Температура видеокарты NVIDIA

 private class NativeMethod
        {
            [DllImport("nvcpl.dll", EntryPoint = "NvCplGetThermalSettings", CallingConvention = CallingConvention.Cdecl)]
            public static extern bool NvCplGetThermalSettings(UInt32 nWindowsMonitorNumber, out UInt32 pdwCoreTemp, out UInt32 pdwAmbientTemp, out UInt32 pdwUpperLimit);
        }
 
        public UInt32 GetNVidiaCardTemperature(uint monitorNumber)
        {
            UInt32 coreTemp = 0;
            UInt32 ambientTemp = 0;
            UInt32 upperLimit = 0;
            NativeMethod.NvCplGetThermalSettings(0, out coreTemp, out ambientTemp, out upperLimit);
            return coreTemp;
        }

/*
  
  Version: MPL 1.1/GPL 2.0/LGPL 2.1
 
  The contents of this file are subject to the Mozilla Public License Version
  1.1 (the "License"); you may not use this file except in compliance with
  the License. You may obtain a copy of the License at
 
  [url]http://www.mozilla.org/MPL/[/url]
 
  Software distributed under the License is distributed on an "AS IS" basis,
  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  for the specific language governing rights and limitations under the License.
 
  The Original Code is the Open Hardware Monitor code.
 
  The Initial Developer of the Original Code is 
  Michael Möller <m.moeller@gmx.ch>.
  Portions created by the Initial Developer are Copyright (C) 2009-2010
  the Initial Developer. All Rights Reserved.
 
  Contributor(s):
 
  Alternatively, the contents of this file may be used under the terms of
  either the GNU General Public License Version 2 or later (the "GPL"), or
  the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  in which case the provisions of the GPL or the LGPL are applicable instead
  of those above. If you wish to allow use of your version of this file only
  under the terms of either the GPL or the LGPL, and not to allow others to
  use your version of this file under the terms of the MPL, indicate your
  decision by deleting the provisions above and replace them with the notice
  and other provisions required by the GPL or the LGPL. If you do not delete
  the provisions above, a recipient may use your version of this file under
  the terms of any one of the MPL, the GPL or the LGPL.
 
*/
 
using System;
using System.Runtime.InteropServices;
using System.Text;
 
namespace Nvidia {
 
  public enum NvStatus {
    OK = 0,
    ERROR = -1,
    LIBRARY_NOT_FOUND = -2,
    NO_IMPLEMENTATION = -3,
    API_NOT_INTIALIZED = -4,
    INVALID_ARGUMENT = -5,
    NVIDIA_DEVICE_NOT_FOUND = -6,
    END_ENUMERATION = -7,
    INVALID_HANDLE = -8,
    INCOMPATIBLE_STRUCT_VERSION = -9,
    HANDLE_INVALIDATED = -10,
    OPENGL_CONTEXT_NOT_CURRENT = -11,
    NO_GL_EXPERT = -12,
    INSTRUMENTATION_DISABLED = -13,
    EXPECTED_LOGICAL_GPU_HANDLE = -100,
    EXPECTED_PHYSICAL_GPU_HANDLE = -101,
    EXPECTED_DISPLAY_HANDLE = -102,
    INVALID_COMBINATION = -103,
    NOT_SUPPORTED = -104,
    PORTID_NOT_FOUND = -105,
    EXPECTED_UNATTACHED_DISPLAY_HANDLE = -106,
    INVALID_PERF_LEVEL = -107,
    DEVICE_BUSY = -108,
    NV_PERSIST_FILE_NOT_FOUND = -109,
    PERSIST_DATA_NOT_FOUND = -110,
    EXPECTED_TV_DISPLAY = -111,
    EXPECTED_TV_DISPLAY_ON_DCONNECTOR = -112,
    NO_ACTIVE_SLI_TOPOLOGY = -113,
    SLI_RENDERING_MODE_NOTALLOWED = -114,
    EXPECTED_DIGITAL_FLAT_PANEL = -115,
    ARGUMENT_EXCEED_MAX_SIZE = -116,
    DEVICE_SWITCHING_NOT_ALLOWED = -117,
    TESTING_CLOCKS_NOT_SUPPORTED = -118,
    UNKNOWN_UNDERSCAN_CONFIG = -119,
    TIMEOUT_RECONFIGURING_GPU_TOPO = -120,
    DATA_NOT_FOUND = -121,
    EXPECTED_ANALOG_DISPLAY = -122,
    NO_VIDLINK = -123,
    REQUIRES_REBOOT = -124,
    INVALID_HYBRID_MODE = -125,
    MIXED_TARGET_TYPES = -126,
    SYSWOW64_NOT_SUPPORTED = -127,
    IMPLICIT_SET_GPU_TOPOLOGY_CHANGE_NOT_ALLOWED = -128,
    REQUEST_USER_TO_CLOSE_NON_MIGRATABLE_APPS = -129,
    OUT_OF_MEMORY = -130,
    WAS_STILL_DRAWING = -131,
    FILE_NOT_FOUND = -132,
    TOO_MANY_UNIQUE_STATE_OBJECTS = -133,
    INVALID_CALL = -134,
    D3D10_1_LIBRARY_NOT_FOUND = -135,
    FUNCTION_NOT_FOUND = -136
  }
 
