enum IFilterReturnCodes : uint {

        /// Unable to bind IFilter for embedded object

        /// Unable to bind IFilter for linked object

#Region "IFilterReturnCodes Enumeration Definition"

    Public Enum IFilterReturnCodes

enum IFILTER_FLAGS {

   /// enumerators should not be returned from IFilter.

   IFILTER_FLAGS_OLE_PROPERTIES = 1

#Region "IFILTER_FLAGS Enumeration Definition"

   Public Enum IFILTER_FLAGS

     '// available through COM enumerators should not be returned from IFilter.

     IFILTER_FLAGS_OLE_PROPERTIES = 1

public enum IFILTER_INIT

   IFILTER_INIT_CANON_PARAGRAPHS = 1,

   IFILTER_INIT_HARD_LINE_BREAKS = 2,

   IFILTER_INIT_CANON_HYPHENS = 4,

   /// Just as the IFILTER_INIT_CANON_HYPHENS flag standardizes hyphens,

   IFILTER_INIT_CANON_SPACES = 8,

   IFILTER_INIT_APPLY_INDEX_ATTRIBUTES = 16,

   IFILTER_INIT_APPLY_CRAWL_ATTRIBUTES = 256,

   /// Any properties not covered by the IFILTER_INIT_APPLY_INDEX_ATTRIBUTES

   /// and IFILTER_INIT_APPLY_CRAWL_ATTRIBUTES flags should be emitted.

   IFILTER_INIT_APPLY_OTHER_ATTRIBUTES = 32,

   /// Optimizes IFilter for indexing because the client calls the

   /// IFilter::Init method only once and does not call IFilter::BindRegion.

   IFILTER_INIT_INDEXING_ONLY = 64,

   /// IFilter::GetChunk call that would have obtained the first chunk of the

   IFILTER_INIT_SEARCH_LINKS = 128,

   IFILTER_INIT_FILTER_OWNED_VALUE_OK = 512

#Region "IFILTER_INIT Enumeration Definition"

  Public Enum IFILTER_INIT

    IFILTER_INIT_CANON_PARAGRAPHS = 1

    IFILTER_INIT_HARD_LINE_BREAKS = 2

    IFILTER_INIT_CANON_HYPHENS = 4

    '  Just as the IFILTER_INIT_CANON_HYPHENS flag standardizes hyphens

    IFILTER_INIT_CANON_SPACES = 8

    IFILTER_INIT_APPLY_INDEX_ATTRIBUTES = 16

    IFILTER_INIT_APPLY_CRAWL_ATTRIBUTES = 256

    '   Any properties not covered by the IFILTER_INIT_APPLY_INDEX_ATTRIBUTES

    '   and IFILTER_INIT_APPLY_CRAWL_ATTRIBUTES flags should be emitted.

    IFILTER_INIT_APPLY_OTHER_ATTRIBUTES = 32

    '   Optimizes IFilter for indexing because the client calls the

    '   IFilter::Init method only once and does not call IFilter::BindRegion.

    IFILTER_INIT_INDEXING_ONLY = 64

    '   IFilter::GetChunk call that would have obtained the first chunk of the

    IFILTER_INIT_SEARCH_LINKS = 128

    IFILTER_INIT_FILTER_OWNED_VALUE_OK = 512

  '''   structure is used by the IFilter::BindRegion method.

To receive messages from a kernel-mode minifilter, a user-mode application typically defines a custom message structure. This structure typically consists of this header structure, followed by an application-defined structure to hold the actual message data.

This structure is allocated by a user-mode application. It is a container for a reply that the application sends in response to a message received from a kernel-mode minifilter or minifilter instance.

        /// current instance of the IFilter interface.

        /// IFilter::GetText should be used to retrieve the contents of the chunk

        /// If the CHUNK_VALUE flag is set, IFilter::GetValue should be used to retrieve

interface IFilter

   /// The IFilter::Init method initializes a filtering session.

   IFilterReturnCodes Init(

     //[in] Flag settings from the IFILTER_INIT enumeration for

     // scope, and IFilter access patterns.

     IFILTER_INIT grfFlags,

     //  caller; from the IFILTER_FLAGS enumeration.

     out IFILTER_FLAGS pdwFlags);

   /// The IFilter::GetChunk method positions the filter at the beginning

   IFilterReturnCodes GetChunk(out STAT_CHUNK pStat);

   /// The IFilter::GetText method retrieves text (text-type properties)

   IFilterReturnCodes GetText(

   /// The IFilter::GetValue method retrieves a value (public

   IFilterReturnCodes GetValue(

   /// The IFilter::BindRegion method retrieves an interface representing

   IFilterReturnCodes BindRegion(ref FILTERREGION origPos,

Public Interface IFilter

      '''   The IFilter::Init method initializes a filtering session.

        ByVal grfFlags As IFILTER_INIT, _

        ByVal pdwFlags As IFILTER_FLAGS _

        ) As IFilterReturnCodes

        ' <in> grfFlags - Flag settings from the IFILTER_INIT enumeration for

        ' scope, and IFilter access patterns.

        '  caller; from the IFILTER_FLAGS enumeration.

     '''    The IFilter::GetChunk method positions the filter at the beginning

            ) As IFilterReturnCodes

     '''   The IFilter::GetText method retrieves text (text-type properties)

      ) As IFilterReturnCodes

     '''   The IFilter::GetValue method retrieves a value (public

            ) As IFilterReturnCodes

     '''   The IFilter::BindRegion method retrieves an interface representing

              ) As IFilterReturnCodes

IFILTER_FLAGS, IFILTER_INIT, FULLPROPSPEC, IFilterReturnCodes, STAT_CHUNK, FILTERREGION

static extern int LoadIFilter(string pwcsPath,

          ref IFilter ppIUnk);

Declare Unicode Function LoadIFilter Lib "query.dll" (ByVal pwcsPath As String, _

                               ByRef ppIUnk As IFilter) As Integer