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VBScript Examples

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(VBScript) Async Task Chain

Demonstrates how to combine a sequence of asynchronous tasks into a single task chain to be run in a background thread.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

'  All Chilkat classes can be unlocked at once at the beginning of a program
'  by calling UnlockBundle.  It requires a Bundle unlock code.
set chilkatGlob = CreateObject("Chilkat_9_5_0.Global")
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
If (success <> 1) Then
    outFile.WriteLine(chilkatGlob.LastErrorText)
    WScript.Quit
End If

set mailman = CreateObject("Chilkat_9_5_0.MailMan")

'  Set the POP3 server's hostname
mailman.MailHost = "pop.someMailServer.com"

'  Set the POP3 login/password and any other requirements..
mailman.PopUsername = "myLogin"
mailman.PopPassword = "myPassword"
mailman.PopSsl = 1
mailman.MailPort = 995

'  Connect to the POP3 server:
success = mailman.Pop3BeginSession()
If (Not success) Then
    outFile.WriteLine(mailman.LastErrorText)
    WScript.Quit
End If

'  Get the number of messages in the mailbox.
numMessages = mailman.GetMailboxCount()
If (numMessages = 0) Then
    outFile.WriteLine("No email messages in the POP3 mailbox.")
    WScript.Quit
End If

set taskChain = CreateObject("Chilkat_9_5_0.TaskChain")

'  Create async task objects to fetch each email message
'  by its sequence number

For i = 1 To numMessages

    ' task is a Chilkat_9_5_0.Task
    Set task = mailman.FetchByMsgnumAsync(i)
    If (task Is Nothing ) Then
        outFile.WriteLine(mailman.LastErrorText)
        WScript.Quit
    End If

    '  Append each task to the task chain.
    success = taskChain.Append(task)
    If (Not success) Then
        outFile.WriteLine(taskChain.LastErrorText)
        WScript.Quit
    End If

Next

'  At this point, no tasks have actually started running.
'  All we've done so far is to create tasks for the work that will be done
'  when the task chain is run.

'  Start the task chain running in a background thread.
'  Each task is run one after the other (on the same background thread) until all tasks have completed.
'  The task chain will stop at the first task that fails.
taskChain.StopOnFailedTask = 1
success = taskChain.Run()
If (Not success) Then
    outFile.WriteLine(taskChain.LastErrorText)
    WScript.Quit
End If

'  The application is now free to do anything else
'  while the emails are being downloaded

'  For this example, we'll simply sleep and periodically
'  check to see if the taskchain if finished.
Do While taskChain.Finished <> 1

    '  Sleep 100 ms.
    taskChain.SleepMs 100

Loop

'  A finished task chain could be one that was canceled, aborted, or truly finished.

'  If the task chain "completed", then it ran to completion.  A "completed" task will
'  have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
'  been aborted or canceled:
If (taskChain.StatusInt <> 7) Then
    outFile.WriteLine("Task did not complete.")
    outFile.WriteLine("task chain status: " & taskChain.Status)
    WScript.Quit
End If

set email = CreateObject("Chilkat_9_5_0.Email")

numTasks = taskChain.NumTasks
taskIdx = 0

Do While (taskIdx < numTasks)

    ' task is a Chilkat_9_5_0.Task
    Set task = taskChain.GetTask(taskIdx)

    '  Load the email object with email downloaded by this task.
    success = email.LoadTaskResult(task)
    If (Not success) Then
        outFile.WriteLine("Failed to load email object for task.")
    Else
        outFile.WriteLine(email.From & "; " & email.Subject)
    End If

    taskIdx = taskIdx + 1
Loop

outFile.Close

 

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