Running Python via VNC

[windy54]

Hi,

Hope this post is in the correct place!

I am running raspbian wheezey and following Neil Blacks blog I have managed to connect to the PI using VNC.

Also, following Matt Dyson's blog I have managed to control a maplins robotic arm from a joystick.

When the PI is connected to a TV I type in
sudo python RobotArm.py

and I can control the arm.

Now I have had to move away from the TV I am using VNC to connect to the PI.
I naively thought that the same command entered through VNC would work, silly me !

I get the following output
"client is not authorized to connect to ServerClient is not authorized to connect to ServerClient is not authorized to connect to Serverxcb_connection_has_error() returned true.
Client is not authorized to connect to Serverxcb_connection_has_error() returned true."

Can anyone please shed any light on what the problem is, I am guessing it is a privilege setting somewhere.

I have started to search the web but cant find anything that makes sense, to me that is !

thanks

Steve

[cae2100]

the vnc server is trying to run everything in like a protected mode. try running it as sudo when running the program or SSH'ing into the rpi and using it that way.

[windy54]

Thanks for the response.
I had tried SSH before and it did not seem to work, however , previously I closed the window. Today I did a CTRL-C, got an error message and then it worked.
The program actually opens another window which I do not see using SSH, not sure whether the CTRL-C did something to the other window, when I get a chance I will look at the program and see if it needs to open another window.

As for VCN, that still does not work.
I have used some code from Neil Black's blog for beginers and entered the following script:
"
Create a new file in the init.d directory:

sudo nano /etc/init.d/tightvncserver
Enter the following details:

#!/bin/sh
# /etc/init.d/tightvncserver
VNCUSER='pi'
case "$1" in
start)
su $VNCUSER -c '/usr/bin/tightvncserver :1'
echo "Starting TightVNC Server for $VNCUSER "
;;
stop)
pkill Xtightvnc
echo "TightVNC Server stopped"
;;
*)
echo "Usage: /etc/init.d/tightvncserver {start|stop}"
exit 1
;;
esac
exit 0
"

In an attempt to follow your suggestion I change the line su $VNCUSER -c '/usr/bin/tightvncserver :1'
to
sudo su $VNCUSER -c '/usr/bin/tightvncserver :1'

I need to dig a bit further and understand the su command and possibly try something like
su $VNCUSER -c 'sudo /usr/bin/tightvncserver :1'

so that tightvncserver runs as sudo and not the su command.

Thanks for the response, I will post another reply when I have had chance to try it.

Steve

[cae2100]

I didnt mean running the vnc server as root, but just using sudo to elevate python to root. like sudo python program.py whenever youre using the terminal in vnc.

[windy54]

I have to do that when running the python program directly from the PI so that it can access the USB port, so I was doing it when in VNC mode as well.

thanks for the response