다이렉트X 비디오 메모리 구하기

프로그래밍 관련/게임프로그래밍
by AlrepondTech 2016. 5. 26. 14:01
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출처: http://arcaneness.tistory.com/entry/%EB%B9%84%EB%94%94%EC%98%A4-%EB%A9%94%EB%AA%A8%EB%A6%AC-%EA%B5%AC%ED%95%98%EA%B8%B0
http://code.msdn.microsoft.com/windowsdesktop/DirectX-Video-Memory-ee7d8319
여기에 나온 방법으로 했어도 실시간으로 변화하는 GPU 메모리 사용량을 표시 할수는 없었다. 내가... 잘 못한건가?.. 어째든 실시간 비디오 메모리 사용량을 측정하기 위해 Nvidia를 떠돌며 삽질만 하다가 Nvapi.dll을 통하여 해결하였다.
// KGpuMon.h  源代码
#pragma once
 
#define MAX_GPU_NUM     4L      // 监控的GPU个数（NVIDIA定义的最多GPU个数是64，这里最多只监控4个）
#define MY_PROCESS_ERROR(Condition) do { if (!(Condition)) goto Exit0; } while (false)
 
#define MAX_DISPLAY_CARDS               4       // 最多监控4块显卡（暂时应该够了吧）
// 常量定义
#define MAX_PHYSICAL_GPUS               64
#define SHORT_STRING_MAX                64
#define MAX_THERMAL_SENSORS_PER_GPU     3
#define MAX_CLOCKS_PER_GPU              0x120
#define MAX_PSTATES_PER_GPU             8
#define MAX_USAGES_PER_GPU              33
#define MAX_COOLER_PER_GPU              20
#define MAX_MEMORY_VALUES_PER_GPU       5
 
// 接口ID值
#define ID_NvAPI_Initialize                     0x0150E828
#define ID_NvAPI_GPU_GetFullName                0xCEEE8E9F
#define ID_NvAPI_GPU_GetThermalSettings         0xE3640A56
#define ID_NvAPI_EnumNvidiaDisplayHandle        0x9ABDD40D
#define ID_NvAPI_GetPhysicalGPUsFromDisplay     0x34EF9506
#define ID_NvAPI_EnumPhysicalGPUs               0xE5AC921F
#define ID_NvAPI_GPU_GetTachReading             0x5F608315
#define ID_NvAPI_GPU_GetAllClocks               0x1BD69F49
#define ID_NvAPI_GPU_GetPStates                 0x60DED2ED
#define ID_NvAPI_GPU_GetUsages                  0x189A1FDF
#define ID_NvAPI_GPU_GetCoolerSettings          0xDA141340
#define ID_NvAPI_GPU_SetCoolerLevels            0x891FA0AE
#define ID_NvAPI_GPU_GetMemoryInfo              0x774AA982
#define ID_NvAPI_GetDisplayDriverVersion        0xF951A4D1
#define ID_NvAPI_GetInterfaceVersionString      0x01053FA5
#define ID_NvAPI_GPU_GetPCIIdentifiers          0x2DDFB66E
 
// 版本号参数定义
#define GPU_THERMAL_SETTINGS_VER                (sizeof(NvGPUThermalSettings) | 0x10000)
#define GPU_CLOCKS_VER                          (sizeof(NvClocks) | 0x20000)
#define GPU_PSTATES_VER                         (sizeof(NvPStates) | 0x10000)
#define GPU_USAGES_VER                          (sizeof(NvUsages) | 0x10000)
#define GPU_COOLER_SETTINGS_VER                 (sizeof(NvGPUCoolerSettings) | 0x20000)
#define GPU_MEMORY_INFO_VER                     (sizeof(NvMemoryInfo) | 0x20000)
#define DISPLAY_DRIVER_VERSION_VER              (sizeof(NvDisplayDriverVersion) | 0x10000)
#define GPU_COOLER_LEVELS_VER                   (sizeof(NvGPUCoolerLevels) | 0x10000)
 