  public enum NvThermalController {
    NONE = 0,
    GPU_INTERNAL,  
    ADM1032,
    MAX6649,       
    MAX1617,      
    LM99,      
    LM89,         
    LM64,         
    ADT7473,
    SBMAX6649,
    VBIOSEVT,  
    OS,    
    UNKNOWN = -1,
  }
 
  public enum NvThermalTarget {
    NONE = 0,
    GPU = 1,
    MEMORY = 2,
    POWER_SUPPLY = 4,
    BOARD = 8,
    ALL = 15,
    UNKNOWN = -1
  };
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvSensor {
    public NvThermalController Controller;
    public uint DefaultMinTemp;
    public uint DefaultMaxTemp;
    public uint CurrentTemp;
    public NvThermalTarget Target;     
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvGPUThermalSettings {
    public uint Version;
    public uint Count;
    [MarshalAs(UnmanagedType.ByValArray, 
      SizeConst = NVAPI.MAX_THERMAL_SENSORS_PER_GPU)]
    public NvSensor[] Sensor;
  }
 
  [StructLayout(LayoutKind.Sequential)]
  public struct NvDisplayHandle {
    private readonly IntPtr ptr;
  }
 
  [StructLayout(LayoutKind.Sequential)]
  public struct NvPhysicalGpuHandle {
    private readonly IntPtr ptr;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvClocks {
    public uint Version;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_CLOCKS_PER_GPU)]
    public uint[] Clock;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvPState {
    public bool Present;
    public int Percentage;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvPStates {
    public uint Version;
    public uint Flags;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_PSTATES_PER_GPU)]
    public NvPState[] PStates;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvUsages {
    public uint Version;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_USAGES_PER_GPU)]
    public uint[] Usage;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvCooler {
    public int Type;
    public int Controller;
    public int DefaultMin;
    public int DefaultMax;
    public int CurrentMin;
    public int CurrentMax;
    public int CurrentLevel;
    public int DefaultPolicy;
    public int CurrentPolicy;
    public int Target;
    public int ControlType;
    public int Active;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvGPUCoolerSettings {
    public uint Version;
    public uint Count;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_COOLER_PER_GPU)]
    public NvCooler[] Cooler;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvMemoryInfo {
    public uint Version;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 
      NVAPI.MAX_MEMORY_VALUES_PER_GPU)]
    public uint[] Values;
  }
 
  [StructLayout(LayoutKind.Sequential, Pack = 8)]
  public struct NvDisplayDriverVersion {
    public uint Version;
    public uint DriverVersion;
    public uint BldChangeListNum;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = NVAPI.SHORT_STRING_MAX)]
    public string BuildBranch;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = NVAPI.SHORT_STRING_MAX)]
    public string Adapter;
  }
 
  public class NVAPI {
 
    public const int MAX_PHYSICAL_GPUS = 64;
    public const int SHORT_STRING_MAX = 64;
 
    public const int MAX_THERMAL_SENSORS_PER_GPU = 3;    
    public const int MAX_CLOCKS_PER_GPU = 0x120;
    public const int MAX_PSTATES_PER_GPU = 8;
    public const int MAX_USAGES_PER_GPU = 33;
    public const int MAX_COOLER_PER_GPU = 20;
    public const int MAX_MEMORY_VALUES_PER_GPU = 5;
 
    public static readonly uint GPU_THERMAL_SETTINGS_VER = (uint)
      Marshal.SizeOf(typeof(NvGPUThermalSettings)) | 0x10000;
    public static readonly uint GPU_CLOCKS_VER = (uint)
      Marshal.SizeOf(typeof(NvClocks)) | 0x20000;
    public static readonly uint GPU_PSTATES_VER = (uint)
      Marshal.SizeOf(typeof(NvPStates)) | 0x10000;
    public static readonly uint GPU_USAGES_VER = (uint)
      Marshal.SizeOf(typeof(NvUsages)) | 0x10000;
    public static readonly uint GPU_COOLER_SETTINGS_VER = (uint)
      Marshal.SizeOf(typeof(NvGPUCoolerSettings)) | 0x20000;
    public static readonly uint GPU_MEMORY_INFO_VER = (uint) 
      Marshal.SizeOf(typeof(NvMemoryInfo)) | 0x20000;
    public static readonly uint DISPLAY_DRIVER_VERSION_VER = (uint)
      Marshal.SizeOf(typeof(NvDisplayDriverVersion)) | 0x10000;
      
