Отображение имен объектов, экземпляров и счетчиков
Если вы хотите отобразить список объектов и их счетчиков в пользовательском интерфейсе, необходимо получить данные о производительности. Данные о производительности содержат переменное количество объектов производительности, а также их экземпляров и счетчиков. Сведения о формате данных о производительности см. в разделе Формат данных о производительности.
Данные о производительности не содержат имен объектов и счетчиков. Вместо этого данные содержат значения индекса, которые используются для получения имен объектов и счетчиков, которые хранятся в ресурсах, известных инфраструктуре счетчиков производительности. Однако имена экземпляров хранятся в данных о производительности. Пример, который считывает имена объектов и счетчиков из реестра и создает таблицу индексов для последующего доступа к именам, см. в разделе Извлечение имен счетчиков и текста справки.
В следующем примере показано, как получить блоки объекта, экземпляра и счетчика из данных о производительности. После получения имен объектов, имен экземпляров и счетчиков в примере объекты сортируются по имени, а для каждого объекта — его экземпляры и счетчики по имени. Затем в примере выводятся отсортированные списки.
#ifndef UNICODE
#define UNICODE
#endif
#include <windows.h>
#include <stdio.h>
#include <strsafe.h>
#pragma comment(lib, "advapi32.lib")
#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.
//Identifies a performance object and its counters and instances.
typedef struct _perf_object
{
DWORD dwObjectIndex; // Index to the name of the object.
LPDWORD pdwCounterIndexes; // Array of counter index values.
DWORD dwNumberOfCounters;
LPWSTR pInstanceNames; // Array of instance name strings.
DWORD dwNumberofInstances;
} PERF_OBJECT, *PPERF_OBJECT;
LPBYTE GetPerformanceData(LPWSTR pwszSource, DWORD dwInitialBufferSize);
BOOL GetCounterTextStrings(LPWSTR & pCounterTextHead, LPWSTR & pHelpTextHead, LPDWORD & pTextOffsets, DWORD* pdwNumberOfOffsets);
LPWSTR GetText(LPWSTR pwszSource);
BOOL BuildTextTable(LPWSTR pCounterHead, LPWSTR pHelpHead, LPDWORD* pOffsetsHead, LPDWORD pNumberOfOffsets);
DWORD GetNumberOfTextEntries(LPWSTR pwszSource);
PPERF_OBJECT LoadObjects(LPBYTE pObject, DWORD* dwNumberOfObjects, LPBYTE pEndObject);
BOOL LoadCounters(LPDWORD* ppdwCounterIndexes, LPBYTE pCounter, DWORD* pdwNumberOfCounters);
BOOL LoadInstances(LPWSTR* pInstanceNames, LPBYTE pInstance, DWORD dwNumberofInstances, DWORD CodePage);
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);
PERF_OBJECT_TYPE* GetObject(DWORD dwObjectToFind);
int CompareObjects(const void *pObject1, const void *pObject2);
int CompareCounters(const void *pCounter1, const void *pCounter2);
int CompareInstances(const void *pInstance1, const void *pInstance2);
void PrintObjectNames(DWORD dwNumberOfObjects, BOOL fIncludeCounters, BOOL fIncludeInstances);
void FreePerfObjects(PPERF_OBJECT pObjects, DWORD dwNumberOfObjects);
// Globals
LPBYTE g_pPerfDataHead = NULL; // Head of the performance data.
LPWSTR g_pCounterTextHead = NULL; // Head of the MULTI_SZ buffer that contains the Counter text.
LPWSTR g_pHelpTextHead = NULL; // Head of the MULTI_SZ buffer that contains the Help text.
LPDWORD g_pTextOffsets = NULL; // Array of DWORDS that contain the offsets to the text in
// pCounterTextHead and pHelpTextHead. The text index
// values mirror the array index.
PPERF_OBJECT g_pObjects = NULL; // Array of PERF_OBJECTs.
void wmain(void)
{
DWORD dwNumberOfOffsets = 0; // Number of elements in the pTextOffsets array.
