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Editorial Team
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Asked: 2026-05-27T05:53:41+00:00

I am using RegisterWaitForSingleObject to watch a directory for changes. I only need to

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I am using RegisterWaitForSingleObject to watch a directory for changes. I only need to be notified of the first change so I am passing WT_EXECUTEONLYONCE. Everything is fine so far.

My question is: do I still need to cancel the wait operation in this case with either UnRegisterWait or UnRegisterWaitEx or is that done automatically once the operation signals or times out?

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1 Answer

  1. Editorial Team

    Yep, you need to dispose of the handle;

    When the wait is completed, you must call the UnregisterWait or
    UnregisterWaitEx function to cancel the wait operation. (Even wait
    operations that use WT_EXECUTEONLYONCE must be canceled.)     Do not make
    a blocking call to either of these functions from within the callback
    function.

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