Develop Reference

Downloading a file in a new directory- Socket Programming

I tried as hard is a could to create (or adapt) the following codes so that i can download a file (with any extension) from a server to the client in a new directory (to be more explicit, the client receives the file,downloads it in a new directory). I leave you the initial codes without my modifications,such in that way your changes won't be necessarly easier, but will help me where and why i'm wrong. Pay attention that codes are wrote in python and Linux OS(that's for directory paths). And do not forgot that i'm really new in Linux and Python. I tried many many variants but with many errors. Any help will be apreciated:).
**#CLIENT**
import socket # Import socket module
s = socket.socket() # Create a socket object
host = socket.gethostname() # Get local machine name
port = 60000 # Reserve a port for your service.
s.connect((host, port))
s.send("Hello server!")
with open('received_file', 'wb') as f:
print 'file opened'
while True:
print('receiving data...')
data = s.recv(1024)
print('data=%s', (data))
if not data:
break
# write data to a file
f.write(data)
f.close()
print('Successfully get the file')
s.close()
print('connection closed')
**#SERVER**
import socket # Import socket module
port = 60000 # Reserve a port for your service.
s = socket.socket() # Create a socket object
host = socket.gethostname() # Get local machine name
s.bind((host, port)) # Bind to the port
s.listen(5) # Now wait for client connection.
print 'Server listening....'
while True:
conn, addr = s.accept() # Establish connection with client.
print 'Got connection from', addr
data = conn.recv(1024)
print('Server received', repr(data))
filename='mytext.txt'
f = open(filename,'rb')
l = f.read(1024)
while (l):
conn.send(l)
print('Sent ',repr(l))
l = f.read(1024)
f.close()
print('Done sending')
conn.send('Thank you for connecting')
conn.close()

How to Send a file with keeping its extension through a python socket?

I'm trying to send one file which is txt file through a python socket. I want the txt file which is received by the client keeps its extension which is txt.
Here is my server's side:
import socket
port = 50000
s = socket.socket()
host = "localhost"
s.bind((host, port))
s.listen(5)
print 'Server listening....'
while True:
conn, addr = s.accept()
print 'Got connection from', addr
data = conn.recv(1024)
print('Server received', repr(data))
filename='file.txt'
f = open(filename,'rb')
while (f):
conn.send(filename)
f.close()
print('Done sending')
conn.close()
Here is my client's side:
import socket # Import socket module
s = socket.socket() # Create a socket object
host = "localhost" #Ip address that the TCPServer is there
port = 50000 # Reserve a port for your service every new transfer wants a new port or you must wait.
s.connect((host, port))
s.send("Hello server!")
while True:
print('receiving the file...')
data = s.recv()
if not data:
break
print('Successfully get the file')
s.close()
print('connection closed')
All I found online is either modifying this file or sending a text in that file.

sending file through socket in python 3

In the code below I've tried to send an image using the python socket module in one machine to another machine. So I have 2 files: client.py and Server.py
as I figured it out the problem is when I read the image(as bytes) at the client machine and then the server tries to receive the file, at that moment when sending process is done before the receiving process then the error below occurs at line 13 of the client code:
BrokenPipeError: [Errno 32] Broken pipe
I want to find out what this error is and why does it occur in my code.
Server.py
import socket
host = '192.168.1.35'
port = 5000
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host,port))
s.listen(1)
while True:
conn , addr = s.accept()
data = conn.recv(1024)
with open(r"C:\Users\master\Desktop\music.jpg",'wb') as f:
f.write(data)
# conn.send(b'done')
data = conn.recv(1024)
if not data:
break
conn.send(b'done')
conn.send(b'done')
conn.close()
s.close()
Client.py
import socket
def main():
HOST = '192.168.1.35'
PORT = 5000
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
f = open('/home/taha/Desktop/f.jpg','rb')
data = f.read()
s.sendfile(f)
if s.recv(1024) == b'done':
f.close()
s.close()
if __name__ == '__main__':
main()

You are closing the server connection before the client read the “done”

Windows 10 - VB 5.2.4 with Ubuntu 16.04: Sending files between two VMs with Python

