Problems with sockets and threads

[Dexter Deejay]

When i try to run this code and to connect to server (server is written in java that part of code is ok) everything stalls. Thread that i created here occupies processor all the time and GUI freezes. It's supposed to be waiting for message from server. (asynchronous one) Is there something that i did wrong here, or is there better way to do this?


from tkinter import *
from threading import *
import time
import socket
import sys

comPort=0
msg=""
name=socket.gethostbyname(socket.gethostname())
sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
testArea=0
thread=0

def threadFunc():
    global sock
    global textArea
    data=""
    while(data==""):
        try:
            data=str((sock.recvfrom(256)),"UTF-8")
        except BlockingIOError:
            print("failed")
            time.sleep(1)
            data=""
    textArea.add((data+"\n"))

def sendMsg():
    global sock
    message=name+": "+msg.get()+"\n"
    sock.send(bytes(message,"UTF-8"))

def aboutCommand():
    messagebox.showinfo(title="About",message="This is first (serious) aplication in python.")

def helpCommand():
    messagebox.showinfo(title="Help",message="BAZINGA!")

def Connect():
    global sock
    global thread
    sock.connect((serverIPString.get(), 16000))
    sock.send(bytes("#connect request#\n",'UTF-8'))
    data=sock.recvfrom(256)
    reply=str(data[0],"UTF-8")
    answer=(reply.split("#",3))
    if(answer[1]!="connected"):
        messagebox.showinfo(title="Error",message="Connection failed!")
        return
    sock.close();
    sock=None
    comPort=int(answer[2])       #for new connection
    sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect((serverIPString.get(), comPort))
    sock.setblocking(0)
    thread=Thread(target=threadFunc())
    thread.start()

def Disconnect():
    global sock
    sock.send(bytes("#END#\n","UTF-8"))
    sock.close()

def ExitApplication():
    Disconnect()
    mGui.destroy()
    return

mGui=Tk()
msg=StringVar()
serverIPString=StringVar()
mGui.geometry("400x600+200+20")
mGui.title("Chat client v1.0")

labServer=Label(mGui,text="Server IP adress: ").pack()
entServer=Entry(mGui,textvariable=serverIPString).pack()
btnConnect=Button(mGui,text="Connect",fg="red",bg="blue",command=Connect).pack()
btnDisconnect=Button(mGui,text="Disconnect",fg="red",bg="blue",command=Disconnect).pack()
textArea=Text(mGui,bg="yellow").pack()
entMessage=Entry(mGui,textvariable=msg).pack()
btnSendMsg=Button(mGui,text="Send message",fg="white",bg="black",command=sendMsg).pack()

menuBar=Menu(mGui)

fileMenu=Menu(menuBar,tearoff=0)
fileMenu.add_command(label="Exit",command=ExitApplication)
menuBar.add_cascade(label="File",menu=fileMenu)

optionsMenu=Menu(menuBar,tearoff=0)
optionsMenu.add_command(label="Change chat name")
optionsMenu.add_command(label="Connect",command=Connect)
optionsMenu.add_command(label="Disconnect",command=Disconnect)
menuBar.add_cascade(label="Options",menu=optionsMenu)

helpMenu=Menu(menuBar,tearoff=0)
helpMenu.add_command(label="Help",command=helpCommand)
helpMenu.add_command(label="About",command=aboutCommand)
menuBar.add_cascade(label="Info",menu=helpMenu)
mGui.config(menu=menuBar)
mGui.mainloop()