Tkinter: Unable to send data via subprocess.PIPE

debugcn Published at Dev

fady malak

I want to do send & receive data program. No data sent to receive.py and when I close tkinter GUI, I get an empty list.

sender.py

import Tkinter as tk
import sys

def send(x):
    sys.stdout.write(x)
    return sys.stdout.flush()

class SampleApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.entry = tk.Entry(self)
        self.button = tk.Button(self, text="Get", command=self.on_button)
        self.button.pack()
        self.entry.pack()

    def on_button(self):
        x = ''.join(str(self.entry.get()))
        return send(x)

app = SampleApp()
app.mainloop()

receive.py

import subprocess
import time

xx = subprocess.Popen(["python","sender.py"], stdout=subprocess.PIPE,
                      stdin=subprocess.PIPE, shell=True)

while True:
    time.sleep(0.5)
    if xx.stdout.readlines():
        print xx.stdout.readlines()
    else:
        print "wait data"

martineau

I think the problem is the way you're trying to get data back from sender.py in receive.py. Your code with the changes shown below seems to work for me. Note I cleaned-up your Tkinter GUI code to only do what was necessary.

sender.py

import Tkinter as tk
import sys

def send(x):
    sys.stdout.write(x)
    sys.stdout.flush()

class SampleApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.entry = tk.Entry(self)
        self.button = tk.Button(self, text="Get", command=self.on_button)
        self.button.pack()
        self.entry.pack()
        self.entry.focus_set()  # added (optional)

    def on_button(self):
        x = ''.join(str(self.entry.get()))
        send(x)

app = SampleApp()
app.mainloop()

receive.py

import subprocess

with subprocess.Popen(["python","sender.py"], stdout=subprocess.PIPE,
                      stderr=subprocess.STDOUT, stdin=subprocess.PIPE,
                      shell=True).stdout as output:
    for line in output:
        print(line)

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