I'm new to python and this time I want to send a file between two VMs, first of all, the VMs are configured with NAT Network, both VMs can ping each other. The codes are the following:
Server side:
#server.py
import socket # Import socket module
port = 60000 # Reserve a port for your service.
s = socket.socket() # Create a socket object
host = socket.gethostname() # Get local machine name
# s.bind((host, port)) # Bind to the port
s.bind(('', port))
s.listen(5) # Now wait for client connection.
print 'Server listening....'
while True:
conn, addr = s.accept() # Establish connection with client.
print 'Got connection from', addr
data = conn.recv(1024)
print('Server received', repr(data))
filename='runbonesi.py'
f = open(filename,'rb')
l = f.read(1024)
while (l):
conn.send(l)
print('Sent ',repr(l))
l = f.read(1024)
f.close()
print('Done sending')
conn.shutdown(socket.SHUT_WR)
print conn.recv(1024)
conn.close()
client side:
#client.py
import socket # Import socket module
s = socket.socket() # Create a socket object
#host = socket.gethostname() # Get local machine name
host = '10.0.2.15'
port = 60000 # Reserve a port for your service.
s.connect((host, port))
with open('received_file', 'wb') as f:
print 'file opened'
while True:
print('receiving data...')
data = s.recv(1024)
print('data=%s', (data))
if not data:
break
# write data to a file
f.write(data)
f.close()
print('Successfully get the file')
s.close()
print('connection closed')
The results can be seen in the following pictures:
Server side:
result on server
Client side:
result on client
The problem is, the client didn't receive the file as .py format, it only received as txt files. Please help me resolve this issue.
Thank you.

After s.connect((host, port)) in the client script you have to write s.send(...) with 'hello', for example. You also forgot to write the file extension '.py' in with open(...) (only if you want to save the file as Python script!). And you also have to add s.send(...) before you close the connection on the client side. 😉

an empty file after sending it to tcp server in python

I am new to python and i am trying to make a multithreded tcp server and client to be able to send files between them. I did write some simple codes for these two programs but every time I get empty file on server's site. The file does create in the folder but when I open it it is blank inside. I also tried to send .png files but windows photoviewer doesn't open them saying they are empty. I didn't find anyone encourting such problem so that's why i am asking
Client.py
import socket # Import socket module
HOST = "localhost" # Host address / name
PORT = 2137 # Reserves port for the service
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect((HOST, PORT))
fileToSend = open('test.txt', 'rb')
print "File ready to be sent"
l = fileToSend.read(1024)
while l:
print "Sending the file"
client.send(l)
l = fileToSend.read(1024)
fileToSend.close() print "done"
client.close()
Server.py
import socket
from threading import Thread
from SocketServer import ThreadingMixIn
import sys
TCPHOST = "localhost"
TCPPORT = 2137
BUFFER_SIZE = 20
class ClientThread(Thread):
def __init__(self, HOST, PORT):
Thread.__init__(self)
self.HOST = HOST
self.PORT = PORT
print "New thread started for " + HOST + " on port " + str(PORT)
def run(self):
f = open('received.py', 'wb')
while True:
try:
data = conn.recv(1024)
except socket.error, e:
print "Error receiving data: %s" % e
sys.exit(1)
while data:
print "Receiving"
f.write(data)
data = conn.recv(1024)
f.close()
try:
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server.bind((TCPHOST, TCPPORT))
print "Socket created"
except socket.error, err:
print "Failed to create socket" % err
threads = []
while True:
server.listen(4)
print "Waiting for connections"
(conn, (HOST, PORT)) = server.accept()
thread = ClientThread(HOST, PORT)
thread.start()
threads.append(thread)
for t in threads:
t.join()

I am not sure what you actually want to do, because I see that you import SocketServer however you are not using it all.
If you are trying to run a simple socket server then the class ClientThread and all the other stuff about threads in that file are not necessary.
The following code in server.py will do the job
import socket
import sys
TCPHOST = "localhost"
TCPPORT = 2137
BUFFER_SIZE = 20
try:
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server.bind((TCPHOST, TCPPORT))
server.listen(4)
print "Socket created"
except socket.error, err:
print "Failed to create socket" % err
while True:
print "Waiting for connections"
(conn, (TCPHOST, TCPPORT)) = server.accept()
try:
while True:
data = conn.recv(1024)
f = open('received.py', 'wb')
if data:
print "Receiving " + data
f.write(data)
else:
f.close()
break;
except socket.error, e:
#pass
print "Error receiving data: %s" % e
#sys.exit(1)
finally:
conn.close()
However if you are trying to implement a threaded TCPServer using the ThreadingMixIn then you need to create a class that subclasses SocketServer and override its handle() function
Python documentation is quite helpful on this
https://docs.python.org/3.5/library/socketserver.html
(ThreadingMixin is at the bottom of the page)