PCW_MASK_INFORMATION structure (wdm.h)

The PCW_MASK_INFORMATION structure is the type of the EnumerateInstances and CollectData members of the _PCW_CALLBACK_INFORMATION union. It contains details of a notification sent by the system to a provider-defined PCW_CALLBACK function.

Syntax

typedef struct _PCW_MASK_INFORMATION {
  ULONG64          CounterMask;
  PCUNICODE_STRING InstanceMask;
  ULONG            InstanceId;
  BOOLEAN          CollectMultiple;
  PPCW_BUFFER      Buffer;
  PKEVENT          CancelEvent;
} PCW_MASK_INFORMATION, *PPCW_MASK_INFORMATION;

Members

CounterMask

A bitmask. If the x-th bit is set, the counter with ID x is included in the query.

InstanceMask

A Unicode string that contains a wildcard specification of instance names to be matched in the query. If all instance names should match the query, the InstanceMask field will be "*". Otherwise, "*" and "?" have the usual wildcard meaning of "zero-or-more-characters" and "any-character" respectively. Note that instance name matching is not case-sensitive.

InstanceId

The numeric value that identifies the ID of the instance(s) to be collected. If the value is PCW_ANY_INSTANCE_ID (0xFFFFFFFF), all instance IDs should match the query.

CollectMultiple

The BOOLEAN value that indicates whether the consumer will accept more than one instance in the results of the query. This will be FALSE if the counterset is being treated as a single-instance counterset. This will be TRUE if the counterset is being treated as a multi-instance counterset.

This value can be used to optimize data collection. If CollectMultiple is false then the data collection callback can return after adding one instance since additional instances will be ignored by the consumer.

Buffer

A handle to the system-managed buffer to which the instance(s) of the counterset will be added. This handle should be used when calling PcwAddInstance - or when calling the CTRPP-generated AddXxx function, which wraps the call to PcwAddInstance. For more info, see the Remarks of that page.

CancelEvent

If this field is non-NULL, it is an initialized event object that will be signaled if the request is canceled.

Requirements

Requirement	Value
Minimum supported client	Available in Windows 7 and later versions of Windows.
Header	wdm.h (include Wdm.h, Ntddk.h)

See also

PCW_CALLBACK callback function

_PCW_CALLBACK_INFORMATION structure