enum NvStatus
{
    enumNvStatus_OK = 0,
    enumNvStatus_ERROR = -1,
    enumNvStatus_LIBRARY_NOT_FOUND = -2,
    enumNvStatus_NO_IMPLEMENTATION = -3,
    enumNvStatus_API_NOT_INTIALIZED = -4,
    enumNvStatus_INVALID_ARGUMENT = -5,
    enumNvStatus_NVIDIA_DEVICE_NOT_FOUND = -6,
    enumNvStatus_END_ENUMERATION = -7,
    enumNvStatus_INVALID_HANDLE = -8,
    enumNvStatus_INCOMPATIBLE_STRUCT_VERSION = -9,
    enumNvStatus_HANDLE_INVALIDATED = -10,
    enumNvStatus_OPENGL_CONTEXT_NOT_CURRENT = -11,
    enumNvStatus_NO_GL_EXPERT = -12,
    enumNvStatus_INSTRUMENTATION_DISABLED = -13,
    enumNvStatus_EXPECTED_LOGICAL_GPU_HANDLE = -100,
    enumNvStatus_EXPECTED_PHYSICAL_GPU_HANDLE = -101,
    enumNvStatus_EXPECTED_DISPLAY_HANDLE = -102,
    enumNvStatus_INVALID_COMBINATION = -103,
    enumNvStatus_NOT_SUPPORTED = -104,
    enumNvStatus_PORTID_NOT_FOUND = -105,
    enumNvStatus_EXPECTED_UNATTACHED_DISPLAY_HANDLE = -106,
    enumNvStatus_INVALID_PERF_LEVEL = -107,
    enumNvStatus_DEVICE_BUSY = -108,
    enumNvStatus_NV_PERSIST_FILE_NOT_FOUND = -109,
    enumNvStatus_PERSIST_DATA_NOT_FOUND = -110,
    enumNvStatus_EXPECTED_TV_DISPLAY = -111,
    enumNvStatus_EXPECTED_TV_DISPLAY_ON_DCONNECTOR = -112,
    enumNvStatus_NO_ACTIVE_SLI_TOPOLOGY = -113,
    enumNvStatus_SLI_RENDERING_MODE_NOTALLOWED = -114,
    enumNvStatus_EXPECTED_DIGITAL_FLAT_PANEL = -115,
    enumNvStatus_ARGUMENT_EXCEED_MAX_SIZE = -116,
    enumNvStatus_DEVICE_SWITCHING_NOT_ALLOWED = -117,
    enumNvStatus_TESTING_CLOCKS_NOT_SUPPORTED = -118,
    enumNvStatus_UNKNOWN_UNDERSCAN_CONFIG = -119,
    enumNvStatus_TIMEOUT_RECONFIGURING_GPU_TOPO = -120,
    enumNvStatus_DATA_NOT_FOUND = -121,
    enumNvStatus_EXPECTED_ANALOG_DISPLAY = -122,
    enumNvStatus_NO_VIDLINK = -123,
    enumNvStatus_REQUIRES_REBOOT = -124,
    enumNvStatus_INVALID_HYBRID_MODE = -125,
    enumNvStatus_MIXED_TARGET_TYPES = -126,
    enumNvStatus_SYSWOW64_NOT_SUPPORTED = -127,
    enumNvStatus_IMPLICIT_SET_GPU_TOPOLOGY_CHANGE_NOT_ALLOWED = -128,
    enumNvStatus_REQUEST_USER_TO_CLOSE_NON_MIGRATABLE_APPS = -129,
    enumNvStatus_OUT_OF_MEMORY = -130,
    enumNvStatus_WAS_STILL_DRAWING = -131,
    enumNvStatus_FILE_NOT_FOUND = -132,
    enumNvStatus_TOO_MANY_UNIQUE_STATE_OBJECTS = -133,
    enumNvStatus_INVALID_CALL = -134,
    enumNvStatus_D3D10_1_LIBRARY_NOT_FOUND = -135,
    enumNvStatus_FUNCTION_NOT_FOUND = -136
};
 
enum NvThermalController
{
    enumNvThermalController_NONE = 0,
    enumNvThermalController_GPU_INTERNAL,
    enumNvThermalController_ADM1032,
    enumNvThermalController_MAX6649,
    enumNvThermalController_MAX1617,
    enumNvThermalController_LM99,
    enumNvThermalController_LM89,
    enumNvThermalController_LM64,
    enumNvThermalController_ADT7473,
    enumNvThermalController_SBMAX6649,
    enumNvThermalController_VBIOSEVT,
    enumNvThermalController_OS,
    enumNvThermalController_UNKNOWN = -1,
};
 
