VB.NET

TCP Socket Send Byte and Receive Byte

Demonstrates the Chilkat Socket ReceiveByte and SendByte method. VB.NET

Dim success As Boolean = False

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

Dim sock As New Chilkat.Socket

' --------------------------------------------------------------------
' This example uses the public TCP echo service at https://tcpbin.com/
' --------------------------------------------------------------------

Dim useTls As Boolean = False
Dim port As Integer = 4242
Dim maxWaitMs As Integer = 5000
success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs)
If (success = False) Then
    Debug.WriteLine(sock.LastErrorText)
    Exit Sub
End If


' Wait a max of 2 seconds for a response..
sock.MaxReadIdleMs = 2000

' Send a byte.
sock.SendByte(96)

' The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
sock.SendByte(10)

' The echo server will echo back whatever is sent to it.
' We should be able to read the same byte back..
' After successfully reading, the byte value is available in the ReceivedInt property.
Dim treatAsUnsignedInt As Boolean = True
success = sock.ReceiveByte(treatAsUnsignedInt)
If (success = False) Then
    Debug.WriteLine(sock.LastErrorText)
    Exit Sub
End If


' Let's look at the value of the byte received.  It should be 96.
Debug.WriteLine(sock.ReceivedInt)

' The echo server also echoed the LF back.
success = sock.ReceiveByte(treatAsUnsignedInt)
' Assuming success..

' Should be decimal 10.
Debug.WriteLine(sock.ReceivedInt)