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Classic ASP Examples

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(Classic ASP) 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

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
' 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 = Server.CreateObject("Chilkat_9_5_0.Global")
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( chilkatGlob.LastErrorText) & "</pre>"
    Response.End
End If

set mailman = Server.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
    Response.Write "<pre>" & Server.HTMLEncode( mailman.LastErrorText) & "</pre>"
    Response.End
End If

' Get the number of messages in the mailbox.
numMessages = mailman.GetMailboxCount()
If (numMessages = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "No email messages in the POP3 mailbox.") & "</pre>"
    Response.End
End If

set taskChain = Server.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 (mailman.LastMethodSuccess = 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( mailman.LastErrorText) & "</pre>"
        Response.End
    End If

    ' Append each task to the task chain.
    success = taskChain.Append(task)
    If (Not success) Then
        Response.Write "<pre>" & Server.HTMLEncode( taskChain.LastErrorText) & "</pre>"
        Response.End
    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
    Response.Write "<pre>" & Server.HTMLEncode( taskChain.LastErrorText) & "</pre>"
    Response.End
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
    Response.Write "<pre>" & Server.HTMLEncode( "Task did not complete.") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "task chain status: " & taskChain.Status) & "</pre>"
    Response.End
End If

set email = Server.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
        Response.Write "<pre>" & Server.HTMLEncode( "Failed to load email object for task.") & "</pre>"
    Else
        Response.Write "<pre>" & Server.HTMLEncode( email.From & "; " & email.Subject) & "</pre>"
    End If

    taskIdx = taskIdx + 1
Loop

%>
</body>
</html>

 

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