Link between Tkinter and Socket

Question

for a project I need to create a Tkinter GUI which displays the data sent by Socket. I thought about the after() method but I don't know how to use it. Can someone helps me ? Thanks

Here's my whole code: https://pastecode.xyz/view/5b23d322

and here's only the function that check if there's something arriving:

def verifsock():
   global socket
   socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
   socket.bind(('172.16.2.220', 15555))

   socket.listen(5)
   client, address = socket.accept()
   print ("{} connected".format( address ))

   response = client.recv(255)
   if response != "":
       log.insert(END, response)
   else:
       return

EDIT:

def eleve2():


quitterMDPeleve()
global eleve2
eleve2 = tk.Tk()
eleve2.title("Espace élèves")
eleve2.config(bg='#A26F65')
eleve2.geometry('1650x1050')

global logRec

logRec = tk.Text(eleve2, width=25, height=20, takefocus=0, font = ('Tw Cen MT', 15))
logRec.place(x=400, y=310, anchor='w')

global threadEl

threadEl = threading.Thread(target=verifsock)
threadEl.daemon = True # without the daemon parameter, the function in parallel will continue even your main program ends
threadEl.start()

eleve2.mainloop()

and the function called:

def verifsock():
global socket
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket.bind(('172.16.2.220', 15555))

socket.listen(5)
client, address = socket.accept()
print ("{} connected".format( address ))

response = client.recv(255)
if response != "":
    logRec.insert(END, response)
else:
    return

You may need to use a separate `Thread` for this because `socket.accept()` will block until a client connects. You can push the data from the `client.recv()` into a queue and use `after` to repeatedly check this queue. — quamrana, Mar 04 '20 at 16:08
Does this answer your question? [Running a thread with Tkinter object](https://stackoverflow.com/questions/56117419/running-a-thread-with-tkinter-object) — quamrana, Mar 04 '20 at 16:13

Phoenixo · Answer 1 · 2020-03-04T17:26:42.833

0

Few tips :

You will need to do multiple "infinite loops" (like while True) using threads :

one loop to accept new connections
one loop waiting for messages (the receiver)
one loop for the graphic interface (your tkinter.Tk().mainloop())

You do not need the after() event. For example you can, when receiving a socket message, update a variable in GUI.

EDIT

Here is a little example using threads. The main program just create a thread, waits 3 seconds, and prints "end main program". The parallel thread executes the function counter() that prints an incrementing variable each second.

import threading
import time

def counter():
    c = 0
    while True:
        print(c)
        c += 1
        time.sleep(1)

thread_1 = threading.Thread(target=counter)
thread_1.daemon = True # without the daemon parameter, the function in parallel will continue even your main program ends
thread_1.start()

# MAIN PROGRAM
time.sleep(3)
print("end main program")

edited Mar 04 '20 at 17:26

answered Mar 04 '20 at 16:08

Phoenixo

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btw all programs have one thread already and its usual for `tkinter` to run in that thread. You can start another thread which blocks on `accept()` and spawns a new `Thread` for each connection. – quamrana Mar 04 '20 at 16:10
Also updating the GUI from another thread usually doesn't work. – quamrana Mar 04 '20 at 16:11
I completely agree, I never said he had to create a thread for `tkinter`. I said he would need multiple `loops`, which can be achieved using `threads` – Phoenixo Mar 04 '20 at 17:11
@Armczbt : see my EDIT answer with a little example using `threads` – Phoenixo Mar 04 '20 at 17:27
Thanks, this really helped me. However I have a new problem.. Once I send a first thing by socket, I can't send anything after... (SEE MY EDIT) – Armczbt Mar 05 '20 at 08:12

score 0 · Accepted Answer · answered Mar 05 '20 at 09:12

I finally managed to solve this problem, thanks to everyone who helped me ;)

Here's my code for those who are interested :

def eleve2():


quitterMDPeleve()
global eleve2
eleve2 = tk.Tk()
eleve2.title("Espace élèves")
eleve2.config(bg='#A26F65')
eleve2.geometry('1650x1050')

global logRec

logRec = tk.Text(eleve2, width=25, height=20, takefocus=0, font = ('Tw Cen MT', 15))
logRec.place(x=400, y=310, anchor='w')

global threadEl

threadEl = threading.Thread(target=verifsock)
threadEl.daemon = True # without the daemon parameter, the function in parallel will continue even your main program ends
threadEl.start()

eleve2.mainloop()



def verifsock():
global socket
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket.bind(('172.16.2.220', 15555))
while True:

    socket.listen(5)
    client, address = socket.accept()
    print ("{} connected".format( address ))

    response = client.recv(255)
    response2 = response.decode("utf-8")
    if response2 != "":
        logRec.insert(END, str(response2)+"\n")
    else:
        return

Link between Tkinter and Socket

2 Answers2