B4X

Poll a Socket for Available Data

Demonstrates Socket.PollDataAvailable, which performs a nonblocking check for readable activity and returns whether data or another read-ready condition is present.

Background. This lets an application check for incoming data without blocking, for example in an event loop that services multiple tasks.

Chilkat B4X Downloads

Download Chilkat for B4X

B4X

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


'  Perform a nonblocking check for readable data.  Returns True when data or another read-ready
'  condition is present, and False when nothing is immediately available.
Dim bAvailable As Boolean = socket.PollDataAvailable
If bAvailable <> True Then
    Log("No data is immediately available.")
Else
    Log("Data is available to read.")
End If