// ks.h

typedef struct {
  ULONG MethodId;
  union {
    PFNKSFASTHANDLER MethodHandler;
    BOOLEAN          MethodSupported;
  };
} KSFASTMETHOD_ITEM, *PKSFASTMETHOD_ITEM;
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Windows Driver Kit DDI reference (ns-ks-ksfastmethod_item)

KSFASTMETHOD_ITEM structure

Description

Drivers provide a structure of type KSFASTMETHOD_ITEM to support fast I/O dispatching.

Members

`MethodId`

Contains the identifier of the method and the flags describing the type of method.

`MethodHandler`

Points to a driver-supplied KStrFastHandler routine for this method.

`MethodSupported`

Set to TRUE if the method is supported, otherwise set to FALSE.

KSFASTMETHOD_ITEM - NtDoc