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Stopping Processing...

Posted on 1998-10-05
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Last Modified: 2010-04-06
Hi..
  I wish to have a 'Stop' or 'cancel' button in my application such that when clicked by the user in the middle of a processing job, the app will cease processing and return to the ready state. How can I do this?

Cheers
   Shawn Halfpenny
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Question by:aztec
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Expert Comment

by:viktornet
ID: 1341820
And what state is that??? Give some sample codes or something similar...

Regards,
Viktor Ivanov
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Accepted Solution

by:
gdebiasa earned 200 total points
ID: 1341821
You'll have to put Application.ProcessMessages throughout the process you want to have interrupted. Then, you'll be able to receive an event (like the button click), and set a boolean (StopNow := true, for example).

Then, (I presume you're looping over something, or a similar operation), at the top of the loop, check StopNow and exit the loop/procedure (using break or exit).

The major problem with this is that Application.ProcessMessages will greatly slow down whatever process you're performing (I wouldn't use it more than once per loop, but you might need more, depending on exactly what's happening in your process).

Hope this helps,
Glen
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Author Comment

by:aztec
ID: 1341822
Thanks Glen!

Shawn
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