// ks.h

typedef struct {
  ULONG PropertyId;
  union {
    PFNKSFASTHANDLER GetPropertyHandler;
    BOOLEAN          GetSupported;
  };
  union {
    PFNKSFASTHANDLER SetPropertyHandler;
    BOOLEAN          SetSupported;
  };
  ULONG Reserved;
} KSFASTPROPERTY_ITEM, *PKSFASTPROPERTY_ITEM;
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Windows Driver Kit DDI reference (ns-ks-ksfastproperty_item)

KSFASTPROPERTY_ITEM structure

Description

The KSFASTPROPERTY_ITEM structure is used with items for fast I/O dispatching.

Members

`PropertyId`

Specifies the identifier of the specific property within the set.

`GetPropertyHandler`

Points to a driver-supplied KStrFastHandler routine that specifies the fast handler for retrieving the property. If this is NULL, the property cannot be read with a fast handler.

`GetSupported`

A boolean value that indicates if the driver has supplied a get property handler.

`SetPropertyHandler`

Points to a driver-supplied KStrFastHandler routine that specifies the fast handler for setting the property. If this is NULL, the property cannot be set with a fast handler.

`SetSupported`

A boolean value that indicates if the driver has supplied a set property handler.

`Reserved`

Reserved and set to zero.

KSFASTPROPERTY_ITEM - NtDoc