'------------------
'Creator: aeonhack
'Site: elitevs.net
'Created: 11/30/2011
'Changed: 11/30/2011
'Version: 1.0.0
'------------------
Class PrecisionTimer
    Implements IDisposable
 
    Private _Enabled As Boolean
    ReadOnly Property Enabled() As Boolean
        Get
            Return _Enabled
        End Get
    End Property
 
    Private Handle As IntPtr
    Private TimerCallback As TimerDelegate
 
    <DllImport("kernel32.dll", EntryPoint:="CreateTimerQueueTimer")> _
    Private Shared Function CreateTimerQueueTimer( _
    ByRef handle As IntPtr, _
    ByVal queue As IntPtr, _
    ByVal callback As TimerDelegate, _
    ByVal state As IntPtr, _
    ByVal dueTime As UInteger, _
    ByVal period As UInteger, _
    ByVal flags As UInteger) As Boolean
    End Function
 
    <DllImport("kernel32.dll", EntryPoint:="DeleteTimerQueueTimer")> _
    Private Shared Function DeleteTimerQueueTimer( _
    ByVal queue As IntPtr, _
    ByVal handle As IntPtr, _
    ByVal callback As IntPtr) As Boolean
    End Function
 
    Delegate Sub TimerDelegate(ByVal reserve As IntPtr, ByVal reserve As Boolean)
 
    Sub Create(ByVal dueTime As UInteger, ByVal period As UInteger, ByVal callback As TimerDelegate)
        If _Enabled Then Return
 
        TimerCallback = callback
        Dim Success As Boolean = CreateTimerQueueTimer(Handle, IntPtr.Zero, TimerCallback, IntPtr.Zero, dueTime, period, 0)
 
        If Not Success Then ThrowNewException("CreateTimerQueueTimer")
        _Enabled = Success
    End Sub
 
    Sub Delete()
        If Not _Enabled Then Return
        Dim Success As Boolean = DeleteTimerQueueTimer(IntPtr.Zero, Handle, IntPtr.Zero)
 
        If Not Success AndAlso Not Marshal.GetLastWin32Error = 997 Then
            ThrowNewException("DeleteTimerQueueTimer")
        End If
 
        _Enabled = Not Success
    End Sub
 
    Private Sub ThrowNewException(ByVal name As String)
        Throw New Exception(String.Format("{0} failed. Win32Error: {1}", name, Marshal.GetLastWin32Error))
    End Sub
 
    Private Sub Dispose() Implements IDisposable.Dispose
        Delete()
    End Sub
End Class