File Content Extraction 25.4
Filter SDK C Programming Guide

# fpFilterConfig()

DEPRECATED: The `fpFilterConfig()` function is deprecated in KeyView version 23.2 and later. Use fpSetConfig() instead.

This function provides a way to enable and configure various options prior to document filtering, such as providing a password for a file, or enabling hidden text extraction.

## Syntax

    BOOL pascal fpFilterConfig(
        KVFilterSession   session,
        int               nType,
        int               nValue,
        void             *pData );

## Arguments

`session` | A Filter session that you initialized by calling fpInit().
`nType` | The configuration flag. This is a symbolic constant defined in `kvtypes.h`. The available options are described in the Filter Configuration Flags table.
`nValue` | The integer value defined for the flags above.
`pData` | The data for the configuration flag.

## Returns

- If the call is successful, the return value is `TRUE`.
- If the call is unsuccessful, the return value is `FALSE`.

## Discussion

- You must call this function after the call to fpInit() and before the call to fpFilterStream() or fpFilterFile().
- `fpFilterConfig()` sets configuration in-process, and in the out-of-process session.
- The configuration flags are described in the following table.

Filter Configuration Flags

Flag | Description
--- | ---
`KVFLT_SETOOPSRCFILE` | IMPORTANT: This flag applies only when you use the legacy out-of-process method. See Use the Legacy Out-of-Process Method. If you set this flag to `TRUE`, the input file name is reported in the out-of-process error log when the file generates an error in stream mode. See Report the File Name in Stream Mode. The default is `FALSE`. `nValue` is `TRUE` or `FALSE`. `pData` is the name of the input file generating errors.
`KVFLT_OOPERRORLOG` | IMPORTANT: This flag applies only when you use the legacy out-of-process method. See Use the Legacy Out-of-Process Method. Set this flag to `TRUE` to enable out-of-process error logging. See Generate a Legacy Out-of-Process Error Log. The default is `FALSE`. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SETTEMPDIRECTORY` | This flag enables you to specify the directory where temporary files created during filtering processes are stored. `nValue` is set to `0`. `pData` is the path name of the directory where temporary files are stored. This value must be null terminated. On Windows, `pData` must be in the local Windows code page.
`KVFLT_SETXMLCONFIGINFO` | This flag enables you to define which elements and attributes are extracted from XML documents with a specified format ID or root element. You can use this option to override the default settings for the supported XML formats (see Filter XML Files), or to define settings for custom XML document types. The settings are defined in the KVXConfigInfo structure. To set custom settings for more than one document type, call the `fpSetConfig()` function once for each type. `nValue` is set to `0`. `pData` is a pointer to the KVXConfigInfo structure.
`KVFLT_SETSRCPASSWORD` | This flag enables you to define a password used to open a password-protected file for filtering. See Filter Password Protected Files. `nValue` is the length of the password. `pData` is the source file password, which can have a maximum length of 255 characters. To remove the configured password, set `KVFLT_SETSRCPASSWORD` and pass in `nValue=0` and `pData=NULL`.
`KVFLT_LOGICALPDF` | This flag extracts paragraphs from a PDF file in the order in which they appear on the page (logical reading order). The `nValue` argument specifies the paragraph direction. See Filter PDF Files. `nValue` is one of the paragraph direction options defined in the LPDF_DIRECTION enumerated type in `kvtypes.h`. `pData` is `NULL`.
`KVFLT_INCLREVISIONMARK` | If you set this flag to `TRUE`, text that was deleted from a document with revision tracking enabled is extracted from the document and included in the filtered output. To reset the flag and exclude deleted text from the filtered output, set the flag to `FALSE` (the default). See Deleted Text. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_NOEMBEDDEDOBJECT` | If you set this flag to `TRUE`, the text of embedded previews in Microsoft Word (DOC, DOCX), Excel (XLSX), PowerPoint (PPT, PPTX), and Visio (VSDX) documents is not included in the filter output. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SHOWHIDDENTEXT` | If you set this flag to `TRUE`, hidden text is extracted from Microsoft Word, Excel, and PowerPoint documents. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_NOCOMMENTS` | If you set this flag to `TRUE`, comments and annotations are not extracted. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SHOWDATEFIELDCODE` | If you set this flag to `TRUE`, date/time field codes are extracted from Microsoft Word, PowerPoint, and Rich Text Format documents instead of the date/time values. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SKIPEMBEDDEDFONT` | If you set this flag to `TRUE`, text that contains embedded fonts is not filtered from PDF documents. See Embedded Fonts - PDF. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SHOWFILENAMEFIELDCODE` | If you set this flag to `TRUE`, file name field codes are extracted from Microsoft Word documents. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_KEEPSOFTHYPHEN` | If you set this flag to `TRUE`, soft hyphens are retained when text is filtered from PDF documents. See Control Hyphenation. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SetConfigurableArguments` | DEPRECATED: This option has been deprecated in File Content Extraction version 24.4. Use the `KVFLT_SHOWHIDDENTEXT` and `KVFLT_SHOWFORMULAS` options instead. The `KVFLT_SetConfigurableArguments` option is still available, but might be removed in a future release. This is used to configure hidden information for Microsoft Excel files. See Hidden Data in Microsoft Excel Documents. If you set this flag to `TRUE`, the `pData` is a variable of configurable arguments. `nValue` is `TRUE` or `FALSE`. `pData` is a variable of configurable arguments.
