Xojo Plugin

Poll a Socket for Available Data

See more Socket/SSL/TLS Examples

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.

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Xojo Plugin

Dim success As Boolean
success = False

Dim socket As New Chilkat.Socket

//  Connect to the server using TLS.
Dim bTls As Boolean
bTls = True
Dim maxWaitMs As Int32
maxWaitMs = 5000
success = socket.Connect("example.com",5000,bTls,maxWaitMs)
If (success = False) Then
    System.DebugLog(socket.LastErrorText)
    Return
End If

//  Perform a nonblocking check for readable data.  Returns 1 when data or another read-ready
//  condition is present, and 0 when nothing is immediately available.
Dim bAvailable As Boolean
bAvailable = socket.PollDataAvailable()
If (bAvailable <> True) Then
    System.DebugLog("No data is immediately available.")
Else
    System.DebugLog("Data is available to read.")
End If