Obtaining Invalid Frames

[maria_alcon]

Hi Everyone!

I'm studying Biomedical Engineering and I'm using Leap Motion to control 3D Slicer Software. I'm programming it in Python. I dont know why, but I'm obtaining Invalid Frames. I have this lines to obtained a frame:

class LeapMotionListener(Leap.Listener):

def init(self, controller):
super(LeapMotionListener, self).init()
self.controller = Leap.controller
def on_frame(self, controller):
self.frame = controller.frame()
print self.frame
The sentence 'print' shows Invalid Frame but it is weird because it shows the message in the software even when Leap Motion is not connected. Any idea?

Thank you so much in advanced,

[s1a1n1d1]

Have you solved this problem?
I have the same problem as you.

[AlexColgan]

What version of the core software are you using? I should note that Python is no longer supported.

[dlanday]

I have this same problem. I printed some output from my python script. I used .is_empty to check the device list, checked device connectivity, and checked service connectivity:

python Del01.py
pygame 1.9.6
Hello from the pygame community. https://www.pygame.org/contribute.html
<Leap.DeviceList; proxy of <Swig Object of type 'Leap::DeviceList *' at 0x000000000342BE10> >
no device in device list
(False, 'device is not connected')
(True, 'service is connected')

The thing that confuses me is that I can use the visualizer, diagnostic visualizer, and all the green lights in the troubleshoot window are on. Theoretically, I should be able to talk to the device. I am confused... any suggestions?

[AlexColgan]

You need to revert to version 3.2.1. Version 4 completely dropped legacy APIs including Python.