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multi tasking???

Posted on 1998-08-26
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Last Modified: 2010-04-30
I have a program that has a huge for/next loop. I takes between 10 to 20 seconds to complete. I want to put a cancel button in my program to get out of the loop. But When the loop is going there is no way to click any buttons. What can I do? Thanks
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Question by:xer_soft
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mcix earned 800 total points
ID: 1431180
Although Timer events are the best tool for background processing, particularly for very long tasks, the DoEvents function provides a convenient way to allow a task to be canceled. For example, the following code shows a "Process" button that changes to a "Cancel" button when it is clicked. Clicking it again interrupts the task it is performing.

' The original caption for this button is "Process".
Private Sub Command1_Click()
   ' Static variables are shared by all instances
   ' of a procedure.
   Static blnProcessing As Boolean
   Dim lngCt As Long
   Dim intYieldCt As Integer
   Dim dblDummy As Double
   ' When the button is clicked, test whether it's
    'already processing.
   If blnProcessing Then
      ' If processing is in progress, cancel it.
      blnProcessing = False
   Else
      Command1.Caption = "Cancel"
      blnProcessing = True
      lngCt = 0
      ' Perform a million floating-point
      ' multiplications. After every
      ' thousand, check for cancellation.
      Do While blnProcessing And (lngCt < 1000000)
         For intYieldCt = 1 To 1000
            lngCt = lngCt + 1
            dblDummy = lngCt * 3.14159
         Next intYieldCt
         ' The DoEvents statement allows other
         ' events to occur, including pressing this
         ' button a second time.
         DoEvents
      Loop
      blnProcessing = False
      Command1.Caption = "Process"
      MsgBox lngCt & " multiplications were performed"
   End If
End Sub


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Author Comment

by:xer_soft
ID: 1431181
Thanks a bunch!
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Expert Comment

by:mcix
ID: 1431182
Not a problem...
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