カウンターデータの取得

[アーティクル]
06/12/2023
パフォーマンスオブジェクトでは、1 つ以上のカウンターを定義できます。カウンターのカウンターデータは、 PERF_COUNTER_BLOCK メモリブロックにあります。オブジェクトブロック内のカウンターブロックの場所は、オブジェクトに 1 つのインスタンスカウンターが含まれているか、複数のインスタンスカウンターが含まれているかによって異なります。詳細については、「パフォーマンスデータ形式」を参照してください。
カウンターブロック内のカウンターのデータにアクセスするには、PERF_COUNTER_DEFINITIONの CounterOffset メンバーと CounterSize メンバーを使用します。現在、カウンターデータは DWORD データ型と ULONGLONG データ型に制限されています (パフォーマンスツールでサポートされている型はこれらのみです)。
PERF_COUNTER_DEFINITION の CounterType メンバーは、カウンターデータを使用するためにパフォーマンスオブジェクトから必要なその他の情報を通知します。カウンターによっては、カウンターデータを直接使用できますが、表示可能な値を計算するために、時間ベースの情報や別のカウンターからのデータが必要な場合があります。
次の例は、カウンターの種類を使用して、表示可能なカウンター値を計算するためにカウンターのパフォーマンスデータから取得する必要がある情報を決定する方法を示しています。カウンターの種類に基づいて表示可能な値を計算する例については、「カウンター値の計算」を参照してください。
#include <windows.h>
#include <stdio.h>
#include <strsafe.h>

#pragma comment(lib, "advapi32.lib")

// Contains the elements required to calculate a counter value.
typedef struct _rawdata
{
    DWORD CounterType;
    ULONGLONG Data;          // Raw counter data
    LONGLONG Time;           // Is a time value or a base value
    DWORD MultiCounterData;  // Second raw counter value for multi-valued counters
    LONGLONG Frequency;
}RAW_DATA, *PRAW_DATA;

#define INIT_OBJECT_BUFFER_SIZE 48928   // Initial buffer size to use when querying specific objects.
#define INIT_GLOBAL_BUFFER_SIZE 122880  // Initial buffer size to use when using "Global" to query all objects.
#define BUFFER_INCREMENT 16384          // Increment buffer size in 16K chunks.
#define MAX_INSTANCE_NAME_LEN      255  // Max length of an instance name.
#define MAX_FULL_INSTANCE_NAME_LEN 511  // Form is parentinstancename/instancename#nnn.

LPBYTE GetPerformanceData(LPWSTR pwszSource, DWORD dwInitialBufferSize);
BOOL GetCounterValues(DWORD dwObjectIndex, DWORD dwCounterIndex, LPWSTR pInstanceName, RAW_DATA* pRawData);
BOOL GetValue(PERF_OBJECT_TYPE* pObject, PERF_COUNTER_DEFINITION* pCounter, PERF_COUNTER_BLOCK* pCounterDataBlock, PRAW_DATA pRawData);
PERF_COUNTER_BLOCK* GetCounterBlock(PERF_OBJECT_TYPE* pObject, LPWSTR pInstanceName);
PERF_COUNTER_DEFINITION* GetCounter(PERF_OBJECT_TYPE* pObject, DWORD dwCounterToFind);
PERF_OBJECT_TYPE* GetObject(DWORD dwObjectToFind);
PERF_INSTANCE_DEFINITION* GetObjectInstance(PERF_OBJECT_TYPE* pObject, LPWSTR pInstanceName);
DWORD GetSerialNo(LPWSTR pInstanceName);
BOOL GetFullInstanceName(PERF_INSTANCE_DEFINITION* pInstance, DWORD CodePage, WCHAR* pName);
BOOL ConvertNameToUnicode(UINT CodePage, LPCSTR pNameToConvert, DWORD dwNameToConvertLen, LPWSTR pConvertedName);
PERF_INSTANCE_DEFINITION* GetParentInstance(PERF_OBJECT_TYPE* pObject, DWORD dwInstancePosition);
BOOL DisplayCalculatedValue(RAW_DATA* pSample1, RAW_DATA* pSample2);

//Global variables
LPBYTE g_pPerfDataHead = NULL;   // Head of the performance data.

void wmain(void)
{
    RAW_DATA Sample1;
    RAW_DATA Sample2;
    BOOL fSuccess = FALSE;

