(VB.NET) Bind and Listen on a Randomly Selected Unused Port

Demonstrates how to bind and listen on a randomly selected unused port.

Note:The ListenPort property used in this example is available starting in Chilkat v9.5.0.59.

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

Dim listenSocket As New Chilkat.Socket

' Pass a value of 0 for the port number to randomly select
' an unused port.
' (The 2nd argument allows for a backlog of 25 pending connection requests when accepting connections.)
Dim success As Boolean = listenSocket.BindAndListen(5555,25)
If (success <> True) Then
    Debug.WriteLine(listenSocket.LastErrorText)
    Exit Sub
End If


' Find out what port was chosen.
' Note: The ListenPort propety was added in Chilkat v9.5.0.59
Dim listenPort As Integer = listenSocket.ListenPort
Debug.WriteLine("Chosen listen port = " & listenPort)