pass a variable between tkinter and toplevel windows

[janeik]

hello.
I have 2 windows:
a)window = tkinter.Tk(), a mapview and an Entry to write a filepath

b)top=Toplevel() and a label to view an image

I need to pass a dynamic variable (full filepath.i.e.: "d:/bilde/Rød.png" from window a to a PhotoImage function in window b. At present time, without success.

Plan is to make an event (sv), view an image on label,in window b (exactly below an tkintermap in window a).

It works ok as long as I hardcode the filepath in window b.

My doubt is, does the event (sv) trigger the PhotoImage function after I manually write in filepath into an tkinter Entry in window a?

(I might write/read a file to pass variable between windows, but that would be a none alternative and slow process).

Below is some copies of code in each window.

var1 in window a, shows correct path (entered from keyboard)
No image is shown from window b. No errors detected.

SOME CODE IN WINDOW A:

import tkinter
from Scripts import dati
from Scripts import rutiner
from tkinter.ttk import *
import tkintermapview
import customtkinter
from tkinter import Canvas
from tkinter import *
from datetime import datetime
from pynput.mouse import Button, Controller
import tkinter as tk
from PIL import ImageTk, Image
import cv2



#---------------------GLOBAL VARIABLES-------------------------
mouse = Controller()
zoom=1
db = "D:/Python311/Scripts/markers.db"
today = datetime.today( ).strftime("%d-%m-%Y-%H-%M-%S")
verdi=0
stinavn1=""
stinavn2=""
stinavn3=""
stinavn4=""
textentered1=""
var1=""

root_tk = tkinter.Tk()
window = root_tk
window.geometry("1920x1200+0+0")
window.minsize(1920, 1200)
window.resizable(False, False)
window.overrideredirect(True)
window.attributes('-topmost',True)

.
.

def callback(sv):
    textentered1= str(sv.get())
    var1 =textentered1
    if "htt" in var1:stitype="web"
    elif ".png" in var1:stitype= "fil"
    elif ".mp4" in var1:stitype = "vid"
    elif ".docx" in var1:stiltype = "word"

print(var1)
sv = StringVar()
sv.trace("w", lambda name, index, mode, sv=sv: callback(sv))
sti1 = customtkinter.CTkEntry(window, textvariable=sv, width=360, font=("Ariel",14,"bold"), placeholder_text="Sti til bilde 1 som skal behandles.(d:/bilde/abc.png)", justify=("left"))
sti1.place(x=12,y=1010)

.
.
TOPLEVEL WINDOW:

top = Toplevel()
top.geometry("1000x1000")   
top.resizable(False, False) 
top.overrideredirect(True)

histimg=PhotoImage(file="d:/bilde/Rød.png")                        (a png image with red circle)
label=Label(top,image=histimg)
label.place(x=0,y=0)

window.mainloop()