DWORD dwNumberOfObjects = 0; // Number of elements in the pObjects array.
g_pPerfDataHead = (LPBYTE)GetPerformanceData(L"Global", INIT_GLOBAL_BUFFER_SIZE);
if (NULL == g_pPerfDataHead)
{
wprintf(L"GetPerformanceData failed.\n");
goto cleanup;
}
if (!GetCounterTextStrings(g_pCounterTextHead, g_pHelpTextHead, g_pTextOffsets, &dwNumberOfOffsets))
{
wprintf(L"GetCounterTextStrings failed.\n");
goto cleanup;
}
dwNumberOfObjects = ((PERF_DATA_BLOCK*)g_pPerfDataHead)->NumObjectTypes;
g_pObjects = LoadObjects(g_pPerfDataHead + ((PERF_DATA_BLOCK*)g_pPerfDataHead)->HeaderLength,
&dwNumberOfObjects,
g_pPerfDataHead + ((PERF_DATA_BLOCK*)g_pPerfDataHead)->TotalByteLength);
if (NULL == g_pObjects)
{
wprintf(L"LoadObjects failed.\n");
goto cleanup;
}
PrintObjectNames(dwNumberOfObjects, TRUE, TRUE);
cleanup:
if (g_pPerfDataHead)
free(g_pPerfDataHead);
if (g_pCounterTextHead)
free(g_pCounterTextHead);
if (g_pHelpTextHead)
free(g_pHelpTextHead);
if (g_pTextOffsets)
free(g_pTextOffsets);
if (g_pObjects)
FreePerfObjects(g_pObjects, dwNumberOfObjects);
}
//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;
}
BOOL GetCounterTextStrings(LPWSTR & pCounterTextHead, LPWSTR & pHelpTextHead, LPDWORD & pTextOffsets, DWORD* pdwNumberOfOffsets)
{
BOOL status = TRUE;
pCounterTextHead = GetText(L"Counter");
if (NULL == pCounterTextHead)
{
wprintf(L"GetText(L\"Counter\") failed.\n");
status = FALSE;
goto cleanup;
}
pHelpTextHead = GetText(L"Help");
if (NULL == pHelpTextHead)
{
wprintf(L"GetText(L\"Help\") failed.\n");
status = FALSE;
goto cleanup;
}
if (!BuildTextTable(pCounterTextHead, pHelpTextHead, &pTextOffsets, pdwNumberOfOffsets))
{
wprintf(L"BuildTextTable failed.\n");
status = FALSE;
}
cleanup:
return status;
}
// Get the text based on the source value. This function uses the
// HKEY_PERFORMANCE_NLSTEXT key to get the strings.
LPWSTR GetText(LPWSTR pwszSource)
{
LPWSTR pBuffer = NULL;
DWORD dwBufferSize = 0;
LONG status = ERROR_SUCCESS;
// Query the size of the text data so you can allocate the buffer.
status = RegQueryValueEx(HKEY_PERFORMANCE_NLSTEXT, pwszSource, NULL, NULL, NULL, &dwBufferSize);
if (ERROR_SUCCESS != status)
{
wprintf(L"RegQueryValueEx failed getting required buffer size. Error is 0x%x.\n", status);
goto cleanup;
}
// Allocate the text buffer and query the text.
pBuffer = (LPWSTR)malloc(dwBufferSize);
if (pBuffer)
{
status = RegQueryValueEx(HKEY_PERFORMANCE_NLSTEXT, pwszSource, NULL, NULL, (LPBYTE)pBuffer, &dwBufferSize);
if (ERROR_SUCCESS != status)
{
wprintf(L"RegQueryValueEx failed with 0x%x.\n", status);
free(pBuffer);
pBuffer = NULL;
goto cleanup;
}
}
else
{
wprintf(L"malloc failed to allocate memory.\n");
}
cleanup:
return pBuffer;
}
// Build a table of offsets into the counter and help text buffers. Use the index
// values from the performance data queries to access the offsets.
