I have a RPi which I intented to use it to crawl data. The development environment in RPi is very bad, so I did my programing in PC. This lead to an issue that I need to transfer the distribution from my PC to RPi. I does not want to use thumbdrive as the RPi will not be located near my PC. So I wrote an application to transfer file from my PC to RPi.

server is the receiver and client is the transmitter.
I also take care of if the file in a subdirectory.

server

import socket

import os

print('Waiting for clinet to connect...')

c = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

c.bind(('', 1234))

c.listen(1)

s, a = c.accept()

print('Connected. Going to receive file.')

s.sendall('getfilename')

filename = s.recv(1024)

if '/' in filename:

    dir = os.path.dirname(filename)

    try:

        os.stat(dir)

    except:

        print('Directory does not exist. Creating directory.')

        os.mkdir(dir)

f = open(filename, 'wb')

print('Filename: ' + filename)

while True:

    s.sendall('getfile')

    size = int(s.recv(16))

    print('Total size: ' + str(size))

    recvd = ''

    while size > len(recvd):

        data = s.recv(1024)

        if not data:

            break

        recvd += data

        f.write(data)

        #print(len(recvd))

    break

s.sendall('end')

print('File received.')

s.close()

c.close()

f.close()

client

import socket

import sys

if len(sys.argv) > 1 :

    print('Trying to connect...')

    s = socket.socket()

    s.connect(('127.0.0.1', 1234))

    print('Connected. Wating for command.')

    while True:

        cmd = s.recv(32)

        if cmd == 'getfilename':

            print('"getfilename" command received.')

            s.sendall(sys.argv[1])

        if cmd == 'getfile':

            print('"getfile" command received. Going to send file.')

            with open(sys.argv[1], 'rb') as f:

                data = f.read()

            s.sendall('%16d' % len(data))

            s.sendall(data)

            print('File transmission done.')

        if cmd == 'end':

            print('"end" command received. Teminate.')

            break