enum NvThermalTarget
{
    enumNvThermalTarget_NONE = 0,
    enumNvThermalTarget_GPU = 1,
    enumNvThermalTarget_MEMORY = 2,
    enumNvThermalTarget_POWER_SUPPLY = 4,
    enumNvThermalTarget_BOARD = 8,
    enumNvThermalTarget_ALL = 15,
    enumNvThermalTarget_UNKNOWN = -1
};
 
typedef struct _NvSensor
{
    NvThermalController Controller;
    unsigned int DefaultMinTemp;
    unsigned int DefaultMaxTemp;
    unsigned int CurrentTemp;
    NvThermalTarget Target;
}NvSensor;
 
typedef struct _NvGPUThermalSettings
{
    unsigned int Version;
    unsigned int Count;
    NvSensor Sensor[MAX_THERMAL_SENSORS_PER_GPU];
}NvGPUThermalSettings;
 
typedef struct _NvClocks
{
    unsigned int Version;
    unsigned int Clock[MAX_CLOCKS_PER_GPU];
}NvClocks;
 
typedef struct _NvPState
{
    bool Present;
    int Percentage;
}NvPState;
 
typedef struct _NvPStates
{
    unsigned int Version;
    unsigned int Flags;
    NvPState PStates[MAX_PSTATES_PER_GPU];
}NvPStates;
 
typedef struct _NvUsages
{
    unsigned int Version;
    unsigned int Usages[MAX_USAGES_PER_GPU];
}NvUsages;
 
typedef struct _NvCooler
{
    int Type;
    int Controller;
    int DefaultMin;
    int DefaultMax;
    int CurrentMin;
    int CurrentMax;
    int CurrentLevel;
    int DefaultPolicy;
    int CurrentPolicy;
    int Target;
    int ControlType;
    int Active;
}NvCooler;
 
typedef struct _NvGPUCoolerSettings
{
    unsigned int Version;
    unsigned int Count;
    NvCooler Coolers[MAX_COOLER_PER_GPU];
}NvGPUCoolerSettings;
 
typedef struct _NvLevel
{
    int Level;
    int Policy;
}NvLevel;
 
typedef struct _NvGPUCoolerLevels
{
    unsigned int Version;
    NvLevel Levels[MAX_COOLER_PER_GPU];
}NvGPUCoolerLevels;
 
typedef struct _NvMemoryInfo
{
    unsigned int Version;
    unsigned int Values[MAX_MEMORY_VALUES_PER_GPU];
}NvMemoryInfo;
 
typedef struct _NvDisplayDriverVersion
{
    unsigned int Version;
    unsigned int DriverVersion;
    unsigned int BldChangeListNum;    
    char szBuildBranch[SHORT_STRING_MAX];
    char szAdapter[SHORT_STRING_MAX];
}NvDisplayDriverVersion;
 
typedef int NvPhysicalGpuHandle;
typedef int NvDisplayHandle;
 
