DataFlex

Async Progress Info Log

See more Async Examples

Demonstrates checking for progress info updates when running a task asynchronously. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoMailman
    Variant vEmail
    Handle hoEmail
    Variant vTask
    Handle hoTask
    Integer iCurPctDone
    String sName
    String sValue
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    Move False To iSuccess

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

    Move False To iSuccess

    // The mailman object is used for sending and receiving email.
    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    // Set the SMTP server and any required settings.
    Set ComSmtpHost Of hoMailman To "smtp.mymailserver.com"
    Set ComSmtpUsername Of hoMailman To "myLogin"
    Set ComSmtpPassword Of hoMailman To "myPassword"
    Set ComStartTLS Of hoMailman To True

    // Create a new email object
    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End

    Set ComSubject Of hoEmail To "This is a test"
    Set ComBody Of hoEmail To "This is a test"
    Set ComFrom Of hoEmail To "Chilkat Support <support@chilkatsoft.com>"
    Get ComAddTo Of hoEmail "Chilkat Admin" "admin@chilkatsoft.com" To iSuccess

    // Call the async version of the SendEmail method to return a task object.
    // The task object is loaded, but is in the Inert state -- meaning it is
    // not yet scheduled to run on Chilkat's background thread pool.
    Get pvComObject of hoEmail to vEmail
    Get ComSendEmailAsync Of hoMailman vEmail To vTask
    If (IsComObject(vTask)) Begin
        Get Create (RefClass(cComChilkatTask)) To hoTask
        Set pvComObject Of hoTask To vTask
    End
    Get ComLastMethodSuccess Of hoMailman To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Before starting the task, tell it to keep an in-memory log of what would've been
    // ProgressInfo event callbacks.
    Set ComKeepProgressLog Of hoTask To True

    // Schedule the task for running on the thread pool.  This changes the task's state
    // from Inert to Live.
    Get ComRun Of hoTask To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoTask To sTemp1
        Showln sTemp1
        Send Destroy of hoTask
        Procedure_Return
    End

    // The application is now free to do anything else
    // while the email is being sent.

    // For this example, we'll simply sleep and periodically
    // check to see if the SendEmail if finished.  While checking
    // however, we'll report on the progress.
    Move 0 To iCurPctDone

    While ((ComFinished(hoTask)) <> True)

        Get ComPercentDone Of hoTask To iTemp1
        If (iTemp1 <> iCurPctDone) Begin
            Get ComPercentDone Of hoTask To iCurPctDone
            Showln iCurPctDone " percent done"
        End

        // Check the progress info log.
        // Emit any log entries..
        While ((ComProgressLogSize(hoTask)) > 0)
            // Get the 1st entry, emit it, and then remove it..
            Get ComProgressInfoName Of hoTask 0 To sName
            Get ComProgressInfoValue Of hoTask 0 To sValue
            Showln sName ": " sValue
            Send ComRemoveProgressInfo To hoTask 0
        Loop

        // Sleep 100 ms.
        Send ComSleepMs To hoTask 100

    Loop

    // Just in case there are any remaining entries...
    While ((ComProgressLogSize(hoTask)) > 0)
        // Get the 1st entry, emit it, and then remove it..
        Get ComProgressInfoName Of hoTask 0 To sName
        Get ComProgressInfoValue Of hoTask 0 To sValue
        Showln sName ": " sValue
        Send ComRemoveProgressInfo To hoTask 0
    Loop

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

    // If the task was "canceled", it was canceled prior to actually starting.  This could
    // happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
    // background thread pool scheduler.  

    // If the task was "aborted", it indicates that it was canceled while running in a background thread.  
    // The ResultErrorText will likely indicate that the task was aborted.

    // If the task "completed", then it ran to completion, but the actual success/failure of the method
    // is determined by the result obtained via a GetResult* method.  (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:
    Get ComStatusInt Of hoTask To iTemp1
    If (iTemp1 <> 7) Begin
        Showln "Task did not complete."
        Get ComStatus Of hoTask To sTemp1
        Showln "task status: " sTemp1
        Send Destroy of hoTask
        Procedure_Return
    End

    // The SendEmail method returns a boolean.  Therefore, after the task is finished,
    // we can get the boolean result by calling GetResultBool.  This is the return value had
    // we called SendEmail synchronously.
    Get ComGetResultBool Of hoTask To iSuccess
    If (iSuccess <> True) Begin
        // The task's ResultErrorText contains what would have been in the LastErrorText property had
        // the SendEmail method been called synchronously.
        Get ComResultErrorText Of hoTask To sTemp1
        Showln sTemp1
    End
    Else Begin
        Showln "Email sent asynchronously."
    End

    Send Destroy of hoTask

    Get ComCloseSmtpConnection Of hoMailman To iSuccess
    If (iSuccess <> True) Begin
        Showln "Connection to SMTP server not closed cleanly."

    End



End_Procedure