET project but I get an error that the reference could not be added. Please help.

[Jenny [Tobii]]

Hi Aniket,

It sounds like you are trying to add the Tobii.EyeX.Client.dll as a managed dll. You cannot do that, since it is a native dll. I know how to add it in a C# project and I’m guessing it should be similar in VB.NET (though I have never tried).

Check out this forum topic and the solution I proposed there:
http://developer.tobii.com/community/forums/topic/tobii-eyex-sdk-setup-c/

If that doesn’t work, I suggest you google “reference native dll vb.net”.

[Aniket Sakinala]

Thanks Jenny, that seemed to have fixed it.

The other problem I’m facing is that the Tobii EyeX Engine is not connecting to the eye tracker(The icon tray says it’s not connected). It works in the Tobii Studio but I can’t get it to work in any .NET projects. The projects compile but there’s no detection.

[David Thomson]

You previously provided a snippet of VB.net code for the EyeX API. Could you get me going with a similar snippet for the Gaze API. I cannot seem to find any documentation on this.

[Grant [Tobii]]

Hi @profthomson, unfortunately we do not have a visual Basic sample for the Gaze API as this is not a supported binding.

Hopefully the existing sample you have of EyeX can point you in the right direction.

[Doug Livingstone]

Dear Tobii

As a newbie and getting started with an EyeTracker 4C, it would be great if you could post additional articles/code about using the VB.Net and the EyeTracker

regards
Doug Livingstone

[Grant [Tobii]]

Hi @mndcommunicate, thanks for your suggestion however for the time being we are not targeting VB.Net development within the new Tobii Core SDK.

That being said, you can still follow the instructions above in this thread for converting our supplied eye tracking sample applications from C# into VB.net compatible code if necessary.

I would recommend you start by running the code above to get up and running and thereafter consider code conversion for the more advanced samples… did you already go through these procedures without success?

[Doug Livingstone]

Thanks Grant

I have been able to run the programs from the TobiiEyeXSdk-Dotnet-1.8.498. In particular I thought the GazeAwareForms program suited me as a start point. However using the Telerik utility I have not been able to successfully convert it to VB.Net. If anyone else has performed this conversion I would appreciate the advice. That applies to the other dotnet programs, as such examples would get me started.

Regards
Doug

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