PERF_DATA_BLOCK

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This structure describes the performance data provided by the 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 {
  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 structures. This member is greater than or equal to one.
  • Revision
    Contains the revision of the performance 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 Universal Time Coordinate (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.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: Windows.h.

See Also

Performance Monitoring Structures

 Last updated on Friday, October 08, 2004

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