BOOL BuildTextTable(LPWSTR pCounterHead, LPWSTR pHelpHead, LPDWORD* pOffsetsHead, LPDWORD pNumberOfOffsets)
{
BOOL fSuccess = FALSE;
LPWSTR pwszCounterText = NULL; // Used to cycle through the Counter text
LPWSTR pwszHelpText = NULL; // Used to cycle through the Help text
LPDWORD pOffsets = NULL;
DWORD dwCounterIndex = 0; // Index value of the Counter text
DWORD dwHelpIndex = 0; // Index value of the Help text
DWORD dwSize = 0; // Size of the block of memory that holds the offset array
pwszCounterText = pCounterHead;
pwszHelpText = pHelpHead;
*pNumberOfOffsets = GetNumberOfTextEntries(L"Last Help");
if (0 == *pNumberOfOffsets)
{
wprintf(L"GetNumberOfTextEntries failed; returned 0 for number of entries.\n");
goto cleanup;
}
dwSize = sizeof(DWORD) * (*pNumberOfOffsets + 1); // Add one to make the array one-based
pOffsets = (LPDWORD)malloc(dwSize);
if (pOffsets)
{
ZeroMemory(pOffsets, dwSize);
*pOffsetsHead = pOffsets;
// Bypass first record (pair) of the counter data - contains upper bounds of system counter index.
pwszCounterText += (wcslen(pwszCounterText)+1);
pwszCounterText += (wcslen(pwszCounterText)+1);
for (; *pwszCounterText; pwszCounterText += (wcslen(pwszCounterText)+1))
{
dwCounterIndex = _wtoi(pwszCounterText);
dwHelpIndex = _wtoi(pwszHelpText);
// Use the counter's index value as an indexer into the pOffsets array.
// Store the offset to the counter text in the array element.
pwszCounterText += (wcslen(pwszCounterText)+1); //Skip past index value
pOffsets[dwCounterIndex] = (DWORD)(pwszCounterText - pCounterHead);
// Some help indexes for system counters do not have a matching counter, so loop
// until you find the matching help index or the index is greater than the corresponding
// counter index. For example, if the indexes were as follows, you would loop
// until the help index was 11.
//
// Counter index Help Index
// 2 3
// 4 5
// 6 7
// 9 (skip because there is no matching Counter index)
// 10 11
while (*pwszHelpText && dwHelpIndex < dwCounterIndex)
{
pwszHelpText += (wcslen(pwszHelpText)+1); // Skip past index value
pwszHelpText += (wcslen(pwszHelpText)+1); // Skip past help text to the next index value
dwHelpIndex = _wtoi(pwszHelpText);
}
// Use the Help index value as an indexer into the pOffsets array.
// Store the offset to the help text in the array element.
if (dwHelpIndex == (dwCounterIndex + 1))
{
pwszHelpText += (wcslen(pwszHelpText)+1); //Skip past index value
pOffsets[dwHelpIndex] = (DWORD)(pwszHelpText - pHelpHead);
pwszHelpText += (wcslen(pwszHelpText)+1); //Skip past help text to next index value
}
}
fSuccess = TRUE;
}
cleanup:
return fSuccess;
}
// Retrieve the last help index used from the registry. Use this number
// to allocate an array of DWORDs. Note that index values are not contiguous.
DWORD GetNumberOfTextEntries(LPWSTR pwszSource)
{
DWORD dwEntries = 0;
LONG status = ERROR_SUCCESS;
HKEY hkey = NULL;
DWORD dwSize = sizeof(DWORD);
LPWSTR pwszMessage = NULL;
status = RegOpenKeyEx(HKEY_LOCAL_MACHINE,
L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib",
0,
KEY_READ,
&hkey);
if (ERROR_SUCCESS != status)
{
wprintf(L"RegOpenKeyEx failed with 0x%x.\n", status);
goto cleanup;
}
status = RegQueryValueEx(hkey, pwszSource, NULL, 0, (LPBYTE)&dwEntries, &dwSize);
if (ERROR_SUCCESS != status)
{
wprintf(L"RegQueryValueEx failed with 0x%x.\n", status);
}
cleanup:
if (hkey)
RegCloseKey(hkey);
return dwEntries;
}
// Allocate a block of memory that will contain one or more PERF_OBJECT structures.