    private delegate NvStatus NvAPI_InitializeDelegate();
    private delegate NvStatus NvAPI_GPU_GetFullNameDelegate(
      NvPhysicalGpuHandle gpuHandle, StringBuilder name);
 
    public delegate NvStatus NvAPI_GPU_GetThermalSettingsDelegate(
      NvPhysicalGpuHandle gpuHandle, int sensorIndex, 
      ref NvGPUThermalSettings nvGPUThermalSettings);
    public delegate NvStatus NvAPI_EnumNvidiaDisplayHandleDelegate(int thisEnum,
      ref NvDisplayHandle displayHandle);
    public delegate NvStatus NvAPI_GetPhysicalGPUsFromDisplayDelegate(
      NvDisplayHandle displayHandle, [Out] NvPhysicalGpuHandle[] gpuHandles, 
      out uint gpuCount);
    public delegate NvStatus NvAPI_EnumPhysicalGPUsDelegate(
      [Out] NvPhysicalGpuHandle[] gpuHandles, out int gpuCount);
    public delegate NvStatus NvAPI_GPU_GetTachReadingDelegate(
      NvPhysicalGpuHandle gpuHandle, out int value);
    public delegate NvStatus NvAPI_GPU_GetAllClocksDelegate(
      NvPhysicalGpuHandle gpuHandle, ref NvClocks nvClocks);
    public delegate NvStatus NvAPI_GPU_GetPStatesDelegate(
      NvPhysicalGpuHandle gpuHandle, ref NvPStates nvPStates);
    public delegate NvStatus NvAPI_GPU_GetUsagesDelegate(
      NvPhysicalGpuHandle gpuHandle, ref NvUsages nvUsages);
    public delegate NvStatus NvAPI_GPU_GetCoolerSettingsDelegate(
      NvPhysicalGpuHandle gpuHandle, int coolerIndex,
      ref NvGPUCoolerSettings nvGPUCoolerSettings);
    public delegate NvStatus NvAPI_GPU_GetMemoryInfoDelegate(
      NvDisplayHandle displayHandle, ref NvMemoryInfo nvMemoryInfo);
    public delegate NvStatus NvAPI_GetDisplayDriverVersionDelegate(
      NvDisplayHandle displayHandle, [In, Out] ref NvDisplayDriverVersion
      nvDisplayDriverVersion);
    public delegate NvStatus NvAPI_GetInterfaceVersionStringDelegate(
      StringBuilder version);
 
    private static readonly bool available;
    private static readonly NvAPI_InitializeDelegate NvAPI_Initialize;
    private static readonly NvAPI_GPU_GetFullNameDelegate 
      _NvAPI_GPU_GetFullName;
    private static readonly NvAPI_GetInterfaceVersionStringDelegate
      _NvAPI_GetInterfaceVersionString;
 
    public static readonly NvAPI_GPU_GetThermalSettingsDelegate 
      NvAPI_GPU_GetThermalSettings;
    public static readonly NvAPI_EnumNvidiaDisplayHandleDelegate
      NvAPI_EnumNvidiaDisplayHandle;
    public static readonly NvAPI_GetPhysicalGPUsFromDisplayDelegate
      NvAPI_GetPhysicalGPUsFromDisplay;
    public static readonly NvAPI_EnumPhysicalGPUsDelegate
      NvAPI_EnumPhysicalGPUs;
    public static readonly NvAPI_GPU_GetTachReadingDelegate
      NvAPI_GPU_GetTachReading;
    public static readonly NvAPI_GPU_GetAllClocksDelegate
      NvAPI_GPU_GetAllClocks;
    public static readonly NvAPI_GPU_GetPStatesDelegate
      NvAPI_GPU_GetPStates;
    public static readonly NvAPI_GPU_GetUsagesDelegate
      NvAPI_GPU_GetUsages;
    public static readonly NvAPI_GPU_GetCoolerSettingsDelegate
      NvAPI_GPU_GetCoolerSettings;
    public static readonly NvAPI_GPU_GetMemoryInfoDelegate
      NvAPI_GPU_GetMemoryInfo;
    public static readonly NvAPI_GetDisplayDriverVersionDelegate
      NvAPI_GetDisplayDriverVersion;
 
    private NVAPI() { }
 
    public static NvStatus NvAPI_GPU_GetFullName(NvPhysicalGpuHandle gpuHandle,
      out string name) {
      StringBuilder builder = new StringBuilder(SHORT_STRING_MAX);
      NvStatus status;
      if (_NvAPI_GPU_GetFullName != null)
        status = _NvAPI_GPU_GetFullName(gpuHandle, builder);
      else
        status = NvStatus.FUNCTION_NOT_FOUND;
      name = builder.ToString();
      return status;
    }
 
