Question

How to capture a Cancel click during a synchronous call?

Asked by: esbjorn_larsen

I have a userform that is used to show a progress bar during a cpu-intense function that takes 5 min or more to complete.  I want the user to have the ability to "cancel" out while the function is executing.  The main function is updating the progress bar on the user forum in a loop to show %complete.  Right now the progress bar is showing fine but I cannot click on my Cancel button on the form.  It hangs until the function has completed.  Is there a way to make a async call?

Here's the flow
---------------------
( 1 )======Invoke the userform by clicking on a button on the sheet
Private Sub btnCalculateAction_Click()
    UserForm1.Show 1
End Sub
( 2 )======Userform calls the main function that is CPU intense
Private Sub UserForm_Activate()
    Call CalculateAction
End Sub
( 3 )======CalculateAction calls an update function that repaints the progress bar with %complete

Please advise!

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Asked On
2006-10-10 at 16:33:52ID22019930
Tags

cancel

,

userform

,

button

Topic

Microsoft Excel Spreadsheet Software

Participating Experts
1
Points
125
Comments
3

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Answers

 

by: zorvekPosted on 2006-10-10 at 16:44:07ID: 17703269

You need to periodically call DoEvents to give Excel an opportunity to handle clicks. Then in the user form Cancel button click handler set a module level variable indicating that cancel has been clicked. In your function monitor the variable and exit if set.

Kevin

 

by: esbjorn_larsenPosted on 2006-10-11 at 13:36:44ID: 17710508

This worked.  I did have trouble finding a way to get out of my nestsed FOR loops.  I ended up using this code:
        If DoEvents <> 1 Then
            myRowIterator = (myRowCountStop + 1)
        Else
            myRowIterator = myRowIterator + 1
        End If

As you can see, I set the iterator to a high value to get out of the loop.  I was intending to use something nicer such as a DO..WHILE with a boolean variable, but couldn't get that to work.  Does anyone have a better example?  At any rate, I DID get this to work using the DoEvents so I'll accept the answer.  Thanks!!!  Just comment on this if you have any better suggestions.

 

by: zorvekPosted on 2006-10-11 at 13:45:24ID: 17710577

There is no easy way to get out of a complex task loop. The majority of the challange is to structure the code such that you create enough opportunity for the user to cancel the process and for the code to able to gracefully exit the process without leaving anything in a weird state. How you detect when the cancel has been requested is pretty straightforward and checking the DoEvents return value is one way to do that.

Kevin

20120131-EE-VQP-002

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