public delegate void waveInProc(

    // values for waveInProc.uMsg

delegate void waveInProc(IntPtr hwi, WIMMessages uMsg, IntPtr dwInstance, IntPtr dwParam1, IntPtr dwParam2);

Delegate Sub waveInProc(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer, ByVal uMsg As WIMMessages, ByVal dwInstance As UIntPtr, ByVal dwParam1 As UIntPtr, ByVal dwParam2 As UIntPtr)