使用套接字编程通过网络从客户端向服务器发送图像在服务器端已损坏

Question

我的任务是使用python套接字编程将一些图像通过网络发送到其他计算机。但是这样做会导致服务器端映像损坏。我不明白为什么我的图像在服务器计算机上接收时会被损坏。以下是我在两台不同的计算机上尝试过的代码。

我尝试了不同的编码技术，例如base64，utf8等，但无法获得预期的结果

服务器代码

import socket
import sys
import traceback
from threading import Thread
import base64

def main():
    start_server()

def start_server():
    host = "172.16.15.52"
    port = 8220        # arbitrary non-privileged port
    soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    soc.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)   # SO_REUSEADDR flag tells the kernel to reuse a local socket in TIME_WAIT state, without waiting for its natural timeout to expire
    print("Socket created")

    try:
        soc.bind((host, port))
    except:
        print("Bind failed. Error : " + str(sys.exc_info()))
        sys.exit()
    soc.listen(5)       # queue up to 5 requests
    print("Socket now listening")
    # infinite loop- do not reset for every requests
    while True:
        connection, address = soc.accept()
        ip, port = str(address[0]), str(address[1])
        print("Connected with " + ip + ":" + port)

        try:
            Thread(target=client_thread, args=(connection, ip, port)).start()
        except:
            print("Thread did not start.")
            traceback.print_exc()

    soc.close()

def client_thread(connection, ip, port, max_buffer_size = 64000):
    is_active = True

    while is_active:
        client_input = receive_input(connection, max_buffer_size)

        if "--quit--" in client_input:
            connection.close()
            is_active = False
        else:
            connection.sendall("-".encode("utf8"))

def receive_input(connection, max_buffer_size):
    client_input = connection.recv(max_buffer_size)
    imageData = client_input
    fh = open("result_img/imageToSave.png","wb")
    fh.write(imageData.decode('base64'))
    fh.close()
    client_input_size = sys.getsizeof(client_input)

    if client_input_size > max_buffer_size:
        print("The input size is greater than expected {}".format(client_input_size))

    decoded_input = client_input.decode("utf8").rstrip()  # decode and strip end of line
    result = process_input(decoded_input)

    return result

def process_input(input_str):

    return str(input_str)

if __name__ == "__main__":
    main()

客户代码

import socket
import sys
import random
from time import time
import os
import base64

def main():
    soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    host = "172.16.15.52"
    port = 8220

    try:
        soc.connect((host, port))
    except:
        print("Connection error")
        sys.exit()

    fileNames = os.listdir('record/result_img/')
    for i in fileNames:
    with open('record/result_img/'+i, "rb") as imageFile:
        str = base64.b64encode(imageFile.read())
        if len(str) <= 62000:   # size of the image should be less than 64kb due to limitation of TCP packets
                message = str
        soc.sendall(message)
        if soc.recv(64000).decode("utf8") == "-":
            pass        # null operation

if __name__ == "__main__":
    main()

预期结果是应该在服务器端以相似的方式接收客户端的图像