The idea is to monitor the secondary screen without needing a physical monitor. The image goes to a projector in another room. This error occurs when the secondary screen is clicked (to exit full screen mode): root2: You clicked at 295 284 Exception in Tkinter callback Traceback (most recent call last): File "/usr/lib/python3.12/tkinter/__init__.py", line 1967, in __call__ return self.func(*args) ^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/tkinter/__init__.py", line 861, in callit func(*args) File "/media/rh/Win11/Python/cv2-player/cv2_mss2.py", line 65, in after_capture im_brg = self.sct.grab(self.bounding_box) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/rh/.local/lib/python3.12/site-packages/mss/base.py", line 101, in grab screenshot = self._grab_impl(monitor) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/rh/.local/lib/python3.12/site-packages/mss/linux.py", line 428, in _grab_impl ximage = self.xlib.XGetImage( ^^^^^^^^^^^^^^^^^^^^ File "/home/rh/.local/lib/python3.12/site-packages/mss/linux.py", line 230, in _validate raise ScreenShotError(msg, details=details) mss.exception.ScreenShotError: XGetImage() failed The code that works without error, and without being in a class: from mss import mss from PIL import Image from PIL import ImageTk import tkinter as tk root2 = None root2_is_splash = False # screen 2: 1366x768 def root2_init(is_splash=False): global root2 root2 = tk.Toplevel( root ) root2.transient( root ) root2.title( "Screen 2" ) root2.configure(background="blue") root2.geometry("1366x768+1920+0") # left: 1920 (right of screen 1), top: 0 root2.bind("<Button-1>", on_root2_click) if is_splash == True: root2.wm_attributes('-type', 'splash') # splash: hide title bar def on_root_click(event): print("root: You clicked at", event.x, event.y) root.destroy() def on_root2_click(event): global root2_is_splash print("root2: You clicked at", event.x, event.y) root2.destroy() if root2_is_splash == False: root2_init(True) root2_is_splash = True else: root2_init(False) root2_is_splash = False def after_capture(): global label1 im_brg = sct.grab(bounding_box) im_rgb = Image.frombytes('RGB', im_brg.size, im_brg.bgra, 'raw', 'BGRX') im_rgb2 = im_rgb.resize((640, 480)) photo1 = ImageTk.PhotoImage(im_rgb2) label1.configure(image=photo1) label1.image = photo1 root.after(10, after_capture) bounding_box = {'top': 0, 'left': 1366, 'width': 1366, 'height': 768} sct = mss(with_cursor=True) # screen 1: 1920x1080 root = tk.Tk() root.title("Tk Example") root.minsize(200, 200) root.maxsize(500, 500) root.geometry("800x600+50+50") root.bind("<Button-1>", on_root_click) canvas1 = tk.Canvas(root) canvas1.pack(fill='both', expand=True) photo1 = tk.PhotoImage(width=64, height=64) label1 = tk.Label(canvas1, image=photo1) label1.pack() label1.image = photo1 canvas1.create_window((0, 0), anchor='nw', window=label1, tags='label1_tag') root2_init() after_capture() if __name__ == "__main__": root.mainloop() The code that gives the error, using a class App(): from mss import mss from PIL import Image from PIL import ImageTk import tkinter as tk class App(tk.Tk): def __init__(self): super().__init__() self.bounding_box = {'top': 0, 'left': 1366, 'width': 1366, 'height': 768} self.sct = mss(with_cursor=True) # screen 1: 1920x1080 self.title("Tk Example") self.geometry("800x600+50+50") self.canvas1 = tk.Canvas(self) self.canvas1.pack(fill='both', expand=True) photo1 = tk.PhotoImage(width=64, height=64) self.label1 = tk.Label(self.canvas1, image=photo1) self.label1.pack() self.label1.image = photo1 self.canvas1.create_window((0, 0), anchor='nw', window=self.label1, tags='label1_tag') self.bind("<Button-1>", self.on_root_click) self.root2_is_splash = False self.root2_init() self.after_capture() # screen 2: 1366x768 def root2_init(self, is_splash=False): # global root2 self.root2 = tk.Toplevel( self ) self.root2.transient( self ) self.root2.title( "Screen 2" ) self.root2.configure(background="blue") self.root2.geometry("1366x768+1920+0") # left: 1920 (right of screen 1), top: 0 self.root2.bind("<Button-1>", self.on_root2_click) if is_splash == True: self.root2.wm_attributes('-type', 'splash') # splash: hide title bar def on_root_click(self, event): print("root: You clicked at", event.x, event.y) self.destroy() def on_root2_click(self, event): print("root2: You clicked at", event.x, event.y) self.root2.destroy() if self.root2_is_splash == False: self.root2_init(True) self.root2_is_splash = True else: self.root2_init(False) self.root2_is_splash = False def after_capture(self): im_brg = self.sct.grab(self.bounding_box) im_rgb = Image.frombytes('RGB', im_brg.size, im_brg.bgra, 'raw', 'BGRX') im_rgb2 = im_rgb.resize((640, 480)) photo1 = ImageTk.PhotoImage(im_rgb2) self.label1.configure(image=photo1) self.label1.image = photo1 self.after(10, self.after_capture) if __name__ == "__main__": App().mainloop() Edit: I managed to make an adaptation to restart the capture, but it would be interesting to avoid the mss capture error. This way the capture doesn't get stuck. I put an error handler using try: from mss import mss from PIL import Image from PIL import ImageTk import tkinter as tk class App(tk.Tk): def __init__(self): super().__init__() self.bounding_box = {'top': 0, 'left': 1366, 'width': 1366, 'height': 768} # screen 1: 1920x1080 self.title("Tk Example") self.geometry("800x600+50+50") self.canvas1 = tk.Canvas(self) self.canvas1.pack(fill='both', expand=True) photo1 = tk.PhotoImage(width=64, height=64) self.label1 = tk.Label(self.canvas1, image=photo1) self.label1.pack() self.label1.image = photo1 self.canvas1.create_window((0, 0), anchor='nw', window=self.label1, tags='label1_tag') self.bind("<Button-1>", self.on_root_click) self.root2_is_splash = False self.root2_init() self.after_capture() # screen 2: 1366x768 def root2_init(self, is_splash=False): # global root2 self.sct = mss(with_cursor=True) self.root2 = tk.Toplevel( self ) self.root2.transient( self ) self.root2.title( "Screen 2" ) self.root2.configure(background="blue") self.root2.geometry("1366x768+1920+0") # left: 1920 (right of screen 1), top: 0 self.root2.bind("<Button-1>", self.on_root2_click) if is_splash == True: self.root2.wm_attributes('-type', 'splash') # splash: hide title bar def on_root_click(self, event): print("root: You clicked at", event.x, event.y) self.destroy() def on_root2_click(self, event): print("root2: You clicked at", event.x, event.y) self.root2.destroy() if self.root2_is_splash == False: self.root2_init(True) self.root2_is_splash = True else: self.root2_init(False) self.root2_is_splash = False self.after_capture() def after_capture(self): try: im_brg = self.sct.grab(self.bounding_box) im_rgb = Image.frombytes('RGB', im_brg.size, im_brg.bgra, 'raw', 'BGRX') im_rgb2 = im_rgb.resize((640, 480)) photo1 = ImageTk.PhotoImage(im_rgb2) self.label1.configure(image=photo1) self.label1.image = photo1 self.after(10, self.after_capture) except: print('after_capture() finished') if __name__ == "__main__": App().mainloop() Continue reading...