// 函数定义
typedef void* (*nvapi_QueryInterfaceType)(unsigned int uiInterfaceID);
typedef NvStatus (*NvAPI_InitializeType)();
typedef NvStatus (*NvAPI_GPU_GetFullNameType)(const NvPhysicalGpuHandle gpuHandle, char *pszName);
typedef NvStatus (*NvAPI_GPU_GetThermalSettingsType)(const NvPhysicalGpuHandle gpuHandle, int sensorIndex, NvGPUThermalSettings *pnvGPUThermalSettings);
typedef NvStatus (*NvAPI_EnumNvidiaDisplayHandleType)(const int thisEnum, NvDisplayHandle *pDisplayHandle);
typedef NvStatus (*NvAPI_GetPhysicalGPUsFromDisplayType)(const NvDisplayHandle displayHandle, NvPhysicalGpuHandle *pGpuHandles, unsigned int *pGpuCount);
typedef NvStatus (*NvAPI_EnumPhysicalGPUsType)(NvPhysicalGpuHandle *pGpuHandles, int *pGpuCount);
typedef NvStatus (*NvAPI_GPU_GetTachReadingType)(const NvPhysicalGpuHandle gpuHandle, int *pnValue);
typedef NvStatus (*NvAPI_GPU_GetAllClocksType)(const NvPhysicalGpuHandle gpuHandle, NvClocks *pnvClocks);
typedef NvStatus (*NvAPI_GPU_GetPStatesType)(const NvPhysicalGpuHandle gpuHandle, NvPStates *pnvPStates);
typedef NvStatus (*NvAPI_GPU_GetUsagesType)(const NvPhysicalGpuHandle gpuHandle, NvUsages *pnvUsages);
typedef NvStatus (*NvAPI_GPU_GetCoolerSettingsType)(const NvPhysicalGpuHandle gpuHandle, int coolerIndex, NvGPUCoolerSettings *pnvGPUCoolerSettings);
typedef NvStatus (*NvAPI_GPU_SetCoolerLevelsType)(const NvPhysicalGpuHandle gpuHandle, int coolerIndex, NvGPUCoolerLevels *pnvGPUCoolerLevels);
typedef NvStatus (*NvAPI_GPU_GetMemoryInfoType)(const NvDisplayHandle displayHandle, NvMemoryInfo *pnvMemoryInfo);
typedef NvStatus (*NvAPI_GetDisplayDriverVersionType)(const NvDisplayHandle displayHandle, NvDisplayDriverVersion *pnvDisplayDriverVersion);
typedef NvStatus (*NvAPI_GetInterfaceVersionStringType)(char *pszVersion);
typedef NvStatus (*NvAPI_GPU_GetPCIIdentifiersType)(
    const NvPhysicalGpuHandle gpuHandle, 
    unsigned int *puiDeviceId, 
    unsigned int *puiSubSystemId, 
    unsigned int *puiRevisionId, 
    unsigned int *puiExtDeviceId
    );
 
//*****************************以下是类内部使用的结构体************************************//
/*
* @brief GPU信息
*/
typedef struct _GPU_INFO
{
    NvPhysicalGpuHandle     nvGpuHandle;        // GPU句柄
    int                     nUsage;             // GPU占用率
}GPU_INFO;
 
/*
* @brief 显卡信息
*/
typedef struct _DISPLAY_CARD_INFO
{
    NvDisplayHandle nvDisplayHandle;            // 显卡句柄
    int             nGpuCount;                  // Gpu个数
    DWORD           dwTotalMemory;              // 总显存大小（KB）
    DWORD           dwFreeMemory;               // 空闲显存大小（KB）
 
    GPU_INFO        sGpuInfo[MAX_GPU_NUM];      // GPU信息
}DISPLAY_CARD_INFO;
//*****************************************************************************************//
 
/*
* @brief 显卡相关信息（可用于导出的结构体）
*/
typedef struct _DISPLAY_INFO
{
    int         nGpuCount;                  // Gpu个数
    int         nGpuUsages[MAX_GPU_NUM];    // Gpu占用率
    DWORD       dwTotalMemory;              // 总显存大小（KB）
    DWORD       dwFreeMemory;               // 空闲显存大小（KB）
}DISPLAY_INFO;
 
class KGpuMon
{
public:
    KGpuMon(void);
    ~KGpuMon(void);
 
    BOOL Init();
    BOOL Unit();
 
    int GetDisplayCardCount();
    BOOL GetDisplayInfo(const int nCardIndex, DISPLAY_INFO *pDisplayInfo);
private:
    int     EnumDisplayCards();
    BOOL    GetGpuHandles(const NvDisplayHandle nvDisplayHandle, DISPLAY_CARD_INFO *pCardInfo);
 
