ImageGrab gives OSError randomly #7133
Description
What did you do?
I am using the following code snippet to copy the image from clipboard whenever the application (built using FastAPI) receives a request to do so.
from PIL import ImageGrab
im = ImageGrab.grabclipboard()What did you expect to happen?
For it to get the image currently copied in the clipboard.
What actually happened?
It works fine most of the time, however it will randomly give the following error
Traceback (most recent call last):
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\uvicorn\protocols\http\httptools_impl.py", line 436, in run_asgi
result = await app( # type: ignore[func-returns-value]
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 78, in __call__
return await self.app(scope, receive, send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\fastapi\applications.py", line 271, in __call__
await super().__call__(scope, receive, send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\applications.py", line 118, in __call__
await self.middleware_stack(scope, receive, send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\middleware\errors.py", line 184, in __call__
raise exc
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\middleware\errors.py", line 162, in __call__
await self.app(scope, receive, _send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\middleware\cors.py", line 84, in __call__
await self.app(scope, receive, send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\middleware\exceptions.py", line 79, in __call__
raise exc
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\middleware\exceptions.py", line 68, in __call__
await self.app(scope, receive, sender)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 21, in __call__
raise e
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 18, in __call__
await self.app(scope, receive, send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\routing.py", line 706, in __call__
await route.handle(scope, receive, send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\routing.py", line 276, in handle
await self.app(scope, receive, send)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\starlette\routing.py", line 66, in app
response = await func(request)
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\fastapi\routing.py", line 237, in app
raw_response = await run_endpoint_function(
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\fastapi\routing.py", line 163, in run_endpoint_function
return await dependant.call(**values)
File "C:\Users\M.user\Documents\GitHub\technical_alert\main.py", line 126, in get
im = ImageGrab.grabclipboard()
File "C:\Users\M.user\Documents\GitHub\technical_alert\alert\lib\site-packages\PIL\ImageGrab.py", line 112, in grabclipboard
fmt, data = Image.core.grabclipboard_win32()
OSError: failed to open clipboardWhat are your OS, Python and Pillow versions?
- OS: Windows 10 Pro 21H2
- Python: 3.9.16
- Pillow: 9.5.0