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我有一些与无线 USB 数字键盘交互的 Python 代码。我希望能够按名称发现设备,但显示为多个输入设备。在/dev/input/by-id

# ls -l /dev/input/by-id
total 0
lrwxrwxrwx 1 root root 9 Sep 25 14:30 usb-MOSART_Semi._2.4G_Keyboard_Mouse-event-kbd -> ../event0
lrwxrwxrwx 1 root root 9 Sep 25 14:30 usb-MOSART_Semi._2.4G_Keyboard_Mouse-if01-event-mouse -> ../event1
lrwxrwxrwx 1 root root 9 Sep 25 14:30 usb-MOSART_Semi._2.4G_Keyboard_Mouse-if01-mouse -> ../mouse0

并使用evdev模块:

>>> import evdev
>>> devices = [evdev.InputDevice(dev) for dev in evdev.list_devices()]
>>> for device in devices:
...   print(device.fn, device.name)
...
/dev/input/event1 MOSART Semi. 2.4G Keyboard Mouse
/dev/input/event0 MOSART Semi. 2.4G Keyboard Mouse

显然内核可以区分-kbd设备和-mouse设备,但是我如何在我的代码中做出决定呢?我现在提出的解决方案利用了“键盘”设备包含这些KEY_KP...功能的事实,所以我可以这样做:

def is_keyboard(device):
    return evdev.ecodes.KEY_KP1 in device.capabilities()[evdev.ecodes.EV_KEY]

...但这似乎更像是一种启发式而不是可靠的测试。有没有办法使用evdev模块或替代方法来检测给定的输入设备是键盘还是鼠标(或两者的某种类似科学怪人的组合)?

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1 回答 1

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似乎无法直接识别给定的输入设备是键盘还是鼠标evdev。但是您可以使用subprocess它作为替代方案。

import subprocess

process = subprocess.run("ls -l /dev/input/by-id", shell=True, stdout=subprocess.PIPE)
devices = process.stdout.decode().split("\n")[1:-1]

然后你可以得到一个类似的列表:

[
    "lrwxrwxrwx 1 root root 9 Sep 25 14:30 usb-MOSART_Semi._2.4G_Keyboard_Mouse-event-kbd -> ../event0",
    "lrwxrwxrwx 1 root root 9 Sep 25 14:30 usb-MOSART_Semi._2.4G_Keyboard_Mouse-if01-event-mouse -> ../event1",
    "lrwxrwxrwx 1 root root 9 Sep 25 14:30 usb-MOSART_Semi._2.4G_Keyboard_Mouse-if01-mouse -> ../mouse0"
]
于 2017-09-26T01:32:49.880 回答