This might be more than you bargained for, but it's what I came up with to solve the problem you are facing.? When I started this I was new to Python, new to object oriented programming and new to IB API, so I'm sure there are better/more efficient ways to do this.
The trick is the UI needs to be created before IB API or you won't be able to update any variables in the UI from the API...BUT... the tkinter mainloop must be executed last because no processing will occur after mainloop is run.? ?
I'm submitting this because I really struggled with your question, so hopefully this helps you and others.
This template has the following characteristics:
- The program main function creates an instance of tkinter
- The tkinter frames are then created?
- An instance of the IB API is created
- The tkinter mainloop is run
- Steps 2-4 execute with the tkinter constructor (__init__)
- In the IBAPI initialization, a field in the UI is updated to show that it worked.
- As an added bonus, there is some code to wait for an actual connection to TWS before continuing (rather than just wait 1 or 2 seconds).? This is what the?orderIdAvailable stuff is about.
Here it is:
#########################################################################################################
# Name: ib_tkinter_template.py
# Author: Steve Tuscher
# Date: 30 AUG 2022
# Description: Template program to connect to TWS from tkinter
#########################################################################################################
# imports
from tkinter import *
from tkinter import ttk
from ibapi.client import EClient
from ibapi.wrapper import EWrapper
import threading
import datetime
?
#########################################################################################################
# Tkinter User Interface class
#########################################################################################################
class TkUi():
? ? def __init__(self):
? ? ? ? self.root = Tk()
? ? ? ? self.root.geometry('500x100')
? ? ? ? self.root.title("Tkinter and IB API Template App")
?
? ? ? ? # Create the actual UI? ??
? ? ? ? self.create_frames()
?
? ? ? ? # Connect to TWS?
? ? ? ? self.connect_to_TWS()
?
? ? ? ? # This has to be last
? ? ? ? self.launch_UI()
?
? ? # Create the UI frames
? ? def create_frames(self):
? ? ? ? # Frame1 is for the buttons
? ? ? ? self.frame1 = ttk.LabelFrame(self.root, padding=("8 10 8 10"))
? ? ? ? self.frame1.grid(column=1, row=1, sticky=(N, W, E, S))
? ? ? ? outputRow = 1
? ? ? ? quit_button = ttk.Button(self.frame1, text="QUIT", command=self.quit)
? ? ? ? quit_button.grid(row=outputRow, column=1, sticky=(W, E))
?
? ? ? ? outputRow += 1
? ? ? ? self.testField = StringVar()
? ? ? ? ttk.Label(self.frame1, textvariable=self.testField).grid(row=outputRow, column=1, sticky=(W))
?
?
? ? # Launch the UI
? ? def launch_UI(self):
? ? ? ? self.root.mainloop()
?
? ? # Quit button?
? ? def quit(self):
? ? ? ? try:
? ? ? ? ? ? self.client.disconnect()
? ? ? ? except:
? ? ? ? ? ? self.log("Unable to disconnect.")
? ? ? ? quit()
?
? ? # Connect to TWS
? ? def connect_to_TWS(self):
? ? ? ? self.client = IbApi(self)
? ? ? ? self.client.connect("127.0.0.1",? 7497, 0)
? ? ? ? thread = threading.Thread(target = self.client.run)
? ? ? ? thread.start()
? ? ? ? # Wait until an orderID is returned from TWS
? ? ? ? if not orderIdAvailable.wait(timeout=10):
? ? ? ? ? ? print("Connection to TWS failed at ", datetime.datetime.now().strftime("%H:%M:%S"))
? ? ? ? ? ? quit()
?
#########################################################################################################
# TWS API Class
#########################################################################################################
class IbApi(EWrapper, EClient):
? ? def __init__(self, tkUi):
? ? ? ? super().__init__()
? ? ? ? EClient.__init__(self, self)
? ? ? ? EWrapper.__init__(self)
? ? ? ? self.tkUi = tkUi
? ? ? ? self.tkUi.testField.set("IB API started.")
?
? ? def nextValidId(self, orderId: int):
? ? ? ? super().nextValidId(orderId)
? ? ? ? orderIdAvailable.set()
? ? ? ? self.nextValidOrderId = orderId
? ? ? ? print("NextValidId:", orderId)
?
#########################################################################################################
# Begin Mainline
#########################################################################################################
def main():
? ? TkUi()
?
if __name__ == '__main__':
? ? orderIdAvailable = threading.Event()
? ? main()
?
PurpleIce
