C#枚举硬件设备（升级版）

先取设备类型： 
    /// <summary>
    /// 设备类型
    /// </summary>
 class DeviceClasses
    {
        public static Guid ClassesGuid;
        public const int MAX_SIZE_DEVICE_DESCRIPTION = 1000;
        public const int CR_SUCCESS = 0x00000000;
        public const int CR_NO_SUCH_VALUE = 0x00000025;
        public const int CR_INVALID_DATA = 0x0000001F;
        private const int DIGCF_PRESENT = 0x00000002;
        private const int DIOCR_INSTALLER = 0x00000001;
        private const int MAXIMUM_ALLOWED = 0x02000000;
        public const int DMI_MASK = 0x00000001;
        public const int DMI_BKCOLOR = 0x00000002;
        public const int DMI_USERECT = 0x00000004;

        [StructLayout(LayoutKind.Sequential)]
        class SP_DEVINFO_DATA
        {
            public int cbSize;
            public Guid ClassGuid;
            public int DevInst;
            public ulong Reserved;
        }

        [DllImport("cfgmgr32.dll")]
        private static extern UInt32 CM_Enumerate_Classes(UInt32 ClassIndex, ref Guid ClassGuid, UInt32 Params);

        [DllImport("setupapi.dll")]
        private static extern Boolean SetupDiClassNameFromGuidA(ref Guid ClassGuid, StringBuilder ClassName, UInt32 ClassNameSize, ref UInt32 RequiredSize);

        [DllImport("setupapi.dll")]
        private static extern IntPtr SetupDiGetClassDevsA(ref Guid ClassGuid, UInt32 Enumerator, IntPtr hwndParent, UInt32 Flags);

        [DllImport("setupapi.dll")]
        private static extern Boolean SetupDiDestroyDeviceInfoList(IntPtr DeviceInfoSet);

        [DllImport("setupapi.dll")]
        private static extern IntPtr SetupDiOpenClassRegKeyExA(ref Guid ClassGuid, UInt32 samDesired, int Flags, IntPtr MachineName, UInt32 Reserved);

        [DllImport("setupapi.dll")]
        private static extern Boolean SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, UInt32 MemberIndex, SP_DEVINFO_DATA DeviceInfoData);

        [DllImport("advapi32.dll")]
        private static extern UInt32 RegQueryValueA(IntPtr KeyClass, UInt32 SubKey, StringBuilder ClassDescription, ref UInt32 sizeB);

        /// <summary>
        /// 设备类型图标信息
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public class SP_CLASSIMAGELIST_DATA
        {
            public int cbSize;
            public ImageList ImageList;
            public ulong Reserved;
        }
        public struct RECT
        {
            long left;
            long top;
            long right;
            long bottom;
        }

        /// <summary>
        /// 载入图片
        /// </summary>
        /// <param name="hInstance"></param>
        /// <param name="Reserved"></param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        public static extern int LoadBitmapW(int hInstance, ulong Reserved);

        /// <summary>
        /// 获取图标
        /// </summary>
        /// <param name="ClassImageListData"></param>
        /// <returns></returns>
        [DllImport("setupapi.dll")]
        public static extern Boolean SetupDiGetClassImageList(out SP_CLASSIMAGELIST_DATA ClassImageListData);
        [DllImport("setupapi.dll")]
        public static extern int SetupDiDrawMiniIcon(Graphics hdc, RECT rc, int MiniIconIndex, int Flags);
        [DllImport("setupapi.dll")]
        public static extern bool SetupDiGetClassBitmapIndex(Guid ClassGuid, out int MiniIconIndex);
        [DllImport("setupapi.dll")]
        public static extern int SetupDiLoadClassIcon(ref Guid classGuid, out IntPtr hIcon, out int index);

        /// <summary>
        /// 枚举设备类型
        /// </summary>
        /// <param name="ClassIndex"></param>
        /// <param name="ClassName"></param>
        /// <param name="ClassDescription"></param>
        /// <param name="DevicePresent"></param>
        /// <returns></returns>
 public static int EnumerateClasses(UInt32 ClassIndex, StringBuilder ClassName, StringBuilder ClassDescription, ref bool DevicePresent)
        {
            Guid ClassGuid = Guid.Empty;
            IntPtr NewDeviceInfoSet;
            UInt32 result;
            SP_DEVINFO_DATA DeviceInfoData = new SP_DEVINFO_DATA();
            bool resNam = false;
            UInt32 RequiredSize = 0;
            result = CM_Enumerate_Classes(ClassIndex, ref ClassGuid, 0);
            DevicePresent = false;
            SP_CLASSIMAGELIST_DATA imagelist = new SP_CLASSIMAGELIST_DATA();
            if (result != CR_SUCCESS)
            {
                return (int)result;
            }
            resNam = SetupDiClassNameFromGuidA(ref ClassGuid, ClassName, RequiredSize, ref RequiredSize);
            if (RequiredSize > 0)
            {
                ClassName.Capacity = (int)RequiredSize;
                resNam = SetupDiClassNameFromGuidA(ref ClassGuid, ClassName, RequiredSize, ref RequiredSize);
            }
            NewDeviceInfoSet = SetupDiGetClassDevsA(ref ClassGuid, 0, IntPtr.Zero, DIGCF_PRESENT);
            if (NewDeviceInfoSet.ToInt32() == -1)
            {
                DevicePresent = false;
                return 0;
            }