    // Retrieve counter data for the Processor object.
    g_pPerfDataHead = (LPBYTE)GetPerformanceData(L"238", INIT_OBJECT_BUFFER_SIZE);
    if (NULL == g_pPerfDataHead)
    {
        wprintf(L"GetPerformanceData failed.\n");
        goto cleanup;
    }

    // Then, sample the "% Processor Time" counter for instance "0" of the Processor object.
    fSuccess = GetCounterValues(238, 6, L"0", &Sample1);
    if (FALSE == fSuccess)
    {
        wprintf(L"GetCounterValues failed.\n");
        goto cleanup;
    }

    // Display five data points for the counter.
    for (DWORD i = 0; i < 5; i++)
    {
        Sleep(1000);  // Wait one second before taking the next sample

        // Retrieve the object data again and get the next sample.
        g_pPerfDataHead = (LPBYTE)GetPerformanceData(L"238", INIT_OBJECT_BUFFER_SIZE);
        if (NULL == g_pPerfDataHead)
        {
            wprintf(L"GetPerformanceData in loop failed.\n");
            goto cleanup;
        }

        fSuccess = GetCounterValues(238, 6, L"0", &Sample2);
        if (FALSE == fSuccess)
        {
            wprintf(L"GetCounterValues failed.\n");
            goto cleanup;
        }

        // Calculate the value based on the two samples. For counter
        // types that do not use two samples, set the second parameter
        // to NULL.
        fSuccess = DisplayCalculatedValue(&Sample1, &Sample2);
        if (FALSE == fSuccess)
        {
            wprintf(L"DisplayCalculatedValue failed.\n");
            goto cleanup;
        }

        // Sample2 becomes Sample1 for the next iteration.
        memcpy(&Sample1, &Sample2, sizeof(RAW_DATA));
    }

cleanup:

    if (g_pPerfDataHead)
        free(g_pPerfDataHead);
}


// Retrieve a buffer that contains the specified performance data.
// The pwszSource parameter determines the data that GetRegistryBuffer returns.
//
// Typically, when calling RegQueryValueEx, you can specify zero for the size of the buffer
// and the RegQueryValueEx will set your size variable to the required buffer size. However, 
// if the source is "Global" or one or more object index values, you will need to increment
// the buffer size in a loop until RegQueryValueEx does not return ERROR_MORE_DATA. 
LPBYTE GetPerformanceData(LPWSTR pwszSource, DWORD dwInitialBufferSize)
{
    LPBYTE pBuffer = NULL;
    DWORD dwBufferSize = 0;        //Size of buffer, used to increment buffer size
    DWORD dwSize = 0;              //Size of buffer, used when calling RegQueryValueEx
    LPBYTE pTemp = NULL;           //Temp variable for realloc() in case it fails
    LONG status = ERROR_SUCCESS; 

    dwBufferSize = dwSize = dwInitialBufferSize;

    pBuffer = (LPBYTE)malloc(dwBufferSize);
    if (pBuffer)
    {
        while (ERROR_MORE_DATA == (status = RegQueryValueEx(HKEY_PERFORMANCE_DATA, pwszSource, NULL, NULL, pBuffer, &dwSize)))
        {
            //Contents of dwSize is unpredictable if RegQueryValueEx fails, which is why
            //you need to increment dwBufferSize and use it to set dwSize.
            dwBufferSize += BUFFER_INCREMENT;

            pTemp = (LPBYTE)realloc(pBuffer, dwBufferSize);
            if (pTemp)
            {
                pBuffer = pTemp;
                dwSize = dwBufferSize;
            }
            else
            {
                wprintf(L"Reallocation error.\n");
                free(pBuffer);
                pBuffer = NULL;
                goto cleanup;
            }
        }

        if (ERROR_SUCCESS != status)
        {
            wprintf(L"RegQueryValueEx failed with 0x%x.\n", status);
            free(pBuffer);
            pBuffer = NULL;
        }
    }
    else
    {
        wprintf(L"malloc failed to allocate initial memory request.\n");
    }

cleanup:

