VBScript

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. VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

' 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.
set bdToSend = CreateObject("Chilkat.BinData")
success = bdToSend.LoadFile("somePath/someFile.dat")
' Assume success for the example...

set sndSock = CreateObject("Chilkat.Socket")
bUseTls = 1
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.NumBytes
bBigEndian = 1
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 = 0) Then
    outFile.WriteLine(sndSock.LastErrorText)
    WScript.Quit
End If

' Did the receiver get the correct number of bytes?
If (sndSock.ReceivedInt <> numBytes) Then
    outFile.WriteLine("The receiver did not acknowledge with the correct number of bytes.")
    WScript.Quit
End If

outFile.WriteLine("File sent!")

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

set listenSock = CreateObject("Chilkat.Socket")

success = listenSock.BindAndListen(5555,25)
If (success = 0) Then
    outFile.WriteLine(listenSock.LastErrorText)
    WScript.Quit
End If

' Get the next incoming connection
' Wait a maximum of 20 seconds (20000 millisec)
set rcvSock = CreateObject("Chilkat.Socket")
success = listenSock.AcceptNext(20000,rcvSock)
If (success = 0) Then
    outFile.WriteLine(listenSock.LastErrorText)
    WScript.Quit
End If

' The sender will first send the big-endian integer for the number of bytes
' that are forthcoming..
success = rcvSock.ReceiveInt32(bBigEndian)
If (success <> 1) Then
    outFile.WriteLine(rcvSock.LastErrorText)
    WScript.Quit
End If

numBytesComing = rcvSock.ReceivedInt

' Receive that many bytes..
set bdReceived = CreateObject("Chilkat.BinData")
success = rcvSock.ReceiveBdN(numBytesComing,bdReceived)
If (success <> 1) Then
    outFile.WriteLine(rcvSock.LastErrorText)
    WScript.Quit
End If

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

' Close the connection.
maxWaitMs = 20
success = rcvSock.Close(maxWaitMs)

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

outFile.WriteLine("File received!")

outFile.Close