B4X

Receive a 16-bit Integer from a Socket

Demonstrates Socket.ReceiveInt16, which reads exactly two bytes as a 16-bit integer and stores the result in the ReceivedInt property. Byte order and signedness are selectable.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

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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


'  Read exactly two bytes as a 16-bit integer and store the result in the ReceivedInt property.
'  The 1st argument selects byte order (True = big-endian); the 2nd selects unsigned interpretation.
Dim bBigEndian As Boolean = True
Dim bUnsigned As Boolean = False
success = socket.ReceiveInt16(bBigEndian, bUnsigned)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If

Log("Received 16-bit integer: " & socket.ReceivedInt)