    BOOL    GetDisplayCardGpuUsages(const NvDisplayHandle nvDisplayHandle, DISPLAY_CARD_INFO *pCardInfo);
    BOOL    GetDisplayCardMemoryInfo(const NvDisplayHandle nvDisplayHandle, DISPLAY_CARD_INFO *pCardInfo);
private:
    nvapi_QueryInterfaceType m_pfnNvapi_QueryInterface;
    NvAPI_InitializeType m_pfnNvAPI_Initialize;
    NvAPI_GPU_GetFullNameType m_pfnNvAPI_GPU_GetFullName;
    NvAPI_GPU_GetThermalSettingsType m_pfnNvAPI_GPU_GetThermalSettings;
    NvAPI_EnumNvidiaDisplayHandleType m_pfnNvAPI_EnumNvidiaDisplayHandle;
    NvAPI_GetPhysicalGPUsFromDisplayType m_pfnNvAPI_GetPhysicalGPUsFromDisplay;
    NvAPI_EnumPhysicalGPUsType m_pfnNvAPI_EnumPhysicalGPUs;
    NvAPI_GPU_GetTachReadingType m_pfnNvAPI_GPU_GetTachReading;
    NvAPI_GPU_GetAllClocksType m_pfnNvAPI_GPU_GetAllClocks;
    NvAPI_GPU_GetPStatesType m_pfnNvAPI_GPU_GetPStates;
    NvAPI_GPU_GetUsagesType m_pfnNvAPI_GPU_GetUsages;
    NvAPI_GPU_GetCoolerSettingsType m_pfnNvAPI_GPU_GetCoolerSettings;
    NvAPI_GPU_SetCoolerLevelsType m_pfnNvAPI_GPU_SetCoolerLevels;
    NvAPI_GPU_GetMemoryInfoType m_pfnNvAPI_GPU_GetMemoryInfo;
    NvAPI_GetDisplayDriverVersionType m_pfnNvAPI_GetDisplayDriverVersion;
    NvAPI_GetInterfaceVersionStringType m_pfnNvAPI_GetInterfaceVersionString;
    NvAPI_GPU_GetPCIIdentifiersType m_pfnNvAPI_GPU_GetPCIIdentifiers;
 
     
    int                 m_nDisplayCardCount;
    DISPLAY_CARD_INFO*  m_pDisplayCards;
    HMODULE             m_hNvApiDll;
};
 
 
//**************************************************************************************************/
// KGpuMon.cpp 源代码
#include "StdAfx.h"
#include "KGpuMon.h"
 
KGpuMon::KGpuMon(void)
{
    m_hNvApiDll = NULL;
    m_nDisplayCardCount = 0;
    m_pDisplayCards = NULL;
}
 
KGpuMon::~KGpuMon(void)
{
    Unit();
}
 
BOOL KGpuMon::Init()
{
    BOOL bResult = FALSE;
    BOOL bRetCode = FALSE;
 
    int nIndex = 0;
    int nResult = 0;
 
    m_hNvApiDll = LoadLibrary(_T("nvapi.dll"));
    if (m_hNvApiDll)
    {
        m_pfnNvapi_QueryInterface = (nvapi_QueryInterfaceType)GetProcAddress(m_hNvApiDll, "nvapi_QueryInterface");
        if (m_pfnNvapi_QueryInterface)
        {
            m_pfnNvAPI_Initialize = (NvAPI_InitializeType)m_pfnNvapi_QueryInterface(ID_NvAPI_Initialize);
            m_pfnNvAPI_GPU_GetFullName = (NvAPI_GPU_GetFullNameType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetFullName);
            m_pfnNvAPI_GPU_GetThermalSettings = (NvAPI_GPU_GetThermalSettingsType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetThermalSettings);
            m_pfnNvAPI_EnumNvidiaDisplayHandle = (NvAPI_EnumNvidiaDisplayHandleType)m_pfnNvapi_QueryInterface(ID_NvAPI_EnumNvidiaDisplayHandle);
            m_pfnNvAPI_GetPhysicalGPUsFromDisplay = (NvAPI_GetPhysicalGPUsFromDisplayType)m_pfnNvapi_QueryInterface(ID_NvAPI_GetPhysicalGPUsFromDisplay);
            m_pfnNvAPI_EnumPhysicalGPUs = (NvAPI_EnumPhysicalGPUsType)m_pfnNvapi_QueryInterface(ID_NvAPI_EnumPhysicalGPUs);
            m_pfnNvAPI_GPU_GetTachReading = (NvAPI_GPU_GetTachReadingType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetTachReading);
            m_pfnNvAPI_GPU_GetAllClocks = (NvAPI_GPU_GetAllClocksType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetAllClocks);
            m_pfnNvAPI_GPU_GetPStates = (NvAPI_GPU_GetPStatesType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetPStates);
            m_pfnNvAPI_GPU_GetUsages = (NvAPI_GPU_GetUsagesType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetUsages);
            m_pfnNvAPI_GPU_GetCoolerSettings = (NvAPI_GPU_GetCoolerSettingsType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetCoolerSettings);
            m_pfnNvAPI_GPU_SetCoolerLevels = (NvAPI_GPU_SetCoolerLevelsType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_SetCoolerLevels);
            m_pfnNvAPI_GPU_GetMemoryInfo = (NvAPI_GPU_GetMemoryInfoType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetMemoryInfo);
            m_pfnNvAPI_GetDisplayDriverVersion = (NvAPI_GetDisplayDriverVersionType)m_pfnNvapi_QueryInterface(ID_NvAPI_GetDisplayDriverVersion);
            m_pfnNvAPI_GetInterfaceVersionString = (NvAPI_GetInterfaceVersionStringType)m_pfnNvapi_QueryInterface(ID_NvAPI_GetInterfaceVersionString);
            m_pfnNvAPI_GPU_GetPCIIdentifiers = (NvAPI_GPU_GetPCIIdentifiersType)m_pfnNvapi_QueryInterface(ID_NvAPI_GPU_GetPCIIdentifiers);
 