// For each object, also load its counters and instances.
PPERF_OBJECT LoadObjects(LPBYTE pPerfDataObject, DWORD* pdwNumberOfObjects, LPBYTE pEndObject)
{
BOOL fSuccess = FALSE;
DWORD dwSize = sizeof(PERF_OBJECT) * *pdwNumberOfObjects;
PPERF_OBJECT pObjects = NULL;
DWORD i = 0;
pObjects = (PERF_OBJECT*)malloc(dwSize);
if (NULL == pObjects)
{
wprintf(L"malloc failed to allocate memory for pObjects.\n");
goto cleanup;
}
ZeroMemory(pObjects, dwSize);
for (; i < *pdwNumberOfObjects; i++)
{
pObjects[i].dwObjectIndex = ((PERF_OBJECT_TYPE*)pPerfDataObject)->ObjectNameTitleIndex;
// Load Counter indexes.
pObjects[i].dwNumberOfCounters = ((PERF_OBJECT_TYPE*)pPerfDataObject)->NumCounters;
fSuccess = LoadCounters(&(pObjects[i].pdwCounterIndexes),
pPerfDataObject + ((PERF_OBJECT_TYPE*)pPerfDataObject)->HeaderLength, // Points to the first counter
&(pObjects[i].dwNumberOfCounters));
if (FALSE == fSuccess)
{
wprintf(L"LoadCounters failed.\n");
goto cleanup;
}
if ( ((PERF_OBJECT_TYPE*)pPerfDataObject)->NumInstances != 0 &&
((PERF_OBJECT_TYPE*)pPerfDataObject)->NumInstances != PERF_NO_INSTANCES )
{
// Load instance indexes.
pObjects[i].dwNumberofInstances = ((PERF_OBJECT_TYPE*)pPerfDataObject)->NumInstances;
fSuccess = LoadInstances(&(pObjects[i].pInstanceNames),
pPerfDataObject + ((PERF_OBJECT_TYPE*)pPerfDataObject)->DefinitionLength, // Points to the first instance
((PERF_OBJECT_TYPE*)pPerfDataObject)->NumInstances,
((PERF_OBJECT_TYPE*)pPerfDataObject)->CodePage);
if (FALSE == fSuccess)
{
wprintf(L"LoadInstances failed.\n");
goto cleanup;
}
}
pPerfDataObject += ((PERF_OBJECT_TYPE*)pPerfDataObject)->TotalByteLength;
if (pPerfDataObject >= pEndObject)
{
// The end of the counter objects array was reached.
break;
}
}
*pdwNumberOfObjects = i;
//After all the data is loaded, sort the list of objects, so you can print
//them in alphabetical order.
qsort(pObjects, *pdwNumberOfObjects, sizeof(PERF_OBJECT), CompareObjects);
cleanup:
if (FALSE == fSuccess)
{
FreePerfObjects(pObjects, i);
pObjects = NULL;
}
return pObjects;
}
// Allocate of block of memory and load the index values for the counters that
// the object defines.
BOOL LoadCounters(LPDWORD* ppdwIndexes, LPBYTE pCounter, DWORD* pdwNumberOfCounters)
{
BOOL fSuccess = FALSE;
DWORD dwSize = sizeof(DWORD) * *pdwNumberOfCounters;
LPDWORD pIndexes = NULL;
DWORD dwSkippedBaseRecords = 0;
pIndexes = (LPDWORD)malloc(dwSize);
if (NULL == pIndexes)
{
wprintf(L"malloc failed to allocate memory for pIndexes.\n");
goto cleanup;
}
ZeroMemory(pIndexes, dwSize);
for (DWORD i = 0, j = 0; i < *pdwNumberOfCounters; i++)
{
// Ignore base counters.
if ((((PERF_COUNTER_DEFINITION*)pCounter)->CounterType & PERF_COUNTER_BASE) == PERF_COUNTER_BASE)
{
dwSkippedBaseRecords++;
}
else
{
pIndexes[j] = ((PERF_COUNTER_DEFINITION*)pCounter)->CounterNameTitleIndex;
j++;
}
pCounter += ((PERF_COUNTER_DEFINITION*)pCounter)->ByteLength;
}
// Decrement so the sort works.
*pdwNumberOfCounters -= dwSkippedBaseRecords;
// Sort the index values of the object's counters.
qsort(pIndexes, *pdwNumberOfCounters, sizeof(DWORD), CompareCounters);
*ppdwIndexes = pIndexes;
fSuccess = TRUE;
cleanup:
return fSuccess;
}
// Allocate a block of memory and load the full instance name for each instance
// of the object.
BOOL LoadInstances(LPWSTR* ppNames, LPBYTE pInstance, DWORD dwNumberofInstances, DWORD CodePage)
{
BOOL fSuccess = FALSE;
DWORD dwSize = (sizeof(WCHAR) * (MAX_FULL_INSTANCE_NAME_LEN+1)) * dwNumberofInstances;
PERF_COUNTER_BLOCK* pCounter = NULL;
LPWSTR pName = NULL;
*ppNames = (LPWSTR)malloc(dwSize);
if (NULL == *ppNames)
{
wprintf(L"malloc failed to allocate memory for *ppNames.\n");
goto cleanup;
}
ZeroMemory(*ppNames, dwSize);
pName = *ppNames;
for (DWORD i = 0; i < dwNumberofInstances; i++)
{
fSuccess = GetFullInstanceName((PERF_INSTANCE_DEFINITION*)pInstance, CodePage, pName);
if (FALSE == fSuccess)
{
wprintf(L"GetFullInstanceName failed.\n");
goto cleanup;
}
pName = pName + (MAX_FULL_INSTANCE_NAME_LEN+1);
pCounter = (PERF_COUNTER_BLOCK*)(pInstance + ((PERF_INSTANCE_DEFINITION*)pInstance)->ByteLength);
pInstance += ((PERF_INSTANCE_DEFINITION*)pInstance)->ByteLength + pCounter->ByteLength;
}
// Sort the instance names of the object's instances.
qsort(*ppNames, dwNumberofInstances, sizeof(WCHAR) * (MAX_FULL_INSTANCE_NAME_LEN+1), CompareInstances);
cleanup:
return fSuccess;
}
// 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;
} else
{
// If the specified code page didn't work, try one more time, assuming that the input string is Unicode.
dwLength = (MAX_INSTANCE_NAME_LEN < (dwNameToConvertLen/2)) ? MAX_INSTANCE_NAME_LEN : dwNameToConvertLen/2;
if (SUCCEEDED(StringCchCopyN(pConvertedName, MAX_INSTANCE_NAME_LEN+1, (LPWSTR)pNameToConvert, dwLength)))
{
pConvertedName[dwLength] = '\0';
fSuccess = TRUE;
}
}
return fSuccess;
}
// Find the object using the specified index value.
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;
}
// 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;
}
// Used by qsort to put the object names in alphabetical order.
int CompareObjects(const void *pObject1, const void *pObject2)
{
DWORD index1 = ((PPERF_OBJECT)pObject1)->dwObjectIndex;
DWORD index2 = ((PPERF_OBJECT)pObject2)->dwObjectIndex;
LPWSTR pName1 = g_pCounterTextHead+g_pTextOffsets[index1];
LPWSTR pName2 = g_pCounterTextHead+g_pTextOffsets[index2];
DWORD dwName1Len = (DWORD)wcslen(pName1);
DWORD dwName2Len = (DWORD)wcslen(pName2);
return _wcsnicmp(pName1, pName2, (dwName1Len < dwName2Len) ? dwName1Len : dwName2Len);
}
// Used by qsort to put the counter names in alphabetical order.
