Python Forum

I have a python program and executed (python3 myprogram1.py) from the terminal in the RPI4B works perfectly.
I wanted to run on RPI4B without the keyboard and mouse and not want use an VNC.

But when I use a terminal from windows 10 on my pc with SSH remote and tried to run my program, it said:

Output:
pi@raspberrypi:~/python $ python3 myprogram1.py
Traceback (most recent call last):
  File "myprogram1.py", line 12, in <module>
    from pynput.mouse import Controller
  File "/home/pi/.local/lib/python3.7/site-packages/pynput/__init__.py", line 40, in <module>
    from . import keyboard
  File "/home/pi/.local/lib/python3.7/site-packages/pynput/keyboard/__init__.py", line 31, in <module>
    backend = backend(__name__)
  File "/home/pi/.local/lib/python3.7/site-packages/pynput/_util/__init__.py", line 82, in backend
    if resolutions else '')
ImportError: this platform is not supported: ('failed to acquire X connection: Bad display name ""', DisplayNameError(''))

Try one of the following resolutions:

 * Please make sure that you have an X server running, and that the DISPLAY environment variable is set correctly

I think I must something missing with the command line?

GUI programs that use Xwindows aren't directly executable on other machines through SSH.

If your local machine can run an X sserver, you can forward it through an SSH session. But that would be unusual for someone to run an X server on windows. It is possible though.

Why do you not want to run VNC? It's easier to run VNC client on windows than it is to run a full Xserver and then have the pi connect to it.

Or, could you have your program run in a command-line mode? Without a GUI, it's much easier to run non-web programs remotely.

I mean I just want to launch the program to the RPI4B itself.

For example:
- I open the PuTTY with SSH and connected with the RPI4B.
- I type python3 myprogram1.py
- the RPI4B to launch the myprogram1.py to run on RPI4B's LCD itself.

that's all.

I found from other forum.

use DISPLAY=:0.0 python3 myprogram1.py

it's worked!


Thank you for your helps.