PERF_DATA_BLOCK
The PERF_DATA_BLOCK structure describes the performance data provided by RegQueryValueEx function. The data starts with a PERF_DATA_BLOCK structure and is followed by a PERF_OBJECT_TYPE structure and other object-specific data for each type of object monitored.
typedef struct _PERF_DATA_BLOCK { // pdb
WCHAR Signature[4];
DWORD LittleEndian;
DWORD Version;
DWORD Revision;
DWORD TotalByteLength;
DWORD HeaderLength;
DWORD NumObjectTypes;
DWORD DefaultObject;
SYSTEMTIME SystemTime;
LARGE_INTEGER PerfTime;
LARGE_INTEGER PerfFreq;
LARGE_INTEGER PerfTime100nSec;
DWORD SystemNameLength;
DWORD SystemNameOffset;
} PERF_DATA_BLOCK;
Members
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Signature
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Contains the Unicode string PERF.
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LittleEndian
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Contains zero if the processor is big endian and one if it is little endian.
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Version
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Contains the version of the performance (PERF_) structures. This member is greater than or equal to one.
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Revision
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Contains the revision of the performance (PERF_) structures. This member is greater than or equal to zero.
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TotalByteLength
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Contains the total length, in bytes, of the performance data.
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HeaderLength
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Contains the length, in bytes, of this structure.
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NumObjectTypes
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Contains the number of object types being monitored.
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DefaultObject
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Contains the object title index of the default object whose performance data is to be displayed. This member can be –1 to indicate that no data is to be displayed.
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SystemTime
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Contains the time when the system is monitored. This member is in Coordinated Universal Time (UTC) format.
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PerfTime
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Contains the performance-counter value, in counts, for the system being monitored.
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PerfFreq
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Contains the performance-counter frequency, in counts per second, for the system being monitored.
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PerfTime100nSec
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Contains the performance-counter value, in 100 nanosecond units, for the system being monitored.
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SystemNameLength
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Contains the length, in bytes, of the system name.
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SystemNameOffset
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Contains the offset from the beginning of this structure to the name of the system being monitored.
QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Unsupported.
Windows CE: Unsupported.
Header: Declared in winperf.h.
See Also
Performance Data Helper Overview, Performance Data Structures, PERF_OBJECT_TYPE, RegQueryValueEx