Developing for Leap Motion in C# Tutorial (video, slides and code)

Thanks for the excellent tutorials Iris, i have a question "when the MainWindow is not in focus, leap doesnt try to read the fingers, how can we change that to read always? " 

Do you mean that you want a program that runs in the background as a service? 

I think that Sandeep wants to say : if the mainwindow is open but an other windows of an other program has the focus.

Very nice job 

Thanks for thème vidéo ! I Will receivethe leap Motion and of this week and used your code

Regards 

Sweet, and congrats! Let me know how it goes and feel free to ask questions! Here is a list of questions BTW: 16 questions on Leap Motion answered http://www.irisclasson.com/2013/07/02/stupid-question-200-216-16-questions-on-leap-motion-answered/ 

I just want to tell you THANK YOU for the tutorial.  This is awesome.  You are AWESOME. 

love it! I want to tray that with Sensoria Gaming/Fitness http://08milluz.wordpress.com/2013/08/07/sensoria-gdk/ 

I downloaded the sample code provided by you for Leap Motion.I added the all api required to run application but it is showing error in below line:

var screen = _controller.CalibratedScreens.ClosestScreenHit(fingers[0]);
Error Details :
‘Leap controller could not contain a definition for ‘CalibratedScreens’ and no extension method ‘CalibratedScreens’ accepting a first argument of type ‘LeapController’ could be found (are your missing a using directive or an assembly reference?)

Can you help me out ?

Thanks. 

used 'locatedScreens' instead of 'CalibratedScreens' and it worked nicely. 

well,I am zero at c#.And unfortunately i have just got an assignment where I have to design a gesture based powerpoint presentation?

Can any body guide me..i am absolute begineer at it.. 

Hej,
I have a question about the Leap Motion Controller used as a mouse. I'm writing my bachelor thesis and I need exactly that :D. I watched your videos above and also downloaded the code. You 've said that the code in the "LeapAsMouse" Class is absolutely enough to enable this feature. Would this work the same way in C++?
I'm more a java programmer than a C++/C# programmer so maybe you can help me.

Många hälsningar 

i am creating new assembly file .dll which i will be using in maxscript. how should i add leap.dlll and leapCsharp.dll in my assembly .dll file.. (c# code) 

I haven't worked with maxscript before, but if its is an 'ordinary' .Net application then add the C# dll's and set copy to output always.

If you can give me some more information I might be able to better help you!

I (and a fellow dev) are publishing a course on developing for Leap Motion in C# next week, I'll email you once the course is out, there is a free trial where the course is published ( www.pluralsight.com ) :) It's a very good course that covers both a simple example, and a more complete example. 

Thank you, for the brief - but however extremely efficient- tutorial :) 

Hi, encountered with 2 errors and the programme can't be run.. 

Error	1	'Leap.HandList' does not contain a definition for 'Empty' and no extension method 'Empty' accepting a first argument of type 'Leap.HandList' could be found (are you missing a using directive or an assembly reference?)	C:\Users\L31006\Desktop\Leap-Motion-master\Leap_WPF\Util\CustomListener.cs	33	29	Leap_WPF

Error	2	'Leap.Controller' does not contain a definition for 'locatedScreens' and no extension method 'locatedScreens' accepting a first argument of type 'Leap.Controller' could be found (are you missing a using directive or an assembly reference?)	C:\Users\L31006\Desktop\Leap-Motion-master\Leap_WPF\ViewModel\MainViewModel.cs	58	38	Leap_WPF


Do help if you can.. Thanks! 

No code errors but this was prompted and stop the program from running.

'The invocation of the constructor on type 'Leap_WPF.MainWindow' that matches the specified binding constraints threw an exception.' Line number '3' and line position '9' 

Hi the tutorial was done on one of the first versions of the SDK and a lot has changed since then. I'll see if I can find some time and update this tutorial. 

The tutorial is on an old version of the SDK, the screen object is now deprecated and Empty is now called IsEmpty if I remember correctly. An  up to date tutorial I've made is here: http://pluralsight.com/training/courses/TableOfContents?courseName=developing-leap-motion-csharp
There is a free trial if you don't have a subscription. I'll make a new tutorial for the blog soon, and ping you once its done. Feel free to contact me if I can be of any help! 

Hey, thanks a lot for your tutorial.... but i have a problem... how i know which finger is doing a tap??? 

Thank you :) Try grabbing the Pointable, have a look at the documentation here: https://developer.leapmotion.com/documentation/Languages/CSharpandUnity/API/class_leap_1_1_screen_tap_gesture.html

Leap.ScreenTapGesture Class:
Properties
Vector 	Direction [get]
 	The direction of finger tip motion. 
 
Pointable 	Pointable [get]
 	The finger performing the screen tap gesture. 
 
Vector 	Position [get]
 	The position where the screen tap is registered. 
 
float 	Progress [get]
 	The progess value is always 1.0 for a screen tap gesture. 

yep... that class should works... thanks, i putt my hands to works...bye 

Best of luck, let me know if I can help any further 

Hi Iris, I downloaded and extracted the tutorial code and am getting two errors.
"Leap.Controller' does not contain a definition for 'CalibrateScreens and no extension method..." lines 58 and 86...
Do you have an idea of how to fix this error? As I am new to Leap Motion and want to really understand all help and advice are appreciated. Thank you! 

Also I did try the suggestion from above for the locatedScreens. But I still have the same error now indicating  no definition for locatedScreens. So any advice is greatly appreciated! Thanks! 

AS I wrote the SDK is old and the screen methods are deprecated so the code will not run as is. The tutorial was made while the SDK was in beta and I haven't had the time to record new ones. I will do that as soon as I can, hopefully over Christmas. The course here: http://pluralsight.com/training/courses/TableOfContents?courseName=developing-leap-motion-csharp is up to date (by me and John). There is a free trial for Pluralsight. Give that a go, and I'll ping you as soon as I get this tutorial updated. 

AS I wrote the SDK is old and the screen methods are deprecated so the code will not run as is. The tutorial was made while the SDK was in beta and I haven't had the time to record new ones. I will do that as soon as I can, hopefully over Christmas. The course here: http://pluralsight.com/training/courses/TableOfContents?courseName=developing-leap-motion-csharp is up to date (by me and John). There is a free trial for Pluralsight. Give that a go, and I'll ping you as soon as I get this tutorial updated. 

Hi Iris

I'm new on Leap Motion Development, I was try to use a sample from https://developer-archive.leapmotion.com/documentation/v2/csharp/devguide/Project_Setup.html#windows-forms,

but  when I try to run it, the creation of a controller (Controller controller = new Controller();) 

shows the error message:
"The type initializer for Leap.LeapPINVOKE  threw an exception"

Please, help me