    RegCloseKey(HKEY_PERFORMANCE_DATA);

    return pBuffer;
}


// Use the object index to find the object in the performance data. Then, use the
// counter index to find the counter definition. The definition contains the offset
// to the counter data in the counter block. The location of the counter block 
// depends on whether the counter is a single instance counter or multiple instance counter.
// After finding the counter block, retrieve the counter data.
BOOL GetCounterValues(DWORD dwObjectIndex, DWORD dwCounterIndex, LPWSTR pInstanceName, RAW_DATA* pRawData)
{
    PERF_OBJECT_TYPE* pObject = NULL;
    PERF_COUNTER_DEFINITION* pCounter = NULL;
    PERF_COUNTER_BLOCK* pCounterDataBlock = NULL;
    BOOL fSuccess = FALSE;

    pObject = GetObject(dwObjectIndex);
    if (NULL == pObject)
    {
        wprintf(L"Object  %d not found.\n", dwObjectIndex);
        goto cleanup;
    }

    pCounter = GetCounter(pObject, dwCounterIndex);
    if (NULL == pCounter)
    {
        wprintf(L"Counter %d not found.\n", dwCounterIndex);
        goto cleanup;
    }

    // Retrieve a pointer to the beginning of the counter data block. The counter data
    // block contains all the counter data for the object.
    pCounterDataBlock = GetCounterBlock(pObject, pInstanceName);
    if (NULL == pCounterDataBlock)
    {
        wprintf(L"Instance %s not found.\n", pInstanceName);
        goto cleanup;
    }

    ZeroMemory(pRawData, sizeof(RAW_DATA));
    pRawData->CounterType = pCounter->CounterType;
    fSuccess = GetValue(pObject, pCounter, pCounterDataBlock, pRawData);

cleanup:

    return fSuccess;
}


// Use the object index to find the object in the performance data.
PERF_OBJECT_TYPE* GetObject(DWORD dwObjectToFind)
{
    LPBYTE pObject = g_pPerfDataHead + ((PERF_DATA_BLOCK*)g_pPerfDataHead)->HeaderLength;
    DWORD dwNumberOfObjects = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->NumObjectTypes;
    BOOL fFoundObject = FALSE;

    for (DWORD i = 0; i < dwNumberOfObjects; i++)
    {
        if (dwObjectToFind == ((PERF_OBJECT_TYPE*)pObject)->ObjectNameTitleIndex)
        {
            fFoundObject = TRUE;
            break;
        }

        pObject += ((PERF_OBJECT_TYPE*)pObject)->TotalByteLength;
    }

    return (fFoundObject) ? (PERF_OBJECT_TYPE*)pObject : NULL;  
}

// Use the counter index to find the object in the performance data.
PERF_COUNTER_DEFINITION* GetCounter(PERF_OBJECT_TYPE* pObject, DWORD dwCounterToFind)
{
    PERF_COUNTER_DEFINITION* pCounter = (PERF_COUNTER_DEFINITION*)((LPBYTE)pObject + pObject->HeaderLength);
    DWORD dwNumberOfCounters = pObject->NumCounters;
    BOOL fFoundCounter = FALSE;

    for (DWORD i = 0; i < dwNumberOfCounters; i++)
    {
        if (pCounter->CounterNameTitleIndex == dwCounterToFind)
        {
            fFoundCounter = TRUE;
            break;
        }

        pCounter++;
    }

    return (fFoundCounter) ? pCounter : NULL;
}


// Returns a pointer to the beginning of the PERF_COUNTER_BLOCK. The location of the 
// of the counter data block depends on whether the object contains single instance
// counters or multiple instance counters (see PERF_OBJECT_TYPE.NumInstances).
PERF_COUNTER_BLOCK* GetCounterBlock(PERF_OBJECT_TYPE* pObject, LPWSTR pInstanceName)
{
    PERF_COUNTER_BLOCK* pBlock = NULL;
    PERF_INSTANCE_DEFINITION* pInstance = NULL;

    // If there are no instances, the block follows the object and counter structures.
    if (0 == pObject->NumInstances || PERF_NO_INSTANCES == pObject->NumInstances) 
    {                                
        pBlock = (PERF_COUNTER_BLOCK*)((LPBYTE)pObject + pObject->DefinitionLength);
    }
    else if (pObject->NumInstances > 0 && pInstanceName)  // Find the instance. The block follows the instance
    {                                                     // structure and instance name.
        pInstance = GetObjectInstance(pObject, pInstanceName);
        if (pInstance)
        {
            pBlock = (PERF_COUNTER_BLOCK*)((LPBYTE)pInstance + pInstance->ByteLength);
        }
    }

