使用Python获取键盘的输入
- 本文描述在 Ubuntu 20 上使用 python 获取键盘输入
1. 准备
- 安装 evdev
- 确认目标键盘的输入具体的设备号
- 使用
lsusb 查看键盘usb设备总线号和设备号
- 使用
cat /proc/bus/input/devices 和上面对应 ID
- 使用
cat /dev/input/event4 | hexdump 去测试可疑的输入设备
2. 使用如下 python 程序即可
- 本程序会将读到的键盘输入封装成 8Bytes 的 HID 键盘数据包，并添加到队列
import evdev
from evdev import InputDevice
from select import select
import re
ctrlkeymap = {
"KEY_LEFTSHIFT" : 0x2,
"KEY_RIGHTSHIFT" : 0x20,
"KEY_LEFTCTRL" : 0x01,
"KEY_RIGHTCTRL" : 0x10,
"KEY_LEFTALT" : 0x4,
"KEY_RIGHTALT" : 0x40,
"KEY_LEFTMETA" : 0x8,
"KEY_RIGHTMETA" : 0x80,
}
normalkeymap = {
"KEY_A" : 0x04,
"KEY_B" : 0x05,
"KEY_C" : 0x06,
"KEY_D" : 0x07,
"KEY_E" : 0x08,
"KEY_F" : 0x09,
"KEY_G" : 0x0A,
"KEY_H" : 0x0B,
"KEY_I" : 0x0C,
"KEY_J" : 0x0D,
"KEY_K" : 0x0E,
"KEY_L" : 0x0F,
"KEY_M" : 0x10,
"KEY_N" : 0x11,
"KEY_O" : 0x12,
"KEY_P" : 0x13,
"KEY_Q" : 0x14,
"KEY_R" : 0x15,
"KEY_S" : 0x16,
"KEY_T" : 0x17,
"KEY_U" : 0x18,
"KEY_V" : 0x19,
"KEY_W" : 0x1A,
"KEY_X" : 0x1B,
"KEY_Y" : 0x1C,
"KEY_Z" : 0x1D,
"KEY_0" : 0x27,
"KEY_1" : 0x1E,
"KEY_2" : 0x1F,
"KEY_3" : 0x20,
"KEY_4" : 0x21,
"KEY_5" : 0x22,
"KEY_6" : 0x23,
"KEY_7" : 0x24,
"KEY_8" : 0x25,
"KEY_9" : 0x26,
"KEY_KP0" : 0x62,
"KEY_KP1" : 0x59,
"KEY_KP2" : 0x5A,
"KEY_KP3" : 0x5B,
"KEY_KP4" : 0x5C,
"KEY_KP5" : 0x5D,
"KEY_KP6" : 0x5E,
"KEY_KP7" : 0x5F,
"KEY_KP8" : 0x60,
"KEY_KP9" : 0x61,
"KEY_KPASTERISK" : 0x55,
"KEY_KPPLUS" : 0x56,
"KEY_KPENTER" : 0x58,
"KEY_KPMINUS" : 0x57,
"KEY_KPDOT" : 0x63,
"KEY_KPSLASH" : 0x54,
"KEY_F1" : 0x3A ,
"KEY_F2" : 0x3B ,
"KEY_F3" : 0x3C ,
"KEY_F4" : 0x3D ,
"KEY_F5" : 0x3E ,
"KEY_F6" : 0x3F ,
"KEY_F7" : 0x40 ,
"KEY_F8" : 0x41 ,
"KEY_F9" : 0x42 ,
"KEY_F10": 0x43,
"KEY_F11": 0x44,
"KEY_F12": 0x45,
"KEY_BACKSPACE" : 0x2A,
"KEY_TAB" : 0x2B,
"KEY_ENTER" : 0x28,
"KEY_CAPSLOCK" : 0x39,
"KEY_ESC" : 0x29,
"KEY_SPACE" : 0x2C,
"KEY_PAGEUP" : 0x4B,
"KEY_PAGEDOWN" : 0x4E,
"KEY_END" : 0x4D,
"KEY_HOME" : 0x4A,
"KEY_LEFT" : 0x50,
"KEY_UP" : 0x52,
"KEY_RIGHT" : 0x4F,
"KEY_DOWN" : 0x51,
"KEY_INSERT" : 0x49,
"KEY_DELETE" : 0x4C,
"KEY_NUMLOCK" : 0x53,
"KEY_GRAVE" : 0x35,
"KEY_BACKSLASH" : 0x31,
"KEY_LEFTBRACE" : 0x2F,
"KEY_RIGHTBRACE" : 0x30,
"KEY_SLASH" : 0x38,
"KEY_COMMA" : 0x36,
"KEY_DOT" : 0x37,
"KEY_SEMICOLON" : 0x33,
"KEY_APOSTROPHE" : 0x34,
"KEY_MINUS" : 0x2D,
"KEY_EQUAL" : 0x2E,
"KEY_SYSRQ" : 0x46,
"KEY_SCROLLLOCK" : 0x47,
"KEY_PAUSE" : 0x48,
}
def ispress (str):
if str :
if str.find('down') != -1:
return True
if str.find('hold') != -1:
return True
if str.find('up') != -1:
return False
def detectInputKey(devpath, msgq):
dev = InputDevice(devpath)
keylist = [0] * 9
print(keylist)
while True:
for event in dev.read_loop():
if event.type == evdev.ecodes.EV_KEY:
msg = str(evdev.categorize(event))
sendstr = re.findall(r"(\([^\)]*\))", msg)
if len(sendstr):
matchkey = sendstr[0][1:-1]
print("matchkey:", matchkey)
ctrkeyval = ctrlkeymap.get(matchkey)
print("ctr key val:", ctrkeyval)
keval = normalkeymap.get(matchkey)
print("key val:", keval)
if ctrkeyval :
if ispress(msg) :
keylist[0] = keylist[0] | ctrkeyval
else :
keylist[0] = keylist[0] & (~ctrkeyval)
elif keval :
if ispress(msg) :
for i in range(2, 8):
if keylist[i] == 0 or keylist[i] == keval:
keylist[i] = keval
break
else :
for i in range(2, 8):
if keylist[i] == keval:
keylist[i] = 0
break
keylist[8] = 0xff
byt = bytes(keylist)
print(keylist, byt)
if msgq :
msgq.put(byt)
if __name__ == "__main__":
detectInputKey('/dev/input/event4', 0)
