Comments (10)
moses-palmer
commented on July 20, 2024
A degree sign is not a combining character.
When creating dead keys using pynput.keyboard.KeyCode, pynput assumes that you pass the non-combining character for a dead key, such as '~' for COMBINING TILDE U+0303. To work around this, do the following:
from pynput.keyboard import KeyCode
dead = KeyCode(char='°')
dead.is_dead = True
dead.combining = u'\u0325'
print(dead.join(KeyCode.from_char('L')))
from pynput.
SpecialCharacter
commented on July 20, 2024
Yes, this is exactly the problem.
I want to turn r° (degree sign) into r̥ (combining ring below), but the
moment I type °, pynput stops working and throws an error.
It works fine with " and ̋, so I think this is a bug.
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SpecialCharacter
commented on July 20, 2024
key 'r' released
r
Traceback (most recent call last):
File
"C:/Users/Bernd/AppData/Local/Programs/Python/Python36-32/string.latin_1.2-pynput38.py",
line 1955, in <module>
listener.join()
File
"C:\Users\Bernd\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pynput\_util\__init__.py",
line 185, in join
six.reraise(exc_type, exc_value, exc_traceback)
File
"C:\Users\Bernd\AppData\Local\Programs\Python\Python36-32\lib\site-packages\six.py",
line 685, in reraise
raise value.with_traceback(tb)
File
"C:\Users\Bernd\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pynput\_util\__init__.py",
line 140, in inner
return f(self, *args, **kwargs)
File
"C:\Users\Bernd\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pynput\keyboard\_win32.py",
line 232, in _process
key = self._event_to_key(msg, vk)
File
"C:\Users\Bernd\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pynput\keyboard\_win32.py",
line 265, in _event_to_key
msg in self._PRESS_MESSAGES))
File
"C:\Users\Bernd\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pynput\keyboard\_base.py",
line 49, in __init__
'COMBINING ' + unicodedata.name(self.char))
KeyError: "undefined character name 'COMBINING DEGREE SIGN'"
vs
key 'r' released
r
key Key.shift_r released
key '*' released
r*
key Key.shift_r released
key '#' released
r*#
key Key.backspace released
key Key.backspace released
key Key.backspace released
key 'r' released
r
key '̥' released
r̥
from pynput.
moses-palmer
commented on July 20, 2024
So the crash happens in pynput without the callback ever reaching you code?
Does the following snippet cause the crash?
from pynput import keyboard
with keyboard.Listener() as listener:
listener.join()
I don't have a degree sign on my keyboard, so I cannot test.
from pynput.
SpecialCharacter
commented on July 20, 2024
Exactly. It crashes in the moment I type ° (degree), i.e. BEFORE I have
the chance to type #.
(I tried it out with R°= instead of R°#; it crashes too.)
Then I replaced
with Listener(on_release=on_release) as listener:
listener.join()
with your snippet.
It says:
Traceback (most recent call last):[st?rt]
File
"C:/Users/Bernd/AppData/Local/Programs/Python/Python36-32/snippet39.py",
line 208, in <module>
with keyboard.Listener() as listener:
AttributeError: 'Controller' object has no attribute 'Listener'
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SpecialCharacter
commented on July 20, 2024
Actually, it crashes every time I type ° (degree), even if it is the first thing I do.
Does your degree key work?
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moses-palmer
commented on July 20, 2024
Unfortunately my keyboard does not have a degree sign, so I cannot really test it.
But if the crash happens inside pynput without even reaching your code, it is definitely a bug in the library.
It happens because Windows, when calling MapVirtualKeyEx, sets the most significant bit, indicating that the character is a diacritic, or a dead character.
pynput works under the assumption that MapVirtualKeyEx(MAPVK_VK_TO_CHAR, ...) will return a pre-composed combining character in these cases, so that pressing for example the dead key marked ~ will return TILDE. This does not appear to be the case. Is the degree sign an actual dead key on your keyboard? It seems reasonable to assume that it would then return RING ABOVE instead of DEGREE SIGN.
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SpecialCharacter
commented on July 20, 2024
Yes, it is Unicode Character 'DEGREE SIGN' (U+00B0).
But it doesn't matter, because as soon as I type °, /pynput/ crashes. No
matter what character I typed before, even if it is the first character
I type.
It is NOT a dead key! But I tried it with *# --> ˚ instead of °# --> ˚
and it works just fine.
Can you somehow change your keyboard temporarily, maybe to US-international?
Because so far, it gives me 'combining degree sign' (instead of ring
above/below) and crashes.
So I think something with |MapVirtualKeyEx(MAPVK_VK_TO_CHAR, ...) is not
right.|
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moses-palmer
commented on July 20, 2024
@SpecialCharacter, does this still happen with the master branch with a corrected keyboard listener?
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moses-palmer
commented on July 20, 2024
This is a duplicate of #199, which has more recent activity, so I will close this issue.
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