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Collect Completed SSH Commands with QuickCmdCheck

Demonstrates the Chilkat Ssh.QuickCmdCheck method, which waits for any command started by QuickCmdSend to complete. The only argument is the poll timeout in milliseconds; 0 performs a nonblocking check. It returns the channel number of a completed command, -1 when commands are still pending but none finished before the timeout, or -2 when no quick commands remain or an error occurred.

Background: This is the collection half of the concurrent pattern. Each completed channel is reported only once, so looping until -2 drains every outstanding command exactly once. Distinguish the two negative values carefully: -1 simply means "still working, ask again," while -2 means there is nothing left to wait for — or that the connection failed, so check LastErrorText when the distinction matters. Manually opened exec channels are not reported here.

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Local $bSuccess = False

;  Demonstrates the Ssh.QuickCmdCheck method, which waits for any command started by
;  QuickCmdSend to complete.  The only argument is the poll timeout in milliseconds; 0 performs
;  a nonblocking check.

$oSsh = ObjCreate("Chilkat.Ssh")

Local $iSshPort = 22
$bSuccess = $oSsh.Connect("ssh.example.com",$iSshPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  Normally you would not hard-code the password in source.  You should instead obtain it
;  from an interactive prompt, environment variable, or a secrets vault.
Local $sPassword = "mySshPassword"

$bSuccess = $oSsh.AuthenticatePw("mySshLogin",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  Start two commands that will finish at different times.
Local $iChannel1 = $oSsh.QuickCmdSend("sleep 2; echo first done")
If ($iChannel1 < 0) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

Local $iChannel2 = $oSsh.QuickCmdSend("echo second done")
If ($iChannel2 < 0) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  Collect the results as they complete.  The return value is the channel number of a completed
;  command, -1 if commands are still pending but none finished before the timeout, or -2 when
;  no quick commands remain (or an error occurred).
Local $iPollTimeoutMs = 5000
Local $iCompletedChannel = $oSsh.QuickCmdCheck($iPollTimeoutMs)
While $iCompletedChannel <> -2
    If ($iCompletedChannel >= 0) Then
Local $sOutput = $oSsh.GetReceivedText($iCompletedChannel,"utf-8")
        If ($oSsh.LastMethodSuccess = False) Then
            ConsoleWrite($oSsh.LastErrorText & @CRLF)
            Exit
        EndIf

        ConsoleWrite("Channel " & $iCompletedChannel & " finished: " & $sOutput & @CRLF)
    EndIf

    If ($iCompletedChannel = -1) Then
        ConsoleWrite("Still waiting for a command to finish..." & @CRLF)
    EndIf

    $iCompletedChannel = $oSsh.QuickCmdCheck($iPollTimeoutMs)
Wend

ConsoleWrite("All quick commands have been collected." & @CRLF)

$oSsh.Disconnect