# GUI server side: read and display non-GUI script's output

import sys, os
from socket import *                         # including socket.error 
from tkinter import Tk
from PP4E.launchmodes import PortableLauncher
from PP4E.Gui.Tools.guiStreams import GuiOutput

myport = 50008
sockobj = socket(AF_INET, SOCK_STREAM)       # GUI is server, script is client
sockobj.bind(('', myport))                   # config server before client
sockobj.listen(5)

print('starting')
PortableLauncher('nongui', 'socket-nongui.py -gui')()  # spawn non-GUI script 

print('accepting')
conn, addr = sockobj.accept()                # wait for client to connect
conn.setblocking(False)                      # use nonblocking socket (False=0)
print('accepted')

def checkdata():
    try:
        message = conn.recv(1024)            # don't block for input
        #output.write(message + '\n')        # could do sys.stdout=output too
        print(message, file=output)          # if ready, show text in GUI window
    except error:                            # raises socket.error if not ready
        print('no data')                     # print to sys.stdout
    root.after(1000, checkdata)              # check once per second

root = Tk()
output = GuiOutput(root)                     # socket text is displayed on this
checkdata()
root.mainloop()