    return pBlock;
}


// If the instance names are unique (there will never be more than one instance
// with the same name), then finding the same instance is not an issue. However, 
// if the instance names are not unique, there is no guarantee that the instance 
// whose counter value you are retrieving is the same instance from which you previously
// retrieved data. This function expects the instance name to be well formed. For 
// example, a process object could have four instances with each having svchost as its name.
// Since service hosts come and go, there is no way to determine if you are dealing with 
// the same instance.
// Starting in Windows 11, use the "Process V2" counterset to avoid this issue.
//
// The convention for specifying an instance is parentinstancename/instancename#nnn.
// If only instancename is specified, the first instance found that matches the name is used.
// Specify parentinstancename if the instance is the child of a parent instance.
PERF_INSTANCE_DEFINITION* GetObjectInstance(PERF_OBJECT_TYPE* pObject, LPWSTR pInstanceName)
{
    PERF_INSTANCE_DEFINITION* pInstance = (PERF_INSTANCE_DEFINITION*)((LPBYTE)pObject + pObject->DefinitionLength);
    BOOL fSuccess = FALSE;
    WCHAR szName[MAX_FULL_INSTANCE_NAME_LEN + 1];
    PERF_COUNTER_BLOCK* pCounterBlock = NULL;
    DWORD dwSerialNo = GetSerialNo(pInstanceName);
    DWORD dwOccurrencesFound = 0;
    DWORD dwNameLen = 0;
    DWORD dwInputNameLen = (DWORD)wcslen(pInstanceName);

    for (LONG i = 0; i < pObject->NumInstances; i++)
    {
        GetFullInstanceName(pInstance, pObject->CodePage, szName);
        if ((dwNameLen = (DWORD)wcslen(szName)) <= dwInputNameLen)
        {
            if (0 == _wcsnicmp(szName, pInstanceName, dwNameLen))  // The name matches
            {
                dwOccurrencesFound++;

                // If the input name does not specify an nth instance or
                // the nth instance has been found, return the instance.
                // It is 'dwSerialNo+1' because cmd#3 is the fourth occurrence.
                if (0 == dwSerialNo || dwOccurrencesFound == (dwSerialNo+1))
                {
                    return pInstance;
                }
            }
        }

        pCounterBlock = (PERF_COUNTER_BLOCK*)((LPBYTE)pInstance + pInstance->ByteLength);
        pInstance = (PERF_INSTANCE_DEFINITION*)((LPBYTE)pInstance + pInstance->ByteLength + pCounterBlock->ByteLength);
    }

    return NULL;
}


// Parses the instance name for the serial number. The convention is to use
// a serial number appended to the instance name to identify a specific
// instance when the instance names are not unique. For example, to specify
// the fourth instance of svchost, use svchost#3 (the first occurrence does
// not include a serial number).
DWORD GetSerialNo(LPWSTR pInstanceName)
{
    LPWSTR pSerialNo = NULL;
    DWORD dwLength = 0;
    DWORD value = 0;

    pSerialNo = wcschr(pInstanceName, '#');
    if (pSerialNo)
    {
        pSerialNo++;
        value = _wtoi(pSerialNo);
    }

    return value;
}


// Retrieve the full name of the instance. The full name of the instance includes
// the name of this instance and its parent instance, if this instance is a 
// child instance. The full name is in the form, "parent name/child name".
// For example, a thread instance is a child of a process instance. 
//
// Providers are encouraged to use Unicode strings for instance names. If 
// PERF_INSTANCE_DEFINITION.CodePage is zero, the name is in Unicode; otherwise,
// use the CodePage value to convert the string to Unicode.
BOOL GetFullInstanceName(PERF_INSTANCE_DEFINITION* pInstance, DWORD CodePage, WCHAR* pName)
{
    BOOL fSuccess = TRUE;
    PERF_INSTANCE_DEFINITION *pParentInstance = NULL;
    PERF_OBJECT_TYPE *pParentObject = NULL;
    DWORD dwLength = 0;
    WCHAR wszInstanceName[MAX_INSTANCE_NAME_LEN+1];
    WCHAR wszParentInstanceName[MAX_INSTANCE_NAME_LEN+1];