    public static NvStatus NvAPI_GetInterfaceVersionString(out string version) {
      StringBuilder builder = new StringBuilder(SHORT_STRING_MAX);
      NvStatus status;
      if (_NvAPI_GetInterfaceVersionString != null)
        status = _NvAPI_GetInterfaceVersionString(builder);
      else
        status = NvStatus.FUNCTION_NOT_FOUND;
      version = builder.ToString();
      return status;
    }
 
    private static string GetDllName() {
      if (IntPtr.Size == 4) {
        return "nvapi.dll";
      } else {
        return "nvapi64.dll";
      }
    }
 
    private static void GetDelegate<T>(uint id, out T newDelegate) 
      where T : class 
    {
      IntPtr ptr = nvapi_QueryInterface(id);
      if (ptr != IntPtr.Zero) {
        newDelegate =
          Marshal.GetDelegateForFunctionPointer(ptr, typeof(T)) as T;
      } else {
        newDelegate = null;
      }
    }
 
    [DllImport("nvapi.dll", CallingConvention = CallingConvention.Cdecl)]
    static extern IntPtr nvapi_QueryInterface(uint id);
    
    static NVAPI() {
      try {
        GetDelegate(0x0150E828, out NvAPI_Initialize);
      } catch (DllNotFoundException) { return; } 
        catch (EntryPointNotFoundException) { return; } 
        catch (ArgumentNullException) { return; }
 
      if (NvAPI_Initialize() == NvStatus.OK) {
        GetDelegate(0xE3640A56, out NvAPI_GPU_GetThermalSettings);
        GetDelegate(0xCEEE8E9F, out _NvAPI_GPU_GetFullName);
        GetDelegate(0x9ABDD40D, out NvAPI_EnumNvidiaDisplayHandle);
        GetDelegate(0x34EF9506, out NvAPI_GetPhysicalGPUsFromDisplay);
        GetDelegate(0xE5AC921F, out NvAPI_EnumPhysicalGPUs);
        GetDelegate(0x5F608315, out NvAPI_GPU_GetTachReading);
        GetDelegate(0x1BD69F49, out NvAPI_GPU_GetAllClocks);
        GetDelegate(0x60DED2ED, out NvAPI_GPU_GetPStates);
        GetDelegate(0x189A1FDF, out NvAPI_GPU_GetUsages);
        GetDelegate(0xDA141340, out NvAPI_GPU_GetCoolerSettings);
        GetDelegate(0x774AA982, out NvAPI_GPU_GetMemoryInfo);
        GetDelegate(0xF951A4D1, out NvAPI_GetDisplayDriverVersion);
        GetDelegate(0x01053FA5, out _NvAPI_GetInterfaceVersionString);
 
        available = true;
      }
    }
 
    public static bool IsAvailable {
      get { return available; }
    }
 
  }
}

using System;
using System.Runtime.InteropServices;
using System.Text;
 
namespace WindowsFormsApplication24
{
    static class Program
    {
        [DllImport( "nvcpl.dll", CallingConvention = CallingConvention.Cdecl )]
        [return: MarshalAs( UnmanagedType.Bool )]
        static extern bool NvCplGetThermalSettings (
            uint nWindowsMonitorNumber,
            out uint pdwCoreTemp,
            out uint pdwAmbientTemp,
            out uint pdwUpperLimit
            );
 
        [DllImport( "nvcpl.dll", CallingConvention = CallingConvention.Cdecl )]
        static extern int NvGetLastError ( );
 
        [DllImport( "nvcpl.dll", CallingConvention = CallingConvention.Cdecl )]
        static extern StringBuilder NvGetLastErrorMessage ( );
 
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main ( )
        {
            //uint core, ambient, upper;
            //if (NvCplGetThermalSettings(0, out core, out ambient, out upper)) {
            //    Console.WriteLine("{0}\r\n{1}\r\n{2}", core, ambient, upper);
            //} else {
            //    Console.WriteLine("error: {0} msg: {1}", NvGetLastError(), NvGetLastErrorMessage().ToString());
            //}
            //Console.ReadLine();
            int count;
            var gpuHandles  = new Nvidia.NvPhysicalGpuHandle[64];
            var sensors     = new Nvidia.NvGPUThermalSettings();
            sensors.Sensor  = new Nvidia.NvSensor[3];
 
 
            var status = Nvidia.NVAPI.NvAPI_EnumPhysicalGPUs( gpuHandles, out count );
            if ( status != 0 )
            {
                Console.WriteLine( "Error! Status: {0}", status );
                return;
            }
 
            for ( int i = 0; i < count; ++i )
            {
                sensors.Version = 65604; // V2 struct
                sensors.Count = 3;
 
                status = Nvidia.NVAPI.NvAPI_GPU_GetThermalSettings( gpuHandles[i], 15, ref sensors );
 
                if ( status != 0 )
                {
                    Console.WriteLine( "Error! Status: {0}", status );
                    continue;
                }
 
