FltGetFilterInformation function

The FltGetFilterInformation routine provides information about a minifilter driver.

Syntax

NTSTATUS FLTAPI FltGetFilterInformation(
  PFLT_FILTER              Filter,
  FILTER_INFORMATION_CLASS InformationClass,
  PVOID                    Buffer,
  ULONG                    BufferSize,
  PULONG                   BytesReturned
);

Parameters

Filter

Opaque filter pointer for the caller.

InformationClass

Type of information requested. This parameter can have one of the following values.

Value Meaning
FilterFullInformation The buffer pointed to by the Buffer parameter receives a FILTER_FULL_INFORMATION structure for the minifilter driver.
FilterAggregateBasicInformation The buffer pointed to by the Buffer parameter receives a FILTER_AGGREGATE_BASIC_INFORMATION structure for the minifilter driver. This InformationClass value is available starting with Microsoft Windows Server 2003 SP1 and Windows XP SP2 with filter manager rollup. For more information on the filter manager rollup package for Windows XP SP2, see article 914882, " The filter manager rollup package for Windows XP SP2," in the Microsoft Knowledge Base.
FilterAggregateStandardInformation The buffer pointed to by the Buffer parameter receives a FILTER_AGGREGATE_STANDARD_INFORMATION structure for the minifilter driver. The LegacyFilter portion of the structure is not utilized. This InformationClass value is available starting with Windows Vista.

Buffer

Pointer to a caller-allocated buffer that receives the requested information. The type of the information returned in the buffer is defined by the InformationClass parameter.

BufferSize

Size, in bytes, of the buffer that the Buffer parameter points to. The caller should set this parameter according to the given InformationClass value.

BytesReturned

Pointer to a caller-allocated variable that receives the number of bytes returned in the buffer that Buffer points to. If the input value of BufferSize is too small, FltGetFilterInformation returns STATUS_BUFFER_TOO_SMALL and sets this variable to the number of bytes required to store the requested information. This parameter is required and cannot be NULL.

Return value

FltGetFilterInformation returns STATUS_SUCCESS or an appropriate NTSTATUS value, such as one of the following:

Return code Description
STATUS_BUFFER_TOO_SMALL
The buffer that the Buffer parameter points to is not large enough to store the requested information. This is an error code.
STATUS_INVALID_PARAMETER
An invalid value was specified for the InformationClass parameter. For example, if FilterAggregateStandardInformation is specified on an operating system prior to Windows Vista, the routine returns STATUS_INVALID_PARAMETER. This is an error code.

Requirements

   
Target Platform Universal
Header fltkernel.h (include FltKernel.h)
Library FltMgr.lib
DLL Fltmgr.sys
IRQL <= APC_LEVEL

See also

FILTER_AGGREGATE_BASIC_INFORMATION

FILTER_AGGREGATE_STANDARD_INFORMATION

FILTER_FULL_INFORMATION

FltEnumerateFilterInformation

FltEnumerateInstanceInformationByFilter

FltEnumerateInstanceInformationByVolume

FltGetInstanceInformation