            if (m_pfnNvAPI_Initialize)
            {
                nResult = m_pfnNvAPI_Initialize();
                if (enumNvStatus_OK == nResult)
                {
                    m_pDisplayCards = new DISPLAY_CARD_INFO[MAX_DISPLAY_CARDS];
                    ZeroMemory(m_pDisplayCards, MAX_DISPLAY_CARDS * sizeof(DISPLAY_CARD_INFO));
 
                    // 获取显卡个数
                    nResult = EnumDisplayCards();
                    MY_PROCESS_ERROR(nResult > 0);
 
                    // 获取每块显卡的GPU个数
                    for (nIndex = 0; nIndex < m_nDisplayCardCount; ++nIndex)
                    {
                        bRetCode = GetGpuHandles(m_pDisplayCards[nIndex].nvDisplayHandle, &m_pDisplayCards[nIndex]);
                        MY_PROCESS_ERROR(bRetCode);
                    }
 
                    bResult = TRUE;
                }
            }
        }
    }
Exit0:
    return bResult;
}
 
BOOL KGpuMon::Unit()
{
    m_nDisplayCardCount = 0;
 
    if (m_pDisplayCards)
    {
        delete []m_pDisplayCards;
        m_pDisplayCards = NULL;
    }
 
    if (m_hNvApiDll)
    {
        FreeLibrary(m_hNvApiDll);
        m_hNvApiDll = NULL;
    }
 
    return TRUE;
}
 
BOOL KGpuMon::GetDisplayInfo(const int nCardIndex, DISPLAY_INFO *pDisplayInfo)
{
    BOOL bResult = FALSE;
 
    int nIndex = 0;
 
    if (nCardIndex < m_nDisplayCardCount)
    {
        bResult = GetDisplayCardGpuUsages(m_pDisplayCards[nCardIndex].nvDisplayHandle, &m_pDisplayCards[nCardIndex]);
        MY_PROCESS_ERROR(bResult);
 
        pDisplayInfo->nGpuCount = m_pDisplayCards[nCardIndex].nGpuCount;
        for (nIndex = 0; nIndex < pDisplayInfo->nGpuCount; ++nIndex)
        {
            pDisplayInfo->nGpuUsages[nIndex] = m_pDisplayCards[nCardIndex].sGpuInfo[nIndex].nUsage;
        }
 
        bResult = GetDisplayCardMemoryInfo(m_pDisplayCards[nCardIndex].nvDisplayHandle, &m_pDisplayCards[nCardIndex]);
        MY_PROCESS_ERROR(bResult);
 
        pDisplayInfo->dwTotalMemory = m_pDisplayCards[nCardIndex].dwTotalMemory;
        pDisplayInfo->dwFreeMemory = m_pDisplayCards[nCardIndex].dwFreeMemory;
    }
Exit0:
    return bResult;
}
 
int KGpuMon::GetDisplayCardCount()
{
    return m_nDisplayCardCount;
}
 
int KGpuMon::EnumDisplayCards()
{
    NvStatus nvResult;
    NvDisplayHandle nvDisplayCardHandle;
 
    int nIndex = 0;
 
