通过Python tcp套接字传输以阿拉伯语标题的文件时的ValueError

Question

我正在构建一个套接字程序来在两台计算机之间传输文件。具有英文标题的文件成功传输，但当我尝试发送阿拉伯文标题文件（例如وثيقة。docx）时，我得到一长串的ValueErrors，从以下开始：

invalid literal for int() with base 2: b'.docx000000000000000000010000001'

invalid literal for int() with base 2: b'10001PK\x03\x04\x14\x00\x08\x08\x08\x00\xe0'

我的代码是：服务器：

import socket

serversock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = 'localhost'
port = 9000
serversock.bind((host,port))
filename = ""
serversock.listen(10)
print("Waiting for a connection.....")

clientsocket, addr = serversock.accept()
print("Got a connection from %s" % str(addr))

while True:
    try:
        size = clientsocket.recv(16) # Note that you limit your filename length to 255 bytes.
        if not size:
            clientsocket, addr = serversock.accept()
            print("Got a connection from %s" % str(addr))
            continue
        size = int(size, 2)
        print('SIZE', size)
        filename = clientsocket.recv(size)
        print('filename', filename)
        filesize = clientsocket.recv(32)
        print('FILESIZE', filesize, 'TYPE', type(filesize))
        filesize = int(filesize, 2) ##########
        file_to_write = open(filename, 'wb')
        chunksize = 4096
        while filesize > 0:
            if filesize < chunksize:
                chunksize = filesize
            data = clientsocket.recv(chunksize)
            file_to_write.write(data)
            filesize -= len(data)

        file_to_write.close()
        print('File (%s) received successfully' % filename.decode('utf-8'))
    except ValueError as verr:
        print(verr)
        #continue
    except FileNotFoundError:
        print('FileNotFoundError')
        #continue
serversock.close()

客户：

进口

 socket
import os
from file_walker import files_to_transmit

def transmit(host, port):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        s.connect((host, port))
        directory = files_to_transmit()
        for file in directory:
            filename = file
            size = len(filename.split('/')[-1]) # split() to get bare file name to transmit to server
            size = bin(size)[2:].zfill(16) # encode filename size as 16 bit binary
            s.send(size.encode('utf-8'))
            s.send(filename.split('/')[-1].encode('utf-8')) # split() to get bare file name

            filename = file
            filesize = os.path.getsize(filename)
            filesize = bin(filesize)[2:].zfill(32) # encode filesize as 32 bit binary
            s.send(filesize.encode('utf-8'))

            file_to_send = open(filename, 'rb')

            l = file_to_send.read()
            s.sendall(l)
            file_to_send.close()
            print('File Sent')

        s.close()
    except ConnectionRefusedError:
        print('ConnectionRefusedError: Server may not be running')

    except ValueError as e:
        print(e)

transmit('localhost', 9000)

这里有什么问题？请帮忙。

Answer 1

您以标题的unicode字符发送大小，然后尝试以utf-8编码发送它。例如，您的示例：

title = 'وثيقة.docx'
print(len(title), len(title.encode('utf8')))

给

10 15

对等体仅使用10个字节作为文件名，并将使用剩余的5个作为文件大小的开头。并且会阻止.docx不是二进制数字的开头。怎么了...

修复很容易，在计算字节长度之前构建字节字符串：

    ...
    for file in directory:
        filename = file.split('/')[-1].encode('utf_8') # split() to get bare file name
        size = len(filename)

        size = bin(size)[2:].zfill(16) # encode filename size as 16 bit binary
        s.send(size.encode('utf-8'))
        s.send(filename) 
        ...

Answer 2

在我的经历中遇到了类似的问题。我的建议是使用算法来编码和解码像base64这样的文件。

在程序的某个地方，您正在读取文件以将其保存在内存中并发送第二步。那么只需阅读编码

import base64

with open("yourfile.ext", "rb") as image_file:
    encoded_string = base64.b64encode(image_file.read())

显然在另一方面，你需要在磁盘上解码和写入。您还可以对文件标题进行编码和解码，以避免ValueError