I'm recently working on a project in which I'm basically making a dropbox clone. The server and client are working fine but I'm having a slight issue. I'm able to transfer a single file from the client to the server but when I try to transfer all the files together it gives me an error after the transfer of the first file so basically my code is only working for a single file. I need to make it work for multiple files. Any help will be appreciated. Here's my code

Server Code

import socket
import thread
import hashlibserversock = socket.socket()
host = socket.gethostname();
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:size = clientsocket.recv(1)filesz = clientsocket.recv(1)if filesz.isdigit():size += fileszfilesize = int(size)else:filesize = int(size)    print filesizefor i in range(0,filesize):if filesz.isdigit():filename += clientsocket.recv(1)else:filename += fileszfilesz = "0"print filename      file_to_write = open(filename, 'wb')while True:data = clientsocket.recv(1024)#print dataif not data:breakfile_to_write.write(data)file_to_write.close()print 'File received successfully'
serversock.close()

Client Code

import socket
import os
import threads = socket.socket() 
host = socket.gethostname()                           
port = 9000
s.connect((host, port))
path = "C:\Users\Fahad\Desktop"
directory = os.listdir(path)
for files in directory:print files  filename = filessize = bytes(len(filename))#print sizes.send(size)s.send(filename)file_to_send = open(filename, 'rb')l = file_to_send.read()s.sendall(l)file_to_send.close()       print 'File Sent'                                              
s.close()                                                                           

Here's the error that I get

Waiting for a connection.....
Got a connection from ('192.168.0.100', 58339)
13
Betternet.lnk
File received successfully
Traceback (most recent call last):File "server.py", line 22, in <module>filesize = int(size)
ValueError: invalid literal for int() with base 10: ''

There are several minor issues in your snippet. Maybe you could do something like this?

import socket
import thread
import hashlibserversock = socket.socket()
host = socket.gethostname();
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:size = clientsocket.recv(16) # Note that you limit your filename length to 255 bytes.if not size:breaksize = int(size, 2)filename = clientsocket.recv(size)filesize = clientsocket.recv(32)filesize = int(filesize, 2)file_to_write = open(filename, 'wb')chunksize = 4096while filesize > 0:if filesize < chunksize:chunksize = filesizedata = clientsocket.recv(chunksize)file_to_write.write(data)filesize -= len(data)file_to_write.close()print 'File received successfully'
serversock.close()

Client:

import socket
import os
import threads = socket.socket()
host = socket.gethostname()
port = 9000
s.connect((host, port))
path = "blah"
directory = os.listdir(path)
for files in directory:print filesfilename = filessize = len(filename)size = bin(size)[2:].zfill(16) # encode filename size as 16 bit binarys.send(size)s.send(filename)filename = os.path.join(path,filename)filesize = os.path.getsize(filename)filesize = bin(filesize)[2:].zfill(32) # encode filesize as 32 bit binarys.send(filesize)file_to_send = open(filename, 'rb')l = file_to_send.read()s.sendall(l)file_to_send.close()print 'File Sent's.close()

Here the client also sends the size of the file. Both size and filesize are encoded as binary strings (you could do another method). The filename length (size) can take values up to 2^16 and the send file can have up to 2^32 byte (that is 2^filesize).