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
Signature
Contains the
Unicode string PERF.
LittleEndian
Contains zero
if the processor is big endian and one if it is little endian.
Version
Contains the
version of the performance (PERF_) structures. This member is greater
than or equal to one.
Revision
Contains the
revision of the performance (PERF_) structures. This member is greater
than or equal to zero.
TotalByteLength
Contains the
total length, in bytes, of the performance data.
HeaderLength
Contains the
length, in bytes, of this structure.
NumObjectTypes
Contains the
number of object types being monitored.
DefaultObject
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.
SystemTime
Contains the
time when the system is monitored. This member is in Coordinated Universal Time
(UTC) format.
PerfTime
Contains the
performance-counter value, in counts, for the system being monitored.
PerfFreq
Contains the
performance-counter frequency, in counts per second, for the system being
monitored.
PerfTime100nSec
Contains the
performance-counter value, in 100 nanosecond units, for the system being
monitored.
SystemNameLength
Contains the
length, in bytes, of the system name.
SystemNameOffset
Contains the
offset from the beginning of this structure to the name of the system being monitored.
See Also