Request Images in C# SDK V4 (No Unity)

[microdee]

Hello!
In V3 (Orion) SDK we had the pure C# bindings as well and in there we had

Controller.RequestImages(int frameid, Image.ImageType type, byte[] data)

to request for new images. Now in SDK V4 sadly the official pure C# bindings are gone and I had to extract the bindings from Unity Modules (LeapMotion/Core/Plugins/LeapCSharp). I needed to remove like 10 unity specific lines for exception handling and boom it was working fine for hands in my .NET 4.7 app. But unfortunately I couldn't figure out the new way of how to get images, as I found no indication of actively requesting images in UnityModules but Controller.ImageReady event never seems to be invoked.

So how does that work in SDK V4?
thanks in advance!

[microdee]

anybody? am I missing something very trivial?

[microdee]

I don't think so it's this niche of a problem

[AlexColgan]

Given that you're looking to working with pure C#, it is somewhat of a niche case. The main method is to bind the Controller.ImageReady event and then process the Image by creating a function (e.g. private void LeapImageReady(object sender, ImageEventArgs e) and then receive the image as e.image).

The issue you're encountering seems to be that the thread for processing messages just doesn’t seem to be operating correctly? It's hard to say why this would be the case, as it could be entirely down to your implementation/conversion/C# environment.

[kymeng]

To get the ImageReady event to be triggered, you also need to set the policy flag
leapController.SetPolicy(Controller.PolicyFlag.POLICYIMAGES);

[mandawah]

Hello @microdee,

did those comment solve your issue? I was about to start working on a pure C# no unity dev with LeapMotion V4 and found your post.

Any chance you could share what you already have on a github or something? I'll be happy to take this as my starting point and contribute to this code.

Thanks in advance

[frenzon]

Here's my example of a straight V4 SDK C# project with no Unity - following @microdee findings, I just took my V3 project, added all the CS files from the Leap Unity Package
to a subfolder and commented out all the lines that broke (either they were Unity debugging code, or Mono-related stuff I didn't need). I removed the old DLL references, made sure I was referencing the V4 DLL, and the project built with no changes to my core code. You can see this in the commit where I made the V3-V4 update and added Ultraleap's CS files.

glenmurphy/fingers