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Public Class Form1
Dim mHandler As TimerEventHandler
Dim iCount As Long = 0
Dim mTimerId As Integer
<DllImport("winmm.dll")>
Private Shared Function timeSetEvent(delay As Integer, resolution As Integer, handler As TimerEventHandler, user As IntPtr, eventType As Integer) As Integer
End Function
<DllImport("winmm.dll")>
Private Shared Function timeBeginPeriod(millisecond As Integer) As Integer
End Function
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
timeBeginPeriod(1)
mHandler = New TimerEventHandler(AddressOf TimerCallback)
mTimerId = timeSetEvent(1, 0, mHandler, IntPtr.Zero, 1)
End Sub
Private Delegate Sub TimerEventHandler(id As Integer, msg As Integer, user As IntPtr, dw1 As Integer, dw2 As Integer)
Private Sub TimerCallback(id As Integer, msg As Integer, user As IntPtr, dw1 As Integer, dw2 As Integer)
iCount += 1
End Sub
End Class