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Stopping app in recursive loop?

Posted on 1998-01-30
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Last Modified: 2010-04-04
Can someone tell me how to stop an application when a recursive loop is running? For example, if I am recursively reading through an entire disk (which takes a long time), and I click the "Close" button, nothing happens.  I want to be able to stop everything and just shut down. I thought I had this figured out, but to no avail. :-)  
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Question by:jexd99
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d003303 earned 50 total points
ID: 1358031
Yo,

define a global break-flag that is false initially. Set it to true in the OnCloseQuery-event of the form.
In your recursive loop, add the line Application.ProcessMessages and check for the break-flag. Exit the loop if the flag is true.

Slash/d003303
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by:Matvey
ID: 1358032
You can do it with threads. -Look at the sorting example taht D3 or D2 has in the \demos\threads dir.
If you want to terminate a thread you just call the .Terminate method and that means taht your recursive proc will also terminate.

Good luck!
Matvey
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Expert Comment

by:michael2010898
ID: 1358033
If the program responds to the button click you
can use application.terminate
If not then use thread for the procedure and when the user
clicks the button use .Terminate if you want to stop
the procedure or use .Supend to supend it and then you will be
able to continue it with .Resume.


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by:d003303
ID: 1358034
Threads might be a better solution than mine. You could also recurse through several disks the same time, just start a second instance of the thread object. Like Matvey said, the sorting example is worth a look.
If want to use threads, don't hesitate to reject my answer.

Slash/d003303
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by:jexd99
ID: 1358035
Thanks for the info. :)
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