    if (CodePage == 0)  // Instance name is a Unicode string
    {
        // PERF_INSTANCE_DEFINITION->NameLength is in bytes, so convert to characters.
        dwLength = (MAX_INSTANCE_NAME_LEN < (pInstance->NameLength/2)) ? MAX_INSTANCE_NAME_LEN : pInstance->NameLength/2;
        StringCchCopyN(wszInstanceName, MAX_INSTANCE_NAME_LEN+1, (LPWSTR)(((LPBYTE)pInstance)+pInstance->NameOffset), dwLength);
        wszInstanceName[dwLength] = '\0';
    }
    else  // Convert the multi-byte instance name to Unicode
    {
        fSuccess = ConvertNameToUnicode(CodePage, 
            (LPCSTR)(((LPBYTE)pInstance)+pInstance->NameOffset),  // Points to string
            pInstance->NameLength,
            wszInstanceName);

        if (FALSE == fSuccess)
        {
            wprintf(L"ConvertNameToUnicode for instance failed.\n");
            goto cleanup;
        }
    }

    if (pInstance->ParentObjectTitleIndex)
    {
        // Use the index to find the parent object. The pInstance->ParentObjectInstance
        // member tells you that the parent instance is the nth instance of the 
        // parent object.
        pParentObject = GetObject(pInstance->ParentObjectTitleIndex);
        pParentInstance = GetParentInstance(pParentObject, pInstance->ParentObjectInstance);

        if (CodePage == 0)  // Instance name is a Unicode string
        {
            dwLength = (MAX_INSTANCE_NAME_LEN < pParentInstance->NameLength/2) ? MAX_INSTANCE_NAME_LEN : pParentInstance->NameLength/2;
            StringCchCopyN(wszParentInstanceName, MAX_INSTANCE_NAME_LEN+1, (LPWSTR)(((LPBYTE)pParentInstance)+pParentInstance->NameOffset), dwLength);
            wszParentInstanceName[dwLength] = '\0';
        }
        else  // Convert the multi-byte instance name to Unicode
        {
            fSuccess = ConvertNameToUnicode(CodePage, 
                (LPCSTR)(((LPBYTE)pParentInstance)+pParentInstance->NameOffset),  //Points to string.
                pInstance->NameLength,
                wszParentInstanceName);

            if (FALSE == fSuccess)
            {
                wprintf(L"ConvertNameToUnicode for parent instance failed.\n");
                goto cleanup;
            }
        }

        StringCchPrintf(pName, MAX_FULL_INSTANCE_NAME_LEN+1, L"%s/%s", wszParentInstanceName, wszInstanceName);
    }
    else
    {
        StringCchPrintf(pName, MAX_INSTANCE_NAME_LEN+1, L"%s", wszInstanceName);
    }

cleanup:

    return fSuccess;
}


// Converts a multi-byte string to a Unicode string. If the input string is longer than 
// MAX_INSTANCE_NAME_LEN, the input string is truncated.
BOOL ConvertNameToUnicode(UINT CodePage, LPCSTR pNameToConvert, DWORD dwNameToConvertLen, LPWSTR pConvertedName)
{
    BOOL fSuccess = FALSE;
    int CharsConverted = 0;
    DWORD dwLength = 0;

    // dwNameToConvertLen is in bytes, so convert MAX_INSTANCE_NAME_LEN to bytes.
    dwLength = (MAX_INSTANCE_NAME_LEN*sizeof(WCHAR) < (dwNameToConvertLen)) ? MAX_INSTANCE_NAME_LEN*sizeof(WCHAR) : dwNameToConvertLen;

    CharsConverted = MultiByteToWideChar((UINT)CodePage, 0, pNameToConvert, dwLength, pConvertedName, MAX_INSTANCE_NAME_LEN);
    if (CharsConverted)
    {
        pConvertedName[dwLength] = '\0';
        fSuccess = TRUE;
    }

    return fSuccess;
}


// Find the nth instance of an object.
PERF_INSTANCE_DEFINITION* GetParentInstance(PERF_OBJECT_TYPE* pObject, DWORD dwInstancePosition)
{
    LPBYTE pInstance = (LPBYTE)pObject + pObject->DefinitionLength;
    PERF_COUNTER_BLOCK* pCounter = NULL;

    for (DWORD i = 0; i < dwInstancePosition; i++)
    {
        pCounter = (PERF_COUNTER_BLOCK*)(pInstance + ((PERF_INSTANCE_DEFINITION*)pInstance)->ByteLength);
        pInstance += ((PERF_INSTANCE_DEFINITION*)pInstance)->ByteLength + pCounter->ByteLength;
    }

    return (PERF_INSTANCE_DEFINITION*)pInstance;
}


// Retrieve the raw counter value and any supporting data needed to calculate
// a displayable counter value. Use the counter type to determine the information
// needed to calculate the value.
BOOL GetValue(PERF_OBJECT_TYPE* pObject, 
    PERF_COUNTER_DEFINITION* pCounter, 
    PERF_COUNTER_BLOCK* pCounterDataBlock, 
    PRAW_DATA pRawData)
{
    PVOID pData = NULL;
    UNALIGNED ULONGLONG* pullData = NULL;
    PERF_COUNTER_DEFINITION* pBaseCounter = NULL;
    BOOL fSuccess = TRUE;

