Question

我有一些与无线USB数字小键盘交互的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

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，内核可以将-kbd设备与-mouse设备区分开来，但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非可靠的测试。有没有办法使用evdev模块或替代方法检测给定的输入设备是键盘还是鼠标（或者两者中某些类似frankenstein的组合）？

Answer 1

在evdev中，似乎无法直接识别给定的输入设备是键盘还是鼠标。但您可以使用subprocess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]

然后您可以获得如下列表：

[
    "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"
]

使用evdev识别多功能输入设备的特定功能

1 个答案: