const uint DIGCF_DEFAULT = 0x00000001;  // only valid with DIGCF_DEVICEINTERFACE
const uint DIGCF_PRESENT = 0x00000002;
const uint DIGCF_ALLCLASSES = 0x00000004;
const uint DIGCF_PROFILE = 0x00000008;
const uint DIGCF_DEVICEINTERFACE = 0x00000010;

       [StructLayout(LayoutKind.Sequential)]
        struct SP_DEVICE_INTERFACE_DATA
        {
            public Int32 cbSize;
            public Guid interfaceClassGuid;
            public Int32 flags;
            private UIntPtr reserved;
        };

       [StructLayout(LayoutKind.Sequential)]
        struct SP_DEVINFO_DATA
        {
            public uint cbSize;
            public Guid classGuid;
            public uint devInst;
            public IntPtr reserved;
        };

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto, Pack = 1)]
        struct SP_DEVICE_INTERFACE_DETAIL_DATA
        {
            public int cbSize;
            public char devicePath;
            //alternative
            //[MarshalAs(UnmanagedType.ByValTStr, SizeConst = BUFFER_SIZE)]
            //public string DevicePath;
        }

        [DllImport("setupapi.dll", CharSet = CharSet.Auto)]
        static extern IntPtr SetupDiGetClassDevs(
            ref Guid ClassGuid,
            [MarshalAs(UnmanagedType.LPTStr)] string Enumerator,
            IntPtr hwndParent,
            uint Flags
        );

        [DllImport(@"setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
         static extern Boolean SetupDiEnumDeviceInterfaces(
           IntPtr hDevInfo,
           //ref SP_DEVINFO_DATA devInfo,
           IntPtr devInfo,
           ref Guid interfaceClassGuid,
           UInt32 memberIndex,
           ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData
        );

        [DllImport(@"setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
         static extern Boolean SetupDiGetDeviceInterfaceDetail(
           IntPtr hDevInfo,
           ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData,
           ref SP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData,
           UInt32 deviceInterfaceDetailDataSize,
           out UInt32 requiredSize,
           ref SP_DEVINFO_DATA deviceInfoData
        );

        [DllImport("setupapi.dll", SetLastError = true)]
        public static extern bool SetupDiDestroyDeviceInfoList
        (
             IntPtr DeviceInfoSet
        );

        [DllImport("setupapi.dll", SetLastError = true)]
        static extern bool SetupDiEnumDeviceInfo(
            IntPtr DeviceInfoSet,
            uint MemberIndex,
            ref SP_DEVINFO_DATA DeviceInfoData
         );


public IntPtr GetBleHandle(string guid)
        {
            SP_DEVICE_INTERFACE_DATA did = new SP_DEVICE_INTERFACE_DATA(); 
            SP_DEVINFO_DATA dd = new SP_DEVINFO_DATA();
            //SP_DEVINFO_DATA dev_info = new SP_DEVINFO_DATA();
            IntPtr hComm = IntPtr.Zero;

            Guid bluetooth_interface_guid = new Guid(guid);
            IntPtr hdi = SetupDiGetClassDevs(ref bluetooth_interface_guid, null, IntPtr.Zero, DIGCF_ALLCLASSES | DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);

            if (hdi == INVALID_HANDLE_VALUE) return IntPtr.Zero;

            bool success = true;
            uint i = 0;

            while (success)
            {
                // create a Device Interface Data structure
                did.cbSize = Marshal.SizeOf(did);

                //dd.cbSize = (uint)Marshal.SizeOf(dd);
                //success = SetupDiEnumDeviceInfo(hdi, i, ref dd);  //here success = true

                // start the enumeration 
                success = SetupDiEnumDeviceInterfaces(hdi, IntPtr.Zero, ref bluetooth_interface_guid, 0, ref did);

                if (success)
                {
                    //some code
                                
                    i++;
                }
            }

            SetupDiDestroyDeviceInfoList(hdi);

            return hComm;
        }

int error = Marshal.GetLastWin32Error();