    //Point to the raw counter data.
    pData = (PVOID)((LPBYTE)pCounterDataBlock + pCounter->CounterOffset);

    //Now use the PERF_COUNTER_DEFINITION.CounterType value to figure out what
    //other information you need to calculate a displayable value.
    switch (pCounter->CounterType) {

    case PERF_COUNTER_COUNTER:
    case PERF_COUNTER_QUEUELEN_TYPE:
    case PERF_SAMPLE_COUNTER:
        pRawData->Data = (ULONGLONG)(*(DWORD*)pData);
        pRawData->Time = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfTime.QuadPart;
        if (PERF_COUNTER_COUNTER == pCounter->CounterType || PERF_SAMPLE_COUNTER == pCounter->CounterType)
        {
            pRawData->Frequency = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfFreq.QuadPart;
        }
        break;

    case PERF_OBJ_TIME_TIMER:
        pRawData->Data = (ULONGLONG)(*(DWORD*)pData);
        pRawData->Time = pObject->PerfTime.QuadPart;
        break;

    case PERF_COUNTER_100NS_QUEUELEN_TYPE:
        pRawData->Data = *(UNALIGNED ULONGLONG *)pData;
        pRawData->Time = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfTime100nSec.QuadPart;
        break;

    case PERF_COUNTER_OBJ_TIME_QUEUELEN_TYPE:
        pRawData->Data = *(UNALIGNED ULONGLONG *)pData;
        pRawData->Time = pObject->PerfTime.QuadPart;
        break;

    case PERF_COUNTER_TIMER:
    case PERF_COUNTER_TIMER_INV:
    case PERF_COUNTER_BULK_COUNT:
    case PERF_COUNTER_LARGE_QUEUELEN_TYPE:
        pullData = (UNALIGNED ULONGLONG *)pData;
        pRawData->Data = *pullData;
        pRawData->Time = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfTime.QuadPart;
        if (pCounter->CounterType == PERF_COUNTER_BULK_COUNT)
        {
            pRawData->Frequency = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfFreq.QuadPart;
        }
        break;

    case PERF_COUNTER_MULTI_TIMER:
    case PERF_COUNTER_MULTI_TIMER_INV:
        pullData = (UNALIGNED ULONGLONG *)pData;
        pRawData->Data = *pullData;
        pRawData->Frequency = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfFreq.QuadPart;
        pRawData->Time = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfTime.QuadPart;

        //These counter types have a second counter value that is adjacent to
        //this counter value in the counter data block. The value is needed for
        //the calculation.
        if ((pCounter->CounterType & PERF_MULTI_COUNTER) == PERF_MULTI_COUNTER)
        {
            ++pullData;
            pRawData->MultiCounterData = *(DWORD*)pullData;
        }
        break;

    //These counters do not use any time reference.
    case PERF_COUNTER_RAWCOUNT:
    case PERF_COUNTER_RAWCOUNT_HEX:
    case PERF_COUNTER_DELTA:
        pRawData->Data = (ULONGLONG)(*(DWORD*)pData);
        pRawData->Time = 0;
        break;

    case PERF_COUNTER_LARGE_RAWCOUNT:
    case PERF_COUNTER_LARGE_RAWCOUNT_HEX:
    case PERF_COUNTER_LARGE_DELTA:
        pRawData->Data = *(UNALIGNED ULONGLONG*)pData;
        pRawData->Time = 0;
        break;
    
    //These counters use the 100ns time base in their calculation.
    case PERF_100NSEC_TIMER:
    case PERF_100NSEC_TIMER_INV:
    case PERF_100NSEC_MULTI_TIMER:
    case PERF_100NSEC_MULTI_TIMER_INV:
        pullData = (UNALIGNED ULONGLONG*)pData;
        pRawData->Data = *pullData;
        pRawData->Time = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfTime100nSec.QuadPart;

