HWInfoRegistry.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using Microsoft.Win32;

namespace FanControl.HWInfo
{
    internal class HWInfoRegistry : IDisposable
    {
        private static CultureInfo _format = new CultureInfo("en-us");

        const string SENSOR_REGISTRY_NAME = "Sensor";
        const string LABEL_REGISTRY_NAME = "Label";
        const string VALUE_REGISTRY_NAME = "Value";
        const string VALUE_RAW_REGISTRY_NAME = "ValueRaw";
        const string MAIN_KEY = @"SOFTWARE\HWiNFO64\VSB";

        private RegistryKey _key;
        private int _count;

        public HWInfoRegistry()
        {
            _key = Registry.CurrentUser.OpenSubKey(MAIN_KEY);
            _count = _key?.ValueCount ?? 0;
        }

        public bool IsActive()
        {
            try
            {
                return _key?.ValueCount > 0;
            }
            catch (Exception exception)
            {
                return false;
            }
        }

        public HWInfoPluginSensor[] GetSensors()
        {
            if (_key == null)
            {
                return Array.Empty<HWInfoPluginSensor>();
            }

            var names = _key.GetValueNames();

            var sensors = names.Where(x => x.StartsWith(SENSOR_REGISTRY_NAME, StringComparison.InvariantCultureIgnoreCase));

            var list = new List<HWInfoPluginSensor>();

            foreach (var sensor in sensors)
            {
                if (int.TryParse(sensor.Replace(SENSOR_REGISTRY_NAME, string.Empty), out int index))
                {
                    var type = GetSensorType(_key, index);
                    var id = GetId(_key, index);
                    var name = GetName(_key, index);

                    var hwInfoSensor = new HWInfoPluginSensor(index, type, id, name);

                    if (list.Any(x => x.Id == id))
                    {
                        // duplicate
                        continue;
                    }

                    list.Add(hwInfoSensor);
                }
            }

            return list.ToArray();
        }

        internal HWInfoRegistryUpdateResult UpdateValues(HWInfoPluginSensor[] sensors)
        {
            if (_key.ValueCount != _count)
            {
                _count = _key.ValueCount;
                var newSensors = GetSensors().ToDictionary(x => x.Id, x => x);

                foreach (var sensor in sensors)
                {
                    if (newSensors.TryGetValue(sensor.Id, out var corresponding))
                    {
                        sensor.Index = corresponding.Index;
                    }
                    else
                    {
                        sensor.Invalidate();
                    }
                }
            }

            var failed = new List<FailedSensor>();

            foreach (var sensor in sensors)
            {
                if (!sensor.IsValid)
                {
                    failed.Add(new FailedSensor { Id = sensor.Id });
                    continue;
                }

                object valueRaw = _key.GetValue(VALUE_RAW_REGISTRY_NAME + sensor.Index);

                if (valueRaw is string str && !string.IsNullOrEmpty(str) && float.TryParse(str, NumberStyles.Float, _format, out float res))
                    sensor.Value = res;
                else
                    failed.Add(new FailedSensor { Id = sensor.Id, ValueRaw = valueRaw });
            }

            return failed.Any() ?
                HWInfoRegistryUpdateResult.Failure(failed) :
                HWInfoRegistryUpdateResult.Success();
        }

        public void Dispose()
        {
            _key?.Dispose();
            _key = null;
        }

        private static HwInfoSensorType GetSensorType(RegistryKey key, int index)
        {
            var value = (string)key.GetValue(VALUE_REGISTRY_NAME + index);
            var unit = value.Trim().Split(' ').Skip(1).FirstOrDefault() ?? string.Empty;

            switch (unit.ToUpperInvariant())
            {
                case "°C":
                case "℃":
                case "°F":  // maybe should not support F since no conversion is available
                case "℉":
                    return HwInfoSensorType.Temperature;
                case "RPM":
                    return HwInfoSensorType.RPM;
                default:
                    return HwInfoSensorType.NotSupported;
            }
        }

        private static string GetName(RegistryKey subKey, int index)
        {
            var sensor = subKey.GetValue(SENSOR_REGISTRY_NAME + index);
            var label = subKey.GetValue(LABEL_REGISTRY_NAME + index);

            return $"{label} - {sensor}";
        }

        private static string GetId(RegistryKey subKey, int index)
        {
            var sensor = subKey.GetValue(SENSOR_REGISTRY_NAME + index);
            var label = subKey.GetValue(LABEL_REGISTRY_NAME + index);
            var unit = (subKey.GetValue(VALUE_REGISTRY_NAME + index)
                .ToString()
                .Trim()
                .Split(' ')
                .Skip(1)
                .FirstOrDefault() ?? string.Empty).ToUpperInvariant();

            return $"HWInfo/{sensor}/{label}/{unit}";
        }
    }
}