位于的字符设备的“格式”是什么/dev/input/event*?
换句话说，如何解码字符流？如果有一个 Python 示例将不胜感激。
一个简单而原始的阅读器可以使用以下命令完成：
#!/usr/bin/python
import struct
import time
import sys
infile_path = "/dev/input/event" + (sys.argv[1] if len(sys.argv) > 1 else "0")
"""
FORMAT represents the format used by linux kernel input event struct
See https://github.com/torvalds/linux/blob/v5.5-rc5/include/uapi/linux/input.h#L28
Stands for: long int, long int, unsigned short, unsigned short, unsigned int
"""
FORMAT = 'llHHI'
EVENT_SIZE = struct.calcsize(FORMAT)
#open file in binary mode
in_file = open(infile_path, "rb")
event = in_file.read(EVENT_SIZE)
while event:
(tv_sec, tv_usec, type, code, value) = struct.unpack(FORMAT, event)
if type != 0 or code != 0 or value != 0:
print("Event type %u, code %u, value %u at %d.%d" % \
(type, code, value, tv_sec, tv_usec))
else:
# Events with code, type and value == 0 are "separator" events
print("===========================================")
event = in_file.read(EVENT_SIZE)
in_file.close()
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