Question

我定义了一堆单独的十六进制字符，我需要将它们写入设备串行端口。我如何从它们创建一个字节数组？例如：

import serial
# There is a series of predefined hex characters for talking to this device. Some
# These are just some random examples I made up 

START_BYTE = 0x03
END_BYTE = 0x10
RANDOM_BYTE1 = 0xCE
RANDOM_BYTE2 = 0xAB

# Assume I opened port and is connected
sp = serial.open()

# Now in some random method I want to write to the port the sequence of
# [START_BYTE, RANDOM_BYTE1, END_BYTE]
# How would I write this? I tried
sp.write([START_BYTE, RANDOM_BYTE1, END_BYTE])
sp.write(bytearray([START_BYTE, RANDOM_BYTE1, END_BYTE]))
# But I do not get the response on the machine I want.

最终RANDOM_BYTE将是一些数据位，可能是1到10个字节，具体取决于具体情况。所以它会是

[START_BYTE, DATA_BYTES, END_BYTE]

我做错了什么？

我正在使用python 2.7

Answer 1

您需要的是bytes（或str以下......＆lt; 2.6？）。

>>> bytes(bytearray([0x03, 0xce, 0xab]))
'\x03\xce\xab'

从十六进制常量创建一个bytearray

1 个答案: