ImageGrab.grab 不是获取 tkinter 窗口的小部件，而是获取其下的屏幕区域

Question

Try to capture the image of a widget in tkinter window by following code, but just get the screen area under tkinter window.

import ctypes
import platform
from time import sleep
import tkinter as tk

from PIL import ImageGrab

if platform.system() == "Windows" and platform.release() == "10":
    ctypes.windll.shcore.SetProcessDpiAwareness(1)

root = tk.Tk()
root.geometry("+0+0")

var = tk.StringVar()
var.set("Hello World")
entry = tk.Entry(root, width=40, bg='green', takefocus=False, textvariable=var)
entry.pack()

root.update()
# sleep(1)

x, y = entry.winfo_rootx(), entry.winfo_rooty()
width, height = entry.winfo_width(), entry.winfo_height()

im = ImageGrab.grab(bbox=(x, y, x+width, y+height))    # Grab image on screen
im.show()

root.mainloop()

It will be OK if line # sleep(1) replaced by sleep(1) . Had been tried method update or update_idletasks , all got same results.

Is there any method to finalize tkinter window immediately ? So I don't need to sleep one second each time to grap image of a widget. Or I get wrong way to go it, any suggestion is welcome.

Answer 1

It is obvious right? It needs to take some time to show the window but the screenshot is captured quite quickly. What do I suggest? Put it inside a function and take advantage of the after method here.

def screenshot():
    im = ImageGrab.grab(bbox=(x, y, x+width, y+height))    # Grab image on screen
    im.show()

root.after(1000,screenshot) # Depending on the time required to take show the window