如何使用Python获取原始的USB键盘数据？

我正在Python中使用PyUSB,因为我将不得不监听USB端口以从电子卡中检索数据.目前,我必须通过读取连接到Raspberry-Pi的小键盘(USB连接)的直接输入来训练自己.当然,我不想读取键入的字符串,例如,我希望获得ASCII码.我只是不知道如何从USB键盘读取输入.

我已经找到了一些片段：

import usb.core
import usb.util

VENDOR_ID = 0x0922
PRODUCT_ID = 0x8003

# find the USB device
device = usb.core.find(idVendor=VENDOR_ID,
                       idProduct=PRODUCT_ID)

# use the first/default configuration
device.set_configuration()
# first endpoint
endpoint = device[0][(0,0)][0]

# read a data packet
attempts = 10
data = None
while data is None and attempts > 0:
    try:
        data = device.read(endpoint.bEndpointAddress,
                           endpoint.wMaxPacketSize)
    except usb.core.USBError as e:
        data = None
        if e.args == ('Operation timed out',):
            attempts -= 1
            continue

print data

如果我取消注释以下行“ device.set_configuration()”,这会导致“设备正忙”异常,那么我会收到错误16“设备正忙”或根本不显示任何错误…(我确实用键盘的VENDOR_ID和PRODUCT_ID替换了ids)

解决方法:

正如您提到的Raspberry Pi一样,我假设您使用的是Linux.您可以使用python-evdev从/ dev / input /中的事件设备读取数据.

例如：

from evdev import InputDevice, categorize, ecodes

device = InputDevice("/dev/input/event3") # my keyboard
for event in device.read_loop():
    if event.type == ecodes.EV_KEY:
        print(categorize(event))

输出：

key event at 1462881252.506405, 30 (KEY_A), up
key event at 1462881252.541371, 31 (KEY_S), up
key event at 1462881252.616399, 31 (KEY_S), down
key event at 1462881252.674422, 22 (KEY_U), down
key event at 1462881252.730418, 31 (KEY_S), up
key event at 1462881252.745558, 22 (KEY_U), up
key event at 1462881252.808419, 50 (KEY_M), down
key event at 1462881252.914552, 23 (KEY_I), down
key event at 1462881252.925388, 50 (KEY_M), up
key event at 1462881253.003579, 49 (KEY_N), down
key event at 1462881253.066418, 34 (KEY_G), down

标签：pyusb,python
来源： https://codeday.me/bug/20191027/1941450.html