B4X

Receive a 32-bit Integer from a Socket

Demonstrates Socket.ReceiveInt32, which reads exactly four bytes as a signed 32-bit integer and stores the result in the ReceivedInt property. Byte order is 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 four bytes as a signed 32-bit integer and store the result in the ReceivedInt
'  property.  The argument selects byte order (True = big-endian, network byte order).
Dim bBigEndian As Boolean = True
success = socket.ReceiveInt32(bBigEndian)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If

Log("Received 32-bit integer: " & socket.ReceivedInt)