static extern IntPtr BluetoothFindFirstDevice(ref BLUETOOTH_DEVICE_SEARCH_PARAMS searchParams, ref BLUETOOTH_DEVICE_INFO deviceInfo);

BLUETOOTH_DEVICE_SEARCH_PARAMS

    private struct BLUETOOTH_DEVICE_SEARCH_PARAMS

        this.dwSize = (uint)Marshal.SizeOf(typeof(BLUETOOTH_DEVICE_SEARCH_PARAMS));

Structure BLUETOOTH_DEVICE_SEARCH_PARAMS