Weird millisecond offset

SetTimer(2, 600000, NULL);

should set a timer to go off in 10 minutes.

I get a very strange millisecond offset - the timer activates about 30 seconds early.

What is wrong?
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SetTimer isn't perfect.  It is event driven and ends up getting fired when the system can post a message for it (its usually close to the time delay you specify, but not exactly).  You might try using a "Waitable Timer Object" using CreateWaitableTimer (requires a thread) or you could try creating a thread and using WaitForSingleLock to sit on an event until the time period has expired.  These options are usually more accurate than the SetTimer approach.

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System Programming

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