VB.NET

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. 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 26 bytes contained in a Chilkat BinData
Dim bdToSend As New Chilkat.BinData
Dim i As Integer = 0
Dim byteVal As Integer = 65
While i < 26
    bdToSend.AppendByte(byteVal)
    byteVal = byteVal + 1
    i = i + 1
End While
' Send the contents of the BinData
' Pass zero's in the 2nd and 3rd arguments to send the entire contents of the BinData.
sock.SendBd(bdToSend,0,0)

' 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 bytes back..
Dim bdRecv As New Chilkat.BinData
' Receive the 26 bytes previously sent, plus the LF char.
success = sock.ReceiveBdN(27,bdRecv)
If (success = False) Then
    Debug.WriteLine(sock.LastErrorText)
    Exit Sub
End If


' Show the contents of bdRecv in hex format
Debug.WriteLine(bdRecv.GetEncoded("hex"))

' Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A