无法使用Python套接字编程在计算机之间发送文件

Question

I wrote a socket programming code in Python. It is supposed to be able to send files between different computers. I tested my code on the same computer (ie. by sending files from 2 different folders) and it works. However, when I try to test the code by sending the files from my computer to my friend's computer, I keep getting this error:

 WindowsError: [Error 3] The system cannot find the path specified: 'C://Users//Admin//Desktop//SharedFiles/*.*' 

The error occurs when my Python program tried to access the client_side_folder variable as shown below:

client_side_folder = "C://Users//Admin//Desktop//SharedFiles"

I have also tried replacing the client_side_folder as "C:/Users/Admin/Desktop/SharedFiles" and "C:\\Users\\Admin\\Desktop\\SharedFiles". But both still have the same error.

Does this error got to do with how Python deal with Windows address? If so, how come it works when I tried to send files from 1 folder to another folder in the same computer? Any ideas how I can solve this problem?

EDIT:

The code crashes where it hit the following code:

        def listOfFiles(directory): 
                list_dir = os.listdir(directory) 
                return list_dir

Answer 1

You might find it easier to handle paths in python, through the os.path module. For instance, if you want to access a file in the home directory of a user:

from os.path import expanduser, join

userhome = expanduser( '~' )
desktop = join( userhome, 'Desktop' )
shared_dir = join( desktop, 'SharedFiles' )
file_list = os.listdir( shared_dir )

This also implies that the user executing the script has access privileges to whatever path you're trying to access.

addendum 1 :

Assuming you're using tcp sockets this a sample code for client and server:

server running on your friend's host:

import socket
serversocket = socket.socket( socket.AF_INET, socket.SOCK_STREAM )
serversocket.bind( ( 'localhost', 13000 ) )
serversocket.listen(5) # 5 is the number of client connections that can be queued
while 1:
    #accept connections from outside
    (clientsocket, address) = serversocket.accept()
    # processing of the incoming connection
    ....

client running on your host:

import socket
s = socket.socket( socket.AF_INET, socket.SOCK_STREAM )
s.connect( ( 'friendshost', 13000 ) )
s.send( .... )

Answer 2

The Problem

The code that is breaking is:

list_dir = os.listdir(directory) 

This means the directory pointed to by directory does not exist in your local machine.

In your code, you have

client_files = listOfFiles(client_side)
server_files = listOfFiles(server_side)

which won't work.

You cannot use os.listdir to get the listing of a folder on a remote machine (friend's machine) without using something like \\\\hostname\\\\path .

When you are running the server and client on same machine, it works as both points to the local machine.

Solution

Method 1: Stop trying to get the listings of the remote machine and let the code running on that machine do it for you.

Method 2: Use remote access URL (shared folder or something) to access the details of the remote machine.