CkPython Requires Chilkat v11.0.0+

Transfer a File using Sockets (TLS or non-TLS)

See more Socket/SSL/TLS Examples

Demonstrates how to two programs, one a socket writer and the other a socket reader, can transfer a file. The connection can be TLS or a regular non-encrypted TCP connection. CkPython

import sys
import chilkat

success = False

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  On the sending side, we'll load the file into a BinData object and send.
#  On the receiving side, we'll read from the socket connection into a BinData, and save to a file.
#  This example assumes the file is not crazy-large, and that the entire contents
#  can fit into memory.  
#  (If the file is too large for memory, there are other ways to send. It just involves streaming or 
#  sending the file chunk-by-chunk..)

#  This section of code is for the sender.
bdToSend = chilkat.CkBinData()
success = bdToSend.LoadFile("somePath/someFile.dat")
#  Assume success for the example...

sndSock = chilkat.CkSocket()
bUseTls = True
port = 5555
maxWaitMs = 5000
success = sndSock.Connect("some_domain_or_ip.com",port,bUseTls,maxWaitMs)
#  Assume success for the example...

#  Tell the receiver how many bytes are coming.
numBytes = bdToSend.get_NumBytes()
bBigEndian = True
success = sndSock.SendInt32(numBytes,bBigEndian)

#  Send the file data (sends the entire contents of bdToSend).
success = sndSock.SendBd(bdToSend,0,0)

#  Get an acknowledgement.
success = sndSock.ReceiveInt32(bBigEndian)
if (success == False):
    print(sndSock.lastErrorText())
    sys.exit()

#  Did the receiver get the correct number of bytes?
if (sndSock.get_ReceivedInt() != numBytes):
    print("The receiver did not acknowledge with the correct number of bytes.")
    sys.exit()

print("File sent!")

#  ------------------------------------------------------------------------------------
#  The code below is for the receiving side (running on some other computer..)

listenSock = chilkat.CkSocket()

success = listenSock.BindAndListen(5555,25)
if (success == False):
    print(listenSock.lastErrorText())
    sys.exit()

#  Get the next incoming connection
#  Wait a maximum of 20 seconds (20000 millisec)
rcvSock = chilkat.CkSocket()
success = listenSock.AcceptNext(20000,rcvSock)
if (success == False):
    print(listenSock.lastErrorText())
    sys.exit()

#  The sender will first send the big-endian integer for the number of bytes
#  that are forthcoming..
success = rcvSock.ReceiveInt32(bBigEndian)
if (success != True):
    print(rcvSock.lastErrorText())
    sys.exit()

numBytesComing = rcvSock.get_ReceivedInt()

#  Receive that many bytes..
bdReceived = chilkat.CkBinData()
success = rcvSock.ReceiveBdN(numBytesComing,bdReceived)
if (success != True):
    print(rcvSock.lastErrorText())
    sys.exit()

#  Acknowledge the sender by sending back the number of bytes we received.
success = rcvSock.SendInt32(bdReceived.get_NumBytes(),bBigEndian)

#  Close the connection.
maxWaitMs = 20
rcvSock.Close(maxWaitMs)

#  Save the received data to a file.
success = bdReceived.WriteFile("somePath/someFile.dat")
#  Assume success for the example...

print("File received!")