Classic ASP

Check Whether a Socket Is Writable

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.

Background. A maxWaitMs of 0 performs a nonblocking poll. This is useful for flow control before attempting a large send.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

set socket = Server.CreateObject("Chilkat.Socket")

'  Connect to the server using TLS.
bTls = 1
maxWaitMs = 5000
success = socket.Connect("example.com",5000,bTls,maxWaitMs)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( socket.LastErrorText) & "</pre>"
    Response.End
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.
writable = socket.CheckWriteable(5000)
If (writable < 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( socket.LastErrorText) & "</pre>"
    Response.End
End If

If (writable <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "The socket did not become writable before the timeout.") & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "The socket is writable.") & "</pre>"

%>
</body>
</html>