                Console.WriteLine( "GPU Handle {0}", i );
 
                for ( int j = 0; j < sensors.Count; ++j )
                {
                    Console.WriteLine( "\tSensor: {0}", j );
                    Console.WriteLine( "\tNvThermalController: {0}", sensors.Sensor[j].Controller );
                    Console.WriteLine( "\tNvThermalTarget: {0}", sensors.Sensor[j].Target );
                    Console.WriteLine( "\tDefaultMinTemp: {0}", sensors.Sensor[j].DefaultMinTemp );
                    Console.WriteLine( "\tDefaultMaxTemp: {0}", sensors.Sensor[j].DefaultMaxTemp );
                    Console.WriteLine( "\tCurrentTemp: {0}", sensors.Sensor[j].CurrentTemp );
                    Console.WriteLine();
                }
            }
            Console.ReadLine();
            //Application.EnableVisualStyles();
            //Application.SetCompatibleTextRenderingDefault(false);
            //Application.Run(new Form1());
        }
    }
}

/*
  
  Version: MPL 1.1/GPL 2.0/LGPL 2.1
 
  The contents of this file are subject to the Mozilla Public License Version
  1.1 (the "License"); you may not use this file except in compliance with
  the License. You may obtain a copy of the License at
 
  [url]http://www.mozilla.org/MPL/[/url]
 
  Software distributed under the License is distributed on an "AS IS" basis,
  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  for the specific language governing rights and limitations under the License.
 
  The Original Code is the Open Hardware Monitor code.
 
  The Initial Developer of the Original Code is 
  Michael Möller <m.moeller@gmx.ch>.
  Portions created by the Initial Developer are Copyright (C) 2009-2010
  the Initial Developer. All Rights Reserved.
 
  Contributor(s):
 
  Alternatively, the contents of this file may be used under the terms of
  either the GNU General Public License Version 2 or later (the "GPL"), or
  the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  in which case the provisions of the GPL or the LGPL are applicable instead
  of those above. If you wish to allow use of your version of this file only
  under the terms of either the GPL or the LGPL, and not to allow others to
  use your version of this file under the terms of the MPL, indicate your
  decision by deleting the provisions above and replace them with the notice
  and other provisions required by the GPL or the LGPL. If you do not delete
  the provisions above, a recipient may use your version of this file under
  the terms of any one of the MPL, the GPL or the LGPL.
 
*/
 
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
 
namespace Nvidia
{
 
    public enum NvStatus
    {
        OK = 0,
        ERROR = -1,
        LIBRARY_NOT_FOUND = -2,
        NO_IMPLEMENTATION = -3,
        API_NOT_INTIALIZED = -4,
        INVALID_ARGUMENT = -5,
        NVIDIA_DEVICE_NOT_FOUND = -6,
        END_ENUMERATION = -7,
        INVALID_HANDLE = -8,
        INCOMPATIBLE_STRUCT_VERSION = -9,
        HANDLE_INVALIDATED = -10,
        OPENGL_CONTEXT_NOT_CURRENT = -11,
        NO_GL_EXPERT = -12,
        INSTRUMENTATION_DISABLED = -13,
        EXPECTED_LOGICAL_GPU_HANDLE = -100,
        EXPECTED_PHYSICAL_GPU_HANDLE = -101,
        EXPECTED_DISPLAY_HANDLE = -102,
        INVALID_COMBINATION = -103,
        NOT_SUPPORTED = -104,
        PORTID_NOT_FOUND = -105,
        EXPECTED_UNATTACHED_DISPLAY_HANDLE = -106,
        INVALID_PERF_LEVEL = -107,
        DEVICE_BUSY = -108,
        NV_PERSIST_FILE_NOT_FOUND = -109,
        PERSIST_DATA_NOT_FOUND = -110,
        EXPECTED_TV_DISPLAY = -111,
        EXPECTED_TV_DISPLAY_ON_DCONNECTOR = -112,
        NO_ACTIVE_SLI_TOPOLOGY = -113,
        SLI_RENDERING_MODE_NOTALLOWED = -114,
        EXPECTED_DIGITAL_FLAT_PANEL = -115,
        ARGUMENT_EXCEED_MAX_SIZE = -116,
        DEVICE_SWITCHING_NOT_ALLOWED = -117,
        TESTING_CLOCKS_NOT_SUPPORTED = -118,
        UNKNOWN_UNDERSCAN_CONFIG = -119,
        TIMEOUT_RECONFIGURING_GPU_TOPO = -120,
        DATA_NOT_FOUND = -121,
        EXPECTED_ANALOG_DISPLAY = -122,
        NO_VIDLINK = -123,
        REQUIRES_REBOOT = -124,
        INVALID_HYBRID_MODE = -125,
        MIXED_TARGET_TYPES = -126,
        SYSWOW64_NOT_SUPPORTED = -127,
        IMPLICIT_SET_GPU_TOPOLOGY_CHANGE_NOT_ALLOWED = -128,
        REQUEST_USER_TO_CLOSE_NON_MIGRATABLE_APPS = -129,
        OUT_OF_MEMORY = -130,
        WAS_STILL_DRAWING = -131,
        FILE_NOT_FOUND = -132,
        TOO_MANY_UNIQUE_STATE_OBJECTS = -133,
        INVALID_CALL = -134,
        D3D10_1_LIBRARY_NOT_FOUND = -135,
        FUNCTION_NOT_FOUND = -136
    }
 