        //These counter types have a second counter value that is adjacent to
        //this counter value in the counter data block. The value is needed for
        //the calculation.
        if ((pCounter->CounterType & PERF_MULTI_COUNTER) == PERF_MULTI_COUNTER)
        {
            ++pullData;
            pRawData->MultiCounterData = *(DWORD*)pullData;
        }
        break;

    //These counters use two data points, this value and one from this counter's
    //base counter. The base counter should be the next counter in the object's 
    //list of counters.
    case PERF_SAMPLE_FRACTION:
    case PERF_RAW_FRACTION:
        pRawData->Data = (ULONGLONG)(*(DWORD*)pData);
        pBaseCounter = pCounter+1;  //Get base counter
        if ((pBaseCounter->CounterType & PERF_COUNTER_BASE) == PERF_COUNTER_BASE)
        {
            pData = (PVOID)((LPBYTE)pCounterDataBlock + pBaseCounter->CounterOffset);
            pRawData->Time = (LONGLONG)(*(DWORD*)pData);
        }
        else
        {
            fSuccess = FALSE;
        }
        break;

    case PERF_LARGE_RAW_FRACTION:
        pRawData->Data = *(UNALIGNED ULONGLONG*)pData;
        pBaseCounter = pCounter+1;
        if ((pBaseCounter->CounterType & PERF_COUNTER_BASE) == PERF_COUNTER_BASE)
        {
            pData = (PVOID)((LPBYTE)pCounterDataBlock + pBaseCounter->CounterOffset);
            pRawData->Time = *(LONGLONG*)pData;
        }
        else
        {
            fSuccess = FALSE;
        }
        break;

    case PERF_PRECISION_SYSTEM_TIMER:
    case PERF_PRECISION_100NS_TIMER:
    case PERF_PRECISION_OBJECT_TIMER:
        pRawData->Data = *(UNALIGNED ULONGLONG*)pData;
        pBaseCounter = pCounter+1;
        if ((pBaseCounter->CounterType & PERF_COUNTER_BASE) == PERF_COUNTER_BASE)
        {
            pData = (PVOID)((LPBYTE)pCounterDataBlock + pBaseCounter->CounterOffset);
            pRawData->Time = *(LONGLONG*)pData;
        }
        else
        {
            fSuccess = FALSE;
        }
        break;

    case PERF_AVERAGE_TIMER:
    case PERF_AVERAGE_BULK:
        pRawData->Data = *(UNALIGNED ULONGLONG*)pData;
        pBaseCounter = pCounter+1;
        if ((pBaseCounter->CounterType & PERF_COUNTER_BASE) == PERF_COUNTER_BASE)
        {
            pData = (PVOID)((LPBYTE)pCounterDataBlock + pBaseCounter->CounterOffset);
            pRawData->Time = *(DWORD*)pData;
        }
        else
        {
            fSuccess = FALSE;
        }

        if (pCounter->CounterType == PERF_AVERAGE_TIMER)
        {
            pRawData->Frequency = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->PerfFreq.QuadPart;
        }
        break;

    //These are base counters and are used in calculations for other counters.
    //This case should never be entered.
    case PERF_SAMPLE_BASE:
    case PERF_AVERAGE_BASE:
    case PERF_COUNTER_MULTI_BASE:
    case PERF_RAW_BASE:
    case PERF_LARGE_RAW_BASE:
        pRawData->Data = 0;
        pRawData->Time = 0;
        fSuccess = FALSE;
        break;

    case PERF_ELAPSED_TIME:
        pRawData->Data = *(UNALIGNED ULONGLONG*)pData;
        pRawData->Time = pObject->PerfTime.QuadPart;
        pRawData->Frequency = pObject->PerfFreq.QuadPart;
        break;

    //These counters are currently not supported.
    case PERF_COUNTER_TEXT:
    case PERF_COUNTER_NODATA:
    case PERF_COUNTER_HISTOGRAM_TYPE:
        pRawData->Data = 0;
        pRawData->Time = 0;
        fSuccess = FALSE;
        break;

    //Encountered an unidentified counter.
    default:
        pRawData->Data = 0;
        pRawData->Time = 0;
        fSuccess = FALSE;
        break;
    }

    return fSuccess;
}
次の方法で共有

カウンターデータの取得

フィードバック

その他のリソース

次の方法で共有

カウンター データの取得

フィードバック

その他のリソース

カウンターデータの取得
