R R
Reputation: 31
How to avoid screenshot error using mss when using a class for tk window?
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()
Upvotes: 0
Views: 32
Answers (0)
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