Visual Basic 6.0

TCP Socket Send Byte and Receive Byte

Demonstrates the Chilkat Socket ReceiveByte and SendByte method. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim sock As New ChilkatSocket

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

Dim useTls As Long
useTls = 0
Dim port As Long
port = 4242
Dim maxWaitMs As Long
maxWaitMs = 5000
success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs)
If (success = 0) Then
    Debug.Print sock.LastErrorText
    Exit Sub
End If

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

' Send a byte.
success = sock.SendByte(96)

' The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
success = 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 Long
treatAsUnsignedInt = 1
success = sock.ReceiveByte(treatAsUnsignedInt)
If (success = 0) Then
    Debug.Print sock.LastErrorText
    Exit Sub
End If

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

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

' Should be decimal 10.
Debug.Print sock.ReceivedInt