Check Whether a Socket Is Writable

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Demonstrates Socket.CheckWriteable, which waits for the connected socket to become writable. It returns 1 if writable, 0 if it did not become writable before the timeout, or -1 on error.

Dim success As Boolean = False

Dim socket As New Chilkat.Socket

'  Connect to the server using TLS.
Dim bTls As Boolean = True
Dim maxWaitMs As Integer = 5000
success = socket.Connect("example.com",5000,bTls,maxWaitMs)
If (success = False) Then
    Debug.WriteLine(socket.LastErrorText)
    Exit Sub
End If


'  Wait up to 5 seconds for the socket to become writable.  Returns 1 if writable, 0 if it did not
'  become writable before the timeout, or -1 on error.
Dim writable As Integer = socket.CheckWriteable(5000)
If (writable < 0) Then
    Debug.WriteLine(socket.LastErrorText)
    Exit Sub
End If

If (writable <> 1) Then
    Debug.WriteLine("The socket did not become writable before the timeout.")
    Exit Sub
End If

Debug.WriteLine("The socket is writable.")