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

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.

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[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

#  This example assumes the Chilkat Socket API to have been previously unlocked.
#  See Socket 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 = New-Object Chilkat.BinData
$success = $bdToSend.LoadFile("somePath/someFile.dat")
#  Assume success for the example...

$sndSock = New-Object Chilkat.Socket
$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.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 -ne $true) {
    $($sndSock.LastErrorText)
    exit
}

#  Did the receiver get the correct number of bytes?
if ($sndSock.ReceivedInt -ne $numBytes) {
    $("The receiver did not acknowledge with the correct number of bytes.")
    exit
}

$("File sent!")

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

$listenSock = New-Object Chilkat.Socket

$success = $listenSock.BindAndListen(5555,25)
if ($success -ne $true) {
    $($listenSock.LastErrorText)
    exit
}

#  Get the next incoming connection
#  Wait a maximum of 20 seconds (20000 millisec)

$rcvSock = $listenSock.AcceptNextConnection(20000)
if ($rcvSock -eq $null ) {
    $($listenSock.LastErrorText)
    exit
}

#  The sender will first send the big-endian integer for the number of bytes
#  that are forthcoming..
$success = $rcvSock.ReceiveInt32($bBigEndian)
if ($success -ne $true) {
    $($rcvSock.LastErrorText)

    exit
}

$numBytesComing = $rcvSock.ReceivedInt

#  Receive that many bytes..
$bdReceived = New-Object Chilkat.BinData
$success = $rcvSock.ReceiveBdN($numBytesComing,$bdReceived)
if ($success -ne $true) {
    $($rcvSock.LastErrorText)

    exit
}

#  Acknowledge the sender by sending back the number of bytes we received.
$success = $rcvSock.SendInt32($bdReceived.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...

$("File received!")