    m_nDisplayCardCount = 0;
    if (m_pfnNvAPI_EnumNvidiaDisplayHandle)
    {
        for (nIndex = 0; nIndex < MAX_DISPLAY_CARDS; ++nIndex)
        {
            nvResult = m_pfnNvAPI_EnumNvidiaDisplayHandle(nIndex, &nvDisplayCardHandle);
            if (enumNvStatus_OK == nvResult)
            {
                m_pDisplayCards[m_nDisplayCardCount].nvDisplayHandle = nvDisplayCardHandle;
                ++m_nDisplayCardCount;
            }
        }
    }
 
    return m_nDisplayCardCount;
}
 
BOOL KGpuMon::GetGpuHandles(const NvDisplayHandle nvDisplayHandle, DISPLAY_CARD_INFO *pCardInfo)
{
    BOOL bResult = FALSE;
 
    NvStatus nvStatus;
    NvPhysicalGpuHandle *pnvHandles = NULL;
 
    int nIndex = 0;
    unsigned int uiGpuCount = 0;
 
    if (m_pfnNvAPI_GetPhysicalGPUsFromDisplay)
    {
        pnvHandles = new NvPhysicalGpuHandle[MAX_PHYSICAL_GPUS];
        nvStatus = m_pfnNvAPI_GetPhysicalGPUsFromDisplay(nvDisplayHandle, pnvHandles, &uiGpuCount);
        if (enumNvStatus_OK == nvStatus)
        {
            pCardInfo->nGpuCount = min(uiGpuCount, MAX_GPU_NUM);
            for (nIndex = 0; nIndex < pCardInfo->nGpuCount; ++nIndex)
            {
                pCardInfo->sGpuInfo[nIndex].nvGpuHandle = pnvHandles[nIndex];
            }
 
            bResult = TRUE;
        }
 
        delete []pnvHandles;
        pnvHandles = NULL;
    }
 
    return bResult;
}
 
BOOL KGpuMon::GetDisplayCardGpuUsages(const NvDisplayHandle nvDisplayHandle, DISPLAY_CARD_INFO *pCardInfo)
{
    BOOL bResult = FALSE;
 
    int nIndex = 0;
 
    NvStatus nvStatus = enumNvStatus_ERROR;
    NvUsages *pnvUsages = NULL;
 
    if (m_pfnNvAPI_GPU_GetUsages)
    {
        pnvUsages = new NvUsages;
        pnvUsages->Version = GPU_USAGES_VER;
        for (nIndex = 0; nIndex < pCardInfo->nGpuCount; ++nIndex)
        {
            nvStatus = m_pfnNvAPI_GPU_GetUsages(pCardInfo->sGpuInfo[nIndex].nvGpuHandle, pnvUsages);
            if (enumNvStatus_OK == nvStatus)
            {
                pCardInfo->sGpuInfo[nIndex].nUsage = pnvUsages->Usages[2];
            }
        }
 
        delete pnvUsages;
        pnvUsages = NULL;
 
        bResult = (enumNvStatus_OK == nvStatus) ? TRUE : FALSE;
    }
 
    return bResult;
}
 
BOOL KGpuMon::GetDisplayCardMemoryInfo(const NvDisplayHandle nvDisplayHandle, DISPLAY_CARD_INFO *pCardInfo)
{
    BOOL bResult = FALSE;
 
    int nIndex = 0;
 
    NvStatus nvStatus = enumNvStatus_ERROR;
    NvUsages *pnvUsages = NULL;
    NvMemoryInfo sMemoryInfo;
 
    if (m_pfnNvAPI_GPU_GetMemoryInfo)
    {
        sMemoryInfo.Version = GPU_MEMORY_INFO_VER;
        nvStatus = m_pfnNvAPI_GPU_GetMemoryInfo(nvDisplayHandle, &sMemoryInfo);
        if (enumNvStatus_OK == nvStatus)
        {
            pCardInfo->dwTotalMemory = (DWORD)(sMemoryInfo.Values[0]);
            pCardInfo->dwFreeMemory = (DWORD)(sMemoryInfo.Values[4]);
 
            bResult = TRUE;
        }
    }
 
    return bResult;
}
http://blog.csdn.net/paopaoc/article/details/9093125
=================================
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