Receive File on Socket

Demonstrates how to listen for an incoming socket connection and receive a file. The received file is saved to disk.

Download Chilkat FileAccess ActiveX (freeware)

Download Chilkat Socket ActiveX

Dim listenSocket As New ChilkatSocket

Dim success As Long
success = listenSocket.UnlockComponent("Anything for 30-day trial")
If (success <> 1) Then
    MsgBox "Failed to unlock component"
    Exit Sub
End If

'  Bind to a port and listen for incoming connections:
'  This example will listen at port 5555 and allows for a backlog
'  of 25 pending connection requests.
success = listenSocket.BindAndListen(5555,25)
If (success <> 1) Then
    MsgBox listenSocket.LastErrorText
    Exit Sub
End If

'  Get the next incoming connection
'  Wait a maximum of 20 seconds (20000 millisec)
Dim connectedSocket As ChilkatSocket
Set connectedSocket = listenSocket.AcceptNextConnection(20000)
If (connectedSocket Is Nothing ) Then
    MsgBox listenSocket.LastErrorText
    Exit Sub
End If

'  Set maximum timeouts for reading an writing (in millisec)
connectedSocket.MaxReadIdleMs = 10000
connectedSocket.MaxSendIdleMs = 10000

'  Receive the byte count of the file data that is forthcoming:
Dim fileSize As Long
fileSize = connectedSocket.ReceiveCount()
If (fileSize < 0) Then
    MsgBox connectedSocket.LastErrorText
    Exit Sub
End If

Dim fileData() As Byte
fileData = connectedSocket.ReceiveBytesN(fileSize)
If (connectedSocket.LastMethodFailed = 1) Then
    MsgBox connectedSocket.LastErrorText
    Exit Sub
End If

'  Close the connection.
'  Wait a max of 20 seconds (20000 millsec)
connectedSocket.Close 20000

'  Write the received data to a file.
'  This example receives a GIF image file.
Dim fac As New CkFileAccess

success = fac.WriteEntireFile("received.gif",fileData)
If (success <> 1) Then
    MsgBox listenSocket.LastErrorText
    Exit Sub
End If

MsgBox "success!"