auto update port list in python-CodePudding

I want to create a user interface with tkinter and it includes reading serial ports. I use code like this

from tkinter.ttk import Combobox
import serial
import sys
import serial.tools.list_ports
from tkinter.messagebox import showinfo
from tkinter import *

window=Tk()
window.title("test cell")

ports=list(serial.tools.list_ports.comports())

selected=StringVar(window)
m_select=Combobox(window,textvariable=selected)
m_select['values']=ports
m_select['state']='readonly'
m_select.place(x=0,y=0)
window.mainloop()

in this case I can read all connected devices but if I connect or disconnect a new device I can not see it and I have to close the file and run it again. is there any way that I could refresh it automatically and do not need to close it??

CodePudding user response：

See the below example to update the list inside the combobox when the down arrow is clicked.

I've tested this with a dummy function that returns a random number of com ports but this should work the same with the serial.tools.comports function. (You'll need to comment back in lines that you require, I don't have serial on this PC)

from tkinter.ttk import Combobox
#import serial
import sys
#import serial.tools.list_ports
from tkinter.messagebox import showinfo
from tkinter import *

def comports():
    """Dummy function, remove me for the real thing"""
    import random
    ports = [f"COM{i}" for i in range(random.randint(1,10))]
    return ports

def updateComPortList():
    #ports=list(serial.tools.list_ports.comports())
    ports = comports()
    m_select['values']=ports

window=Tk()
window.title("test cell")

selected=StringVar(window)
m_select=Combobox(window,textvariable=selected,postcommand = updateComPortList)
m_select['state']='readonly'
m_select.place(x=0,y=0)

window.mainloop()