如何从pyserial增量读取数据? [英] How to read data from pyserial incrementally?
问题描述
我正在尝试按 50 字节的块发送图像.我可以通过 Python 跨两个 xbees 串行发送它.现在,我想读取前 50 个字节并将其附加到一个变量,然后在接下来的 50 个字节之后附加它等等.但我根本找不到一个好的解决方案.有什么帮助吗?
I am trying to send an image by chunks of 50 bytes. I am able to send it via Python across two xbees serially. Now , i want to read first 50 bytes and append it to a variable , then after the next 50 bytes , append it and so on . But I cant find a good solution at all . Any help ?
我现在收到错误 f.write(data_stream[i:i+inc]).类型错误必须是字符串或缓冲区.发送方字节数、图像长度为6330.但在接收方是 129.我现在无处可去.## 发件人代码
I am now getting error f.write(data_stream[i:i+inc]). Type error must be string or buffer. The amount of bytes , length of image is 6330 in sending side . But in the receiving side it is 129. I am in no where now . ## Sender Code
import serial
from xbee import XBee
ser = serial.Serial('COM27',9600)
fn='cameraman.jpeg'
f = open(fn, 'rb')
data = f.read()
f.close()
bytes = len(data)
inc=50
for i in range(0, bytes+1, inc):
string=data[i:i+inc]
f.close()
ser.write(string)
## Reciever Side
import serial
ser = serial.Serial(port='COM28', baudrate=9600,timeout=20)
inc=50
fileNames=[]
data_stream = []
while True:
data_stream.append(ser.read(50))
l=len(data_stream)
print l
for i in range(0, l+1, inc):
fn1 = "image%s" % i
fileNames.append(fn1)
f = open(fn1, 'wb')
f.write(data_stream[i:i+inc])
print fn1
x.append(fn1)
f.close()
new_file = 'elmi666_image.jpg'
dataList = []
for fn in fileNames:
f = open(fn, 'rb')
dataList.append(f.read())
f.close()
f = open(new_file, 'wb')
for data in dataList:
f.write(data)
f.close()
推荐答案
使用 pyserial 读取 50 个字节的方法如下:
to read 50 bytes using pyserial here's how you should go:
from serial import Serial
data_stream = []
with Serial(SERIAL_PORT) as ser:
while ser.open():
data_stream.append(ser.read(50))
# use data_stream
它从串行端口中每 50 个字节取一次,并将其附加到 data_stream
列表中.
which takes every 50 bytes from the serial port, and append it in the data_stream
list.
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