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Check Whether a Socket Is Writable

See more Socket/SSL/TLS Examples

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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Local $bSuccess = False

$oSocket = ObjCreate("Chilkat.Socket")

;  Connect to the server using TLS.
Local $bTls = True
Local $iMaxWaitMs = 5000
$bSuccess = $oSocket.Connect("example.com",5000,$bTls,$iMaxWaitMs)
If ($bSuccess = False) Then
    ConsoleWrite($oSocket.LastErrorText & @CRLF)
    Exit
EndIf

;  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.
Local $iWritable = $oSocket.CheckWriteable(5000)
If ($iWritable < 0) Then
    ConsoleWrite($oSocket.LastErrorText & @CRLF)
    Exit
EndIf

If ($iWritable <> 1) Then
    ConsoleWrite("The socket did not become writable before the timeout." & @CRLF)
    Exit
EndIf

ConsoleWrite("The socket is writable." & @CRLF)