Non-synthetic Key.alt and Key.cmd about pynput HOT 7 CLOSED

I have pushed a fix to the master branch.

Instead of always using XSendEvent, which is necessary to handle multiple layouts, pynput no uses XFAKE for control keys.

Please notify if this fixes your issue---it worked for my local tests.

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Thanks for the quick fix, Moses. Now Key.ctrl, Key.shift, Key.alt and Key.cmd send non-synthetic keys. I can use Key.cmd for example to trigger the application menu.

However, Key.tab still sends a synthetic key, which still doesn't trigger application switching:

KeyRelease event, serial 38, synthetic YES, window 0x4e00001,
root 0x498, subw 0x0, time 0, (0,0), root:(0,0),
state 0x0, keycode 23 (keysym 0xff09, Tab), same_screen NO,
XLookupString gives 1 bytes: (09) " "
XFilterEvent returns: False

Side question: What happens if all keys, including normal letter keys, are sent as non-synthetic?

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I quickly checked the documentation for (XSendEvent)[https://tronche.com/gui/x/xlib/event-handling/XSendEvent.html] and XKeyEvent, and it does not seem to support manipulating the synthetic flag. PyUserInput uses XFAKE, which is a server extension, for sending fake events; I presume this is why it can set the flag.

Normal letters cannot be sent through XFAKE if a general solution compatible with the pynput API guarantees is sought; XFAKE does not support sending keys not mapped in the layout, and maintains its own modifier mapping.

I have pushed a new set of commits; now all keys with a known virtual key code are sent through XFAKE, thus allowing control keys and modifiers to be non-synthetic. I extended my local tests with alt+tab, and that too works now.

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Hey, you're very quick! It works beautifully now. =) Thanks very much!

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Hmm, something has changed though. Example:

Python 2.7.12 (default, Jul 1 2016, 15:12:24)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.

from pynput.keyboard import Key, Controller

keyboard = Controller()
keyboard.press('a')
Traceback (most recent call last):
File "", line 1, in
File "build/bdist.linux-x86_64/egg/pynput/keyboard/_base.py", line 371, in press
File "build/bdist.linux-x86_64/egg/pynput/keyboard/_xorg.py", line 204, in _handle
File "/usr/lib/python2.7/contextlib.py", line 24, in exit
self.gen.next()
File "build/bdist.linux-x86_64/egg/pynput/_util/xorg.py", line 76, in display_manager
pynput._util.xorg.X11Error: [(BadValue(), None)]

I installed pynput just now from 024dfd7

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I had a feeling this would be one of those ;-)

I made the mistake of not running the test suite after the modifications; it was so small, right?

I have pushed yet another set of commits that changes the default value of pynput.KeyCode.vk to None, which is a saner value, and what the previous patch expected.

Thank you for your input and testing!

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Thanks again, Moses. Your new commits fixed the issues. From what I could tell, everything works perfectly now. Maybe you'll want to close this issue to keep your issue tracker clean again.

Thanks for the great work!

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