    public enum NvThermalController
    {
        NONE = 0,
        GPU_INTERNAL,
        ADM1032,
        MAX6649,
        MAX1617,
        LM99,
        LM89,
        LM64,
        ADT7473,
        SBMAX6649,
        VBIOSEVT,
        OS,
        UNKNOWN = -1,
    }
 
    public enum NvThermalTarget
    {
        NONE = 0,
        GPU = 1,
        MEMORY = 2,
        POWER_SUPPLY = 4,
        BOARD = 8,
        ALL = 15,
        UNKNOWN = -1
    };
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvSensor
    {
        public NvThermalController Controller;
        public uint DefaultMinTemp;
        public uint DefaultMaxTemp;
        public uint CurrentTemp;
        public NvThermalTarget Target;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvGPUThermalSettings
    {
        public uint Version;
        public uint Count;
        [MarshalAs( UnmanagedType.ByValArray,
          SizeConst = NVAPI.MAX_THERMAL_SENSORS_PER_GPU )]
        public NvSensor[] Sensor;
    }
 
    [StructLayout( LayoutKind.Sequential )]
    public struct NvDisplayHandle
    {
        private readonly IntPtr ptr;
    }
 
    [StructLayout( LayoutKind.Sequential )]
    public struct NvPhysicalGpuHandle
    {
        private readonly IntPtr ptr;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvClocks
    {
        public uint Version;
        [MarshalAs( UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_CLOCKS_PER_GPU )]
        public uint[] Clock;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvPState
    {
        public bool Present;
        public int Percentage;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvPStates
    {
        public uint Version;
        public uint Flags;
        [MarshalAs( UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_PSTATES_PER_GPU )]
        public NvPState[] PStates;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvUsages
    {
        public uint Version;
        [MarshalAs( UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_USAGES_PER_GPU )]
        public uint[] Usage;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvCooler
    {
        public int Type;
        public int Controller;
        public int DefaultMin;
        public int DefaultMax;
        public int CurrentMin;
        public int CurrentMax;
        public int CurrentLevel;
        public int DefaultPolicy;
        public int CurrentPolicy;
        public int Target;
        public int ControlType;
        public int Active;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvGPUCoolerSettings
    {
        public uint Version;
        public uint Count;
        [MarshalAs( UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_COOLER_PER_GPU )]
        public NvCooler[] Cooler;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvMemoryInfo
    {
        public uint Version;
        [MarshalAs( UnmanagedType.ByValArray, SizeConst =
          NVAPI.MAX_MEMORY_VALUES_PER_GPU )]
        public uint[] Values;
    }
 
    [StructLayout( LayoutKind.Sequential, Pack = 8 )]
    public struct NvDisplayDriverVersion
    {
        public uint Version;
        public uint DriverVersion;
        public uint BldChangeListNum;
        [MarshalAs( UnmanagedType.ByValTStr, SizeConst = NVAPI.SHORT_STRING_MAX )]
        public string BuildBranch;
        [MarshalAs( UnmanagedType.ByValTStr, SizeConst = NVAPI.SHORT_STRING_MAX )]
        public string Adapter;
    }
 
    public class NVAPI
    {
 
        public const int MAX_PHYSICAL_GPUS = 64;
        public const int SHORT_STRING_MAX = 64;
 
        public const int MAX_THERMAL_SENSORS_PER_GPU = 3;
        public const int MAX_CLOCKS_PER_GPU = 0x120;
        public const int MAX_PSTATES_PER_GPU = 8;
        public const int MAX_USAGES_PER_GPU = 33;
        public const int MAX_COOLER_PER_GPU = 20;
        public const int MAX_MEMORY_VALUES_PER_GPU = 5;
 
