Printing server output data in tkinter Text widget

Question

I have a Tkinter text widget and I want to capture and put a server output in it.

Project folder:

project
| main.py
| servers_folder
| | default_server.py

In my main. I'm importing default_server.py with server = importlib.import_module('default_server.py'). It has to be another file tho.

main.py code:

def connect(server_name):
    for widget in frame.winfo_children():
        widget.grid_forget()

    def run():
        server = importlib.import_module(server_name)
        server.Server().start()

    command = Text(frame)
    command.grid(row=0, column=0)

    thread = t.Thread(target=run)
    thread.start()


Label(frame, text='Server name:').grid(row=0, column=0)
server_name = Entry(frame)
server_name.grid(row=0, column=1, sticky='NSEW')
Button(frame, text='Run server', command=lambda: connect(server_name.get())).grid(row=1, column=0, columnspan=2)

Server start function:

def start(self):
    print('[STARTING] Server is starting...')
    self.server.listen()
    print(f'[LISTENING] Server is listening on {self.SERVER}')
    while True:
        conn, addr = self.server.accept()
        thread = t.Thread(target=self.handle_client, args=(conn, addr))
        thread.start()

Server handle_client function:

def handle_client(self, conn, addr):
    print(f'[NEW CONNECTION] {addr} connected.')
    print(f'[ACTIVE CONNECTIONS] {t.active_count() - 1}')

    connected = True
    while connected:
        msg_lenght = conn.recv(self.HEADER).decode(self.FORMAT)
        if msg_lenght:
            msg_lenght = int(msg_lenght)
            msg = conn.recv(msg_lenght).decode(self.FORMAT)
            if msg == self.DISCONNECT_MESSAGE:
                connected = False

            print(f'[MESSAGE RECIEVED] FROM: {addr}; Message: {msg}')
            conn.send('Message received!'.encode(self.FORMAT))

    conn.close()

How can I display server output in my tkinter text widget?

Thanks for help!

Can you show your handle_client function?

user11718531
– user11718531

2022-04-05 08:55:14 +00:00
Commented Apr 5, 2022 at 8:55 — user11718531
– user11718531, Commented Apr 5, 2022 at 8:55

score 1 · Accepted Answer · 2022-04-05 09:51:59Z

1

It would be easily for me to see the full code, but I think you can do something similar to this:

def start(self, msg_callback):
    print('[STARTING] Server is starting...')
    self.msg_callback = msg_callback
    self.server.listen()
    print(f'[LISTENING] Server is listening on {self.SERVER}')
    while True:
        conn, addr = self.server.accept()
        thread = t.Thread(target=self.handle_client, args=(conn, addr))
        thread.start()


def handle_client(self, conn, addr):
    print(f'[NEW CONNECTION] {addr} connected.')
    print(f'[ACTIVE CONNECTIONS] {t.active_count() - 1}')

    connected = True
    while connected:
        msg_lenght = conn.recv(self.HEADER).decode(self.FORMAT)
        if msg_lenght:
            msg_lenght = int(msg_lenght)
            msg = conn.recv(msg_lenght).decode(self.FORMAT)
            self.msg_callback(msg)
            if msg == self.DISCONNECT_MESSAGE:
                connected = False

            print(f'[MESSAGE RECIEVED] FROM: {addr}; Message: {msg}')
            conn.send('Message received!'.encode(self.FORMAT))

    conn.close()


def connect(server_name):
    for widget in frame.winfo_children():
        widget.grid_forget()

    command = Text(frame)
    command.grid(row=0, column=0)
    
    def msg_callback(msg):
        command.delete('1.0', END)
        command.insert('1.0', msg)

    def run():
        server = importlib.import_module(server_name)
        server.Server().start(msg_callback)

    thread = t.Thread(target=run)
    thread.start()


Label(frame, text='Server name:').grid(row=0, column=0)
server_name = Entry(frame)
server_name.grid(row=0, column=1, sticky='NSEW')
Button(frame, text='Run server', command=lambda: connect(server_name.get())).grid(row=1, column=0, columnspan=2)

edited Apr 5, 2022 at 9:51

answered Apr 5, 2022 at 9:15

user11718531

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6 Comments

xikodev Over a year ago

It is not working with both command["text"] = msg or command.insert("1.0", msg)

user11718531 Over a year ago

Ok, sorry, I will try to fix it.

user11718531 Over a year ago

@BokiX I have updated the answer. Can you try with command.delete('1.0', END) command.insert('1.0', msg)

xikodev Over a year ago

I used a simple print statement for testing and it isn't even printing anything, the function is not working. I put it like this: print(f"Message: {msg}")

user11718531 Over a year ago

@BokiX Can you then post the full code? It is hard to debug if I can't reproduce the error. Also, did you insert self.msg_callback(msg) into handle_client()?

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