            UInt32 numD = 0;
            DeviceInfoData.cbSize = 28;
            DeviceInfoData.DevInst = 0;
            DeviceInfoData.ClassGuid = System.Guid.Empty;
            DeviceInfoData.Reserved = 0;

            Boolean res1 = SetupDiEnumDeviceInfo(
            NewDeviceInfoSet,
            numD,
            DeviceInfoData);

            if (!res1)
            {
                DevicePresent = false;
                return 0;
            }
            SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);
            IntPtr KeyClass = SetupDiOpenClassRegKeyExA(
                ref ClassGuid, MAXIMUM_ALLOWED, DIOCR_INSTALLER, IntPtr.Zero, 0);
            if (KeyClass.ToInt32() == -1)
            {
                DevicePresent = false;
                return 0;
            }
            UInt32 sizeB = MAX_SIZE_DEVICE_DESCRIPTION;
            ClassDescription.Capacity = MAX_SIZE_DEVICE_DESCRIPTION;
            UInt32 res = RegQueryValueA(KeyClass, 0, ClassDescription, ref sizeB);
            if (res != 0) ClassDescription = new StringBuilder(""); //No device description
            DevicePresent = true;
            ClassesGuid = DeviceInfoData.ClassGuid;
            return 0;
        }
    }

再取设备信息：

 class DeviceInfo
    {
        private const int DIGCF_PRESENT = (0x00000002);
        private const int MAX_DEV_LEN = 1000;
        private const int SPDRP_FRIENDLYNAME = (0x0000000C);
        private const int SPDRP_DEVICEDESC = (0x00000000);

        [StructLayout(LayoutKind.Sequential)]
        private class SP_DEVINFO_DATA
        {
            public int cbSize;
            public Guid ClassGuid;
            public int DevInst;
            public ulong Reserved;
        };
        [DllImport("setupapi.dll")]
        private static extern Boolean SetupDiClassGuidsFromNameA(string ClassN, ref Guid guids, UInt32 ClassNameSize, ref UInt32 ReqSize);

        [DllImport("setupapi.dll")]
        private static extern IntPtr SetupDiGetClassDevsA(ref Guid ClassGuid, UInt32 Enumerator, IntPtr hwndParent, UInt32 Flags);

        [DllImport("setupapi.dll")]
        private static extern Boolean SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, UInt32 MemberIndex, SP_DEVINFO_DATA DeviceInfoData);

        [DllImport("setupapi.dll")]
        private static extern Boolean SetupDiDestroyDeviceInfoList(IntPtr DeviceInfoSet);

        [DllImport("setupapi.dll")]
        private static extern Boolean SetupDiGetDeviceRegistryPropertyA(IntPtr DeviceInfoSet, SP_DEVINFO_DATA DeviceInfoData, UInt32 Property, UInt32 PropertyRegDataType, StringBuilder PropertyBuffer, UInt32 PropertyBufferSize, IntPtr RequiredSize);

        /// <summary>
        /// 通过设备类型枚举设备信息
        /// </summary>
        /// <param name="DeviceIndex"></param>
        /// <param name="ClassName"></param>
        /// <param name="DeviceName"></param>
        /// <returns></returns>
 public static int EnumerateDevices(UInt32 DeviceIndex, string ClassName, StringBuilder DeviceName)
        {
            UInt32 RequiredSize = 0;
            Guid guid = Guid.Empty;
            Guid[] guids = new Guid[1];
            IntPtr NewDeviceInfoSet;
            SP_DEVINFO_DATA DeviceInfoData = new SP_DEVINFO_DATA();


            bool res = SetupDiClassGuidsFromNameA(ClassName, ref guids[0], RequiredSize, ref RequiredSize);
            if (RequiredSize == 0)
            {
                //类型不正确
                DeviceName = new StringBuilder("");
                return -2;
            }

            if (!res)
            {
                guids = new Guid[RequiredSize];
                res = SetupDiClassGuidsFromNameA(ClassName, ref guids[0], RequiredSize, ref RequiredSize);

                if (!res || RequiredSize == 0)
                {
                    //类型不正确
                    DeviceName = new StringBuilder("");
                    return -2;
                }
            }

            //通过类型获取设备信息
            NewDeviceInfoSet = SetupDiGetClassDevsA(ref guids[0], 0, IntPtr.Zero, DIGCF_PRESENT);
            if (NewDeviceInfoSet.ToInt32() == -1)
            {
                //设备不可用
                DeviceName = new StringBuilder("");
                return -3;
            }

            DeviceInfoData.cbSize = 28;
            //正常状态
            DeviceInfoData.DevInst = 0;
            DeviceInfoData.ClassGuid = System.Guid.Empty;
            DeviceInfoData.Reserved = 0;

            res = SetupDiEnumDeviceInfo(NewDeviceInfoSet,
                   DeviceIndex, DeviceInfoData);
            if (!res)
            {
                //没有设备
                SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);
                DeviceName = new StringBuilder("");
                return -1;
            }



            DeviceName.Capacity = MAX_DEV_LEN;
            if (!SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet, DeviceInfoData,
            SPDRP_FRIENDLYNAME, 0, DeviceName, MAX_DEV_LEN, IntPtr.Zero))
            {
                res = SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet,
                 DeviceInfoData, SPDRP_DEVICEDESC, 0, DeviceName, MAX_DEV_LEN, IntPtr.Zero);
                if (!res)
                {
                    //类型不正确
                    SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);
                    DeviceName = new StringBuilder("");
                    return -4;
                }
            }
            return 0;
        }
    }