通过套接字发送numpy数组 [英] Sending numpy arrays via Socket

问题描述

首先，我想做的是: 使用Socket将照片从我的Raspberry Pi发送到笔记本电脑.

First of all, what I want to do: Sending Photos with Socket from my Raspberry Pi to my laptop.

客户:

#!/usr/bin/python

import socket
import cv2
import numpy as np
import pickle

#Upload image
img = cv2.imread('/path/to/image', 0)

#Turn image into numpy-array
arr = np.asarray(img)

#Receiver ip
ip = "XXX.XXX.X.XXX"

#Set up socket and stuff 
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

#Loop through each array (5 for test)
for each in range(5):

    #Encode each array
    msg = pickle.dumps(arr[each][0])

    #Send msg to ip with port
    s.sendto(msg, (ip, 50000))

s.close()

这里发生了什么: 我上传图片，然后将其变成一个Numpy数组.然后，我获取数组的每一行(每个列表)，然后用pickle对其进行编码"，然后再通过Socket发送.至此一切正常.

What happens here: I upload a picture and then turn it into an Numpy array. Then I take each line of the array (each list) and "encode" it with pickle to send it afterwards via Socket. Everything works fine to this point.

服务器:

#!/usr/bin/python

import socket
import numpy as np
import cPickle as pickle

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(("", 50000)) 

while True:
    data, addr = s.recvfrom(4096)
    conv = pickle.loads(data)
    print conv
    #print np.fromstring(conv,dtype=int)
s.close()

服务器接收编码后的数据，并将其解码回一个Numpy数组(这就是我想要实现的).

The server receives the encoded data and decodes it back into an Numpy array (that's what I want to achieve).

最后，它应该将数组重新转换为图像，但是由于此时的问题，我什至没有涉及到这一部分.

At the end, it should turn the array back into an image, but I didn't even get to that part, because of the issues I have at this point.

我还尝试过先将数组转换为字符串，然后用pickle对其进行编码，然后将其发送，以便在解码时将其作为一个numpy数组.但这不能很好地工作.

I've also tried to turn the array into a string first, encode it with pickle and then send it so when it gets decoded, it is an numpy array. But that didn't work well.

ValueError:字符串大小必须是元素大小的倍数

无论是链接还是指出我的错误，我都会提供任何帮助，我们将不胜感激. 已经为此工作了好几天，没有发现任何可以帮助我解决此问题的方法.

I would appreciate any kind of help, be it a link or pointing out my mistake. Have been working on this for days and haven't found anything that could help me in this matter.

提前谢谢.

推荐答案

您不需要OpenCV和NumPy.相反，只需直接发送文件的字节即可.如果您拥有Python 3.5，甚至可以使用socket.sendfile().

You don't need OpenCV and NumPy for this. Instead, simply send the bytes of the file directly. If you have Python 3.5 you can even use socket.sendfile().

有关更多详细信息，请参见:通过Python中的TCP套接字发送文件

For more detail see: Sending a file over TCP sockets in Python

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