        public static readonly uint GPU_THERMAL_SETTINGS_VER = (uint)
          Marshal.SizeOf( typeof( NvGPUThermalSettings ) ) | 0x10000;
        public static readonly uint GPU_CLOCKS_VER = (uint)
          Marshal.SizeOf( typeof( NvClocks ) ) | 0x20000;
        public static readonly uint GPU_PSTATES_VER = (uint)
          Marshal.SizeOf( typeof( NvPStates ) ) | 0x10000;
        public static readonly uint GPU_USAGES_VER = (uint)
          Marshal.SizeOf( typeof( NvUsages ) ) | 0x10000;
        public static readonly uint GPU_COOLER_SETTINGS_VER = (uint)
          Marshal.SizeOf( typeof( NvGPUCoolerSettings ) ) | 0x20000;
        public static readonly uint GPU_MEMORY_INFO_VER = (uint)
          Marshal.SizeOf( typeof( NvMemoryInfo ) ) | 0x20000;
        public static readonly uint DISPLAY_DRIVER_VERSION_VER = (uint)
          Marshal.SizeOf( typeof( NvDisplayDriverVersion ) ) | 0x10000;
 
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        private delegate NvStatus NvAPI_InitializeDelegate ( );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        private delegate NvStatus NvAPI_GPU_GetFullNameDelegate (
          NvPhysicalGpuHandle gpuHandle, StringBuilder name );
 
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GPU_GetThermalSettingsDelegate (
          NvPhysicalGpuHandle gpuHandle, int sensorIndex,
          ref NvGPUThermalSettings nvGPUThermalSettings );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_EnumNvidiaDisplayHandleDelegate ( int thisEnum,
          ref NvDisplayHandle displayHandle );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GetPhysicalGPUsFromDisplayDelegate (
          NvDisplayHandle displayHandle, [Out] NvPhysicalGpuHandle[] gpuHandles,
          out uint gpuCount );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_EnumPhysicalGPUsDelegate (
          [Out] NvPhysicalGpuHandle[] gpuHandles, out int gpuCount );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GPU_GetTachReadingDelegate (
          NvPhysicalGpuHandle gpuHandle, out int value );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GPU_GetAllClocksDelegate (
          NvPhysicalGpuHandle gpuHandle, ref NvClocks nvClocks );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GPU_GetPStatesDelegate (
          NvPhysicalGpuHandle gpuHandle, ref NvPStates nvPStates );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GPU_GetUsagesDelegate (
          NvPhysicalGpuHandle gpuHandle, ref NvUsages nvUsages );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GPU_GetCoolerSettingsDelegate (
          NvPhysicalGpuHandle gpuHandle, int coolerIndex,
          ref NvGPUCoolerSettings nvGPUCoolerSettings );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GPU_GetMemoryInfoDelegate (
          NvDisplayHandle displayHandle, ref NvMemoryInfo nvMemoryInfo );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GetDisplayDriverVersionDelegate (
          NvDisplayHandle displayHandle, [In, Out] ref NvDisplayDriverVersion
          nvDisplayDriverVersion );
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        public delegate NvStatus NvAPI_GetInterfaceVersionStringDelegate (
          StringBuilder version );
 
        private static readonly bool available;
        private static readonly NvAPI_InitializeDelegate NvAPI_Initialize;
        private static readonly NvAPI_GPU_GetFullNameDelegate 
      _NvAPI_GPU_GetFullName;
        private static readonly NvAPI_GetInterfaceVersionStringDelegate
      _NvAPI_GetInterfaceVersionString;
 
        public static readonly NvAPI_GPU_GetThermalSettingsDelegate 
      NvAPI_GPU_GetThermalSettings;
        public static readonly NvAPI_EnumNvidiaDisplayHandleDelegate
      NvAPI_EnumNvidiaDisplayHandle;
        public static readonly NvAPI_GetPhysicalGPUsFromDisplayDelegate
      NvAPI_GetPhysicalGPUsFromDisplay;
        public static readonly NvAPI_EnumPhysicalGPUsDelegate
      NvAPI_EnumPhysicalGPUs;
        public static readonly NvAPI_GPU_GetTachReadingDelegate
      NvAPI_GPU_GetTachReading;
        public static readonly NvAPI_GPU_GetAllClocksDelegate
      NvAPI_GPU_GetAllClocks;
        public static readonly NvAPI_GPU_GetPStatesDelegate
      NvAPI_GPU_GetPStates;
        public static readonly NvAPI_GPU_GetUsagesDelegate
      NvAPI_GPU_GetUsages;
        public static readonly NvAPI_GPU_GetCoolerSettingsDelegate
      NvAPI_GPU_GetCoolerSettings;
        public static readonly NvAPI_GPU_GetMemoryInfoDelegate
      NvAPI_GPU_GetMemoryInfo;
        public static readonly NvAPI_GetDisplayDriverVersionDelegate
      NvAPI_GetDisplayDriverVersion;
 
