Send a 4-byte Length Prefix over a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.SendCount, which sends a four-byte length prefix in network byte order. This is typically used to tell the peer how many bytes follow.

Dim success As Boolean = False

Dim socket As ChilkatSocket
socket.Initialize("socket")

'  Connect to the server using TLS.
Dim bTls As Boolean = True
Dim maxWaitMs As Int = 5000
success = socket.Connect("example.com", 5000, bTls, maxWaitMs)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If


'  Send a four-byte length prefix in network byte order.  A common framing pattern is to send the
'  number of bytes in a message before the message itself, so the peer knows exactly how many bytes
'  to read.
Dim messageLength As Int = 512
success = socket.SendCount(messageLength)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If

Log("Length prefix sent.")