int CompareCounters(const void *pCounter1, const void *pCounter2)
{
DWORD index1 = *(DWORD*)pCounter1;
DWORD index2 = *(DWORD*)pCounter2;
LPWSTR pName1 = g_pCounterTextHead+g_pTextOffsets[index1];
LPWSTR pName2 = g_pCounterTextHead+g_pTextOffsets[index2];
DWORD dwName1Len = (DWORD)wcslen(pName1);
DWORD dwName2Len = (DWORD)wcslen(pName2);
return _wcsnicmp(pName1, pName2, (dwName1Len < dwName2Len) ? dwName1Len : dwName2Len);
}
// Used by qsort to put the instance names in alphabetical order.
int CompareInstances(const void *pName1, const void *pName2)
{
return _wcsicmp((LPWSTR)pName1, (LPWSTR)pName2);
}
// Print the object names and optionally print their counter and instance names.
void PrintObjectNames(DWORD dwNumberOfObjects, BOOL fIncludeCounters, BOOL fIncludeInstances)
{
PERF_INSTANCE_DEFINITION* pInstance = NULL;
DWORD dwIncrementSize = sizeof(WCHAR) * (MAX_FULL_INSTANCE_NAME_LEN+1);
DWORD index = 0;
DWORD dwSerialNo = 0;
for (DWORD i = 0; i < dwNumberOfObjects; i++)
{
index = g_pObjects[i].dwObjectIndex;
wprintf(L"%d %s\n", index, g_pCounterTextHead+g_pTextOffsets[index]);
// There can be multiple instances with duplicate names. For example, the
// Process object can have multiple instance of svchost. To differentiate
// the instances, append a serial number to the name of duplicate instances
// If the object contained three svchost names, the function prints them
// as svchost, svchost#1, and svchost#2.
// If running on Windows 11 or later, you can avoid this issue by
// using the "Process V2" counterset.
if (fIncludeInstances && g_pObjects[i].dwNumberofInstances > 0)
{
dwSerialNo = 0;
for (DWORD j = 0; j < g_pObjects[i].dwNumberofInstances; j++)
{
if (j > 0)
{
if ( !CompareInstances( (void*)(g_pObjects[i].pInstanceNames + ((j-1) * (MAX_FULL_INSTANCE_NAME_LEN+1))),
(void*)(g_pObjects[i].pInstanceNames + (j * (MAX_FULL_INSTANCE_NAME_LEN+1))) ) )
{
dwSerialNo++;
}
else
{
dwSerialNo = 0;
}
}
if (dwSerialNo)
wprintf(L"\t%s#%d\n", g_pObjects[i].pInstanceNames + (j * (MAX_FULL_INSTANCE_NAME_LEN+1)), dwSerialNo);
else
wprintf(L"\t%s\n", g_pObjects[i].pInstanceNames + (j * (MAX_FULL_INSTANCE_NAME_LEN+1)));
}
wprintf(L"\n");
}
if (fIncludeCounters)
{
for (DWORD j = 0; j < g_pObjects[i].dwNumberOfCounters; j++)
{
index = g_pObjects[i].pdwCounterIndexes[j];
wprintf(L"\t%d %s\n", index, g_pCounterTextHead+g_pTextOffsets[index]);
}
wprintf(L"\n\n");
}
}
wprintf(L"\n\n");
}
void FreePerfObjects(PPERF_OBJECT pObjects, DWORD dwNumberOfObjects)
{
if (pObjects)
{
for (DWORD i=0; i < dwNumberOfObjects; i++)
{
if (pObjects[i].pInstanceNames)
{
free(pObjects[i].pInstanceNames);
}
if (pObjects[i].pdwCounterIndexes)
{
free(pObjects[i].pdwCounterIndexes);
}
}
free(pObjects);
pObjects = NULL;
}
}