AutoIt

Cancel Async Task if not Completed after a Max Time

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Demonstrates how to wait a maximum amount of time for an asynchronous task to completed. If not completed in the allotted amount of time, the task is cancelled. AutoIt

Local $bSuccess = False

; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oHttp = ObjCreate("Chilkat.Http")

; Set some timeouts, in seconds:
$oHttp.ConnectTimeout = 15
$oHttp.ReadTimeout = 15

; Wait a max time of 2 seconds for the task.
; In this example, it's an unreasonably small amount of time,
; which means the task will get cancelled.
Local $iWaitMaxMs = 2000

; We're just going to download for 2 seconds and then cancel.
; Substitute your own URL with a large enough file for testing..
Local $sDownloadUrl = "http://download.mono-project.com/archive/4.6.1/windows-installer/mono-4.6.1.5-gtksharp-2.12.38-win32-0.msi"

Local $oTask = $oHttp.DownloadAsync($sDownloadUrl,"qa_output/mono.msi")
$oTask.Run()

; Wait a maximum of waitMaxMs for the task (i.e. the HTTP download) to complete.
; The Wait method returns when the task has been canceled, aborted, or completed, or when the max allotted time has passed.
$oTask.Wait($iWaitMaxMs)

; At this point, the download may or may not have completed.  
; Rather than checking the Task status, we can call task.Cancel because
; if the Task is no longer running (because it already completed, was canceled or aborted), then the 
; call to Cancel is a NO-OP (meaning it does nothing and the Task's status is unaffected).
; Also, task.Cancel returns True if the task was in the "queued" or "running" state and was canceled or aborted. 
; The method returns False if the task has any other status.
Local $bWasCanceled = $oTask.Cancel()
If ($bWasCanceled = True) Then
    ConsoleWrite("The HTTP download took too long and was canceled." & @CRLF)
Else
    ; Find out what happened.
    If ($oTask.StatusInt = 7) Then
        ; The task completed, which means the background thread's call to Download completed
        ; with success or failure.  Find out which...
        $bSuccess = $oTask.GetResultBool()
        If ($bSuccess = True) Then
            ConsoleWrite("Download successful!" & @CRLF)
        Else
            ConsoleWrite("Download failed prior to waitMaxMs..." & @CRLF)
            ConsoleWrite($oTask.ResultErrorText & @CRLF)
        EndIf

    Else
        ; The task must've been canceled or aborted by some other means..
        ConsoleWrite("Task did not complete.  Final status: " & $oTask.Status & @CRLF)
    EndIf

EndIf