c# winform 怎么把设备注册到窗口

我需要检测hid设备插拔信息，

  [DllImport("user32.dll", SetLastError = true)]

        static extern IntPtr RegisterDeviceNotification(IntPtr hRecipient, IntPtr NotificationFilter, uint Flags);



        [StructLayout(LayoutKind.Explicit)]

        private struct DevBroadcastDeviceInterfaceBuffer

        {

            public DevBroadcastDeviceInterfaceBuffer(Int32 deviceType)

            {

                dbch_size = Marshal.SizeOf(typeof(DevBroadcastDeviceInterfaceBuffer));

                dbch_devicetype = deviceType;

                dbch_reserved = 0;

            }



            [FieldOffset(0)]

            public Int32 dbch_size;

            [FieldOffset(4)]

            public Int32 dbch_devicetype;

            [FieldOffset(8)]

            public Int32 dbch_reserved;

        }

          //注册设备变化消息到指定窗口

        //返回值：成功，对应的句柄。失败，0

        static public IntPtr RegiseterUsbHidDeviceNotificationToWindow(IntPtr hWndToRecieveNotification)

        {

            IntPtr mem = IntPtr.Zero;

            mem = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(DevBroadcastDeviceInterfaceBuffer)));

            Marshal.StructureToPtr(new DevBroadcastDeviceInterfaceBuffer(5), mem, false);

            return RegisterDeviceNotification(hWndToRecieveNotification, mem, DEVICE_NOTIFY_WINDOW_HANDLE);

        }

注册后检测不到信息，这里面的注册是少了什么东西呢，谢谢！ --------------------编程问答-------------------- 有知道的吗。

补充：.NET技术 ,  C#