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  #1  
Old 06-17-2014, 07:01 AM
befl0 befl0 is offline
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Join Date: Jun 2014
Posts: 13
Problem viztracker values

Hi,

I used a tracker with a vrpn. Sometimes when I do a tracker.getData() and I put it in 8 values, a mistake appears because there are " too many values to unpack" but sometimes it's working perfectly. I realy don't understand why and where I can fixed the problem. I think it's a problem of connection but I am not sure. If you can help me how to find the solution.

Thanks,
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  #2  
Old 06-19-2014, 06:52 AM
Jeff Jeff is offline
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Posts: 2,471
Can you post the code you're using to access the VRPN tracker and save the data to the 8 values? Also, can you post the Vizard output and error messages?
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  #3  
Old 07-14-2014, 09:08 AM
befl0 befl0 is offline
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Join Date: Jun 2014
Posts: 13
The code to access to the vrpn tracker is :

Code:
def bigAndSmall():
	while True:
		yield viztask.waitTime(0.0001)
		x, z, y, h, p, r, ang_der, ang_izq = tracker.getData()
And the error is : File "viztracker.py", line 56, in bigAndSmall
x, z, y, h, p, r, ang_der, ang_izq = tracker.getData()
ValueError: too many values to unpack
check_vrpn_cookie(): VRPN Note: minor version number doesn't match: (prefer 'vrpn: ver. 07.31', got 'vrpn: ver. 07.30 0'). This is not normally a problem.

Thanks,
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  #4  
Old 07-14-2014, 11:51 AM
Jeff Jeff is offline
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Join Date: Aug 2008
Posts: 2,471
That error means there are more than 8 values being returned. You could save the values to a list and then extract the first 8.

Code:
data = tracker.getData()
x = data[0]
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  #5  
Old 07-15-2014, 02:33 AM
befl0 befl0 is offline
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Join Date: Jun 2014
Posts: 13
Hello,

Thanks for this answer, of course this is the solution.

It's working perfectly

Bérengère
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