如何用Python在屏幕上层动态叠加、编辑及移除文本

Tkinter Implementation (Cross-Platform) #

Your existing Tkinter code likely failed because you used a blocking while True loop that froze the UI, or created new widgets instead of updating existing ones. Here's a working fix:

1. Setup Transparent, Always-on-Top Window #

import tkinter as tk

root = tk.Tk()
root.attributes('-topmost', True)  # Stay above all windows
root.attributes('-transparentcolor', root['bg'])  # Make background see-through
root.overrideredirect(True)  # Remove title bar/borders
root.geometry("250x60+150+150")  # Size and position

# Create a single label for dynamic text updates
sum_display = tk.Label(root, text="", font=("Segoe UI", 24), fg="#ff0000")
sum_display.pack(expand=True)

2. Integrate Non-Blocking Update Logic #

Use Tkinter's after() method to run your screen-reading logic without freezing the UI:

def update_total():
    # Replace this with your actual screen number detection code
    detected_numbers = [15, 25, 40]  # Example values
    total = sum(detected_numbers) if detected_numbers else 0

    # Update or clear the text
    if total > 0:
        sum_display.config(text=f"Total: {total}")
    else:
        sum_display.config(text="")

    # Schedule next update (100ms = 0.1s, adjust for your needs)
    root.after(100, update_total)

# Start the update loop
update_total()
root.mainloop()

3. Handle Full-Screen Windows (Windows) #

If the overlay gets hidden behind full-screen apps on Windows, add these attributes:

root.attributes('-toolwindow', True)
root.attributes('-disabled', True)

Win32 API Implementation (Windows Only) #

For Windows-specific control, use the Win32 API to create a layered overlay window:

import win32gui
import win32api
import win32con
import time

class Overlay:
    def __init__(self):
        self.hwnd = self.create_window()

    def create_window(self):
        wc = win32gui.WNDCLASS()
        wc.lpfnWndProc = self.wnd_proc
        wc.lpszClassName = "ScreenSumOverlay"
        wc.hInstance = win32api.GetModuleHandle(None)
        win32gui.RegisterClass(wc)

        return win32gui.CreateWindowEx(
            win32con.WS_EX_LAYERED | win32con.WS_EX_TRANSPARENT | win32con.WS_EX_TOPMOST,
            "ScreenSumOverlay", "", win32con.WS_POPUP,
            150, 150, 250, 60, 0, 0, wc.hInstance, None
        )

    def wnd_proc(self, hwnd, msg, wparam, lparam):
        if msg == win32con.WM_PAINT:
            hdc = win32gui.GetDC(hwnd)
            # Replace with your calculated total
            current_total = 80
            if current_total > 0:
                win32gui.TextOut(hdc, 20, 15, f"Total: {current_total}", len(f"Total: {current_total}"))
            win32gui.ReleaseDC(hwnd, hdc)
            return 0
        return win32gui.DefWindowProc(hwnd, msg, wparam, lparam)

    def refresh(self):
        win32gui.InvalidateRect(self.hwnd, None, True)
        win32gui.UpdateWindow(self.hwnd)

# Run the overlay
overlay = Overlay()
while True:
    # Insert your screen number reading logic here
    overlay.refresh()
    time.sleep(0.1)

内容的提问来源于stack exchange，提问作者Tobias Christensen