        private NVAPI ( ) { }
 
        public static NvStatus NvAPI_GPU_GetFullName ( NvPhysicalGpuHandle gpuHandle,
          out string name )
        {
            StringBuilder builder = new StringBuilder( SHORT_STRING_MAX );
            NvStatus status;
            if ( _NvAPI_GPU_GetFullName != null )
                status = _NvAPI_GPU_GetFullName( gpuHandle, builder );
            else
                status = NvStatus.FUNCTION_NOT_FOUND;
            name = builder.ToString();
            return status;
        }
 
        public static NvStatus NvAPI_GetInterfaceVersionString ( out string version )
        {
            StringBuilder builder = new StringBuilder( SHORT_STRING_MAX );
            NvStatus status;
            if ( _NvAPI_GetInterfaceVersionString != null )
                status = _NvAPI_GetInterfaceVersionString( builder );
            else
                status = NvStatus.FUNCTION_NOT_FOUND;
            version = builder.ToString();
            return status;
        }
 
        private static string GetDllName ( )
        {
            if ( IntPtr.Size == 4 )
            {
                return "nvapi.dll";
            }
            else
            {
                return "nvapi64.dll";
            }
        }
 
        private static void GetDelegate<T> ( uint id, out T newDelegate )
          where T : class
        {
            IntPtr ptr = nvapi_QueryInterface( id );
            if ( ptr != IntPtr.Zero )
            {
                newDelegate =
                  Marshal.GetDelegateForFunctionPointer( ptr, typeof( T ) ) as T;
            }
            else
            {
                newDelegate = null;
            }
        }
 
        [UnmanagedFunctionPointer( CallingConvention.Cdecl )]
        delegate IntPtr nvapi_QueryInterfaceDelegate ( uint id );
 
        static readonly nvapi_QueryInterfaceDelegate nvapi_QueryInterface;
 
        #region ~ Win32 API ~
 
        [DllImport( "kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode )]
        private static extern IntPtr LoadLibrary ( string lpFileName );
 
        [DllImport( "kernel32.dll", SetLastError = true, CharSet = CharSet.Ansi )]
        private static extern IntPtr GetProcAddress (
            IntPtr hModule,
            string lpProcName
            );
 
        #endregion
 
        //[DllImport( "nvapi.dll", CallingConvention = CallingConvention.Cdecl )]
        //static extern IntPtr nvapi_QueryInterface ( uint id );
 
        static NVAPI ( )
        {
            try
            {
                var hLib = LoadLibrary( GetDllName() );
                if ( hLib == IntPtr.Zero )
                    throw new Win32Exception();
 
                var pFunc = GetProcAddress( hLib, "nvapi_QueryInterface" );
                if ( pFunc == IntPtr.Zero )
                    throw new Win32Exception();
 
                nvapi_QueryInterface = (nvapi_QueryInterfaceDelegate)Marshal.GetDelegateForFunctionPointer( pFunc, typeof( nvapi_QueryInterfaceDelegate ) );
 
                GetDelegate( 0x0150E828, out NvAPI_Initialize );
            }
            catch ( DllNotFoundException ) { return; }
            catch ( EntryPointNotFoundException ) { return; }
            catch ( ArgumentNullException ) { return; }
 
            if ( NvAPI_Initialize() == NvStatus.OK )
            {
                GetDelegate( 0xE3640A56, out NvAPI_GPU_GetThermalSettings );
                GetDelegate( 0xCEEE8E9F, out _NvAPI_GPU_GetFullName );
                GetDelegate( 0x9ABDD40D, out NvAPI_EnumNvidiaDisplayHandle );
                GetDelegate( 0x34EF9506, out NvAPI_GetPhysicalGPUsFromDisplay );
                GetDelegate( 0xE5AC921F, out NvAPI_EnumPhysicalGPUs );
                GetDelegate( 0x5F608315, out NvAPI_GPU_GetTachReading );
                GetDelegate( 0x1BD69F49, out NvAPI_GPU_GetAllClocks );
                GetDelegate( 0x60DED2ED, out NvAPI_GPU_GetPStates );
                GetDelegate( 0x189A1FDF, out NvAPI_GPU_GetUsages );
                GetDelegate( 0xDA141340, out NvAPI_GPU_GetCoolerSettings );
                GetDelegate( 0x774AA982, out NvAPI_GPU_GetMemoryInfo );
                GetDelegate( 0xF951A4D1, out NvAPI_GetDisplayDriverVersion );
                GetDelegate( 0x01053FA5, out _NvAPI_GetInterfaceVersionString );
 
                available = true;
            }
        }
 
        public static bool IsAvailable
        {
            get { return available; }
        }
 
    }
}