`KVFLT_EXPORTALLMETADATA` | If you set this flag to `TRUE`, all custom metadata is filtered from PDF documents when the metadata APIs are used. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_EXPORTTAGGEDCONTENT` | If you set this flag to `TRUE`, tagged PDF content is filtered from PDF documents. See Tagged Content - PDF. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_FILTERLOGICALORDER` | If you set this flag to `TRUE`, the text filtered from Microsoft PowerPoint files is output in logical (reading) order. See Filter Presentation Files to a Logical Reading Order. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SETOUTPUTCHARSET` | This flag enables the output character set to be changed. `pData` is one of the character encodings defined in the `KVCharSet` enumerated type in `kvcharset.h`.
`KVFLT_EXTRACTIMAGES` | If you set this flag to `TRUE`, the extract API also extracts images contained within the file. See Extract Images for more details. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_STANDARDIZECELLFORMATS` | If you set this flag to `TRUE`, standardization of cell formats in Microsoft Excel files is enabled. See Standardize Cell Formats. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_TABLEDETECTION` | If you set this flag to `TRUE`, table detection for PDF files is enabled. See Table Detection for PDF Files. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_TABDELIMITED` | If you set this flag to `TRUE`, tables in spreadsheets and word processing formats are output in tab delimited formats. This format includes tab delimiters for all cells, including empty cells. For more information, see Tab Delimited Output for Spreadsheets and Embedded Tables. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_OUTPUTTABLEDELIMITERS` | If you set this flag to `TRUE`, table delimiters are enabled for Named Entity Recognition (See Tab Delimited Output for Spreadsheets and Embedded Tables). Values are `TRUE`and `FALSE`, `pData` is `NULL`.
`KVFLT_NOPHONETICGUIDES` | If you set this flag to `TRUE`, File Content Extraction does not output Japanese phonetic guide text from Microsoft Excel files. See Japanese Guide Text - Microsoft Excel. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.
`KVFLT_SOURCECODEDETECTION` | If you enable this option, File Content Extraction attempts to identify the programming language of any source code files that it finds. The `nValue` argument specifies the level of identification to attempt. See Source Code Identification. `nValue` is `KVSOURCECODE_OFF`, `KVSOURCECODE_ENABLED`, or `KVSOURCECODE_EXTENDED`. `pData` is `NULL`.
`KVFLT_CHARSETDETECTION` | File Content Extraction attempts to detect the character set of an input file. Some character sets (including ANSI, UTF-8, and UTF-16) can be detected by core functionality but others can only be detected if your license includes advanced character set detection. If your license includes advanced character set detection, it is enabled by default. However, it can increase the time required to filter some documents. To disable advanced character set detection, set this flag to `FALSE`. File Content Extraction cannot perform character set conversion unless it detects the character set of the source file, or you call fpSetSrcCharSet(). For more information see Character Encoding.
`KVFLT_OCR` | File Content Extraction performs Optical Character Recognition (OCR) on raster image files, to attempt to filter text that might be visible in the image. OCR is available only on certain platforms (see Optical Character Recognition in the platform differences section). If your license includes OCR, it is enabled by default. To disable OCR set `nValue` to `FALSE` and `pData` to `NULL`, and to re-enable it set `nValue` to `TRUE` and `pData` to `NULL`. File Content Extraction can perform OCR on a wide range of documents. If you know in advance what you will be processing (for example, if you know that the text in all of your documents is in English) you can specify OCR options to improve performance. To do this, set `nValue` to `TRUE`, and `pData` to a pointer to the KVOcrOptions structure. For more information, see Optimize OCR Performance.
`KVFLT_SETOOPUSERWIN` | You can use this flag to run the out-of-process server as a specific user, so that you can run the out-of-process server with different privileges to your main application. See Run Filter with Minimal Privileges. This flag can be used only on Windows, see `KVFLT_SETOOPUSERUNIX` to specify the user for the out-of-process server on non-Windows platforms. To enable this option, set `nValue` to `TRUE` and `pData` to a pointer to a KV_SET_OOP_USER structure, which must have been initialized with `KVStructInit` and cannot be `NULL`. To disable this option, set `nValue` to `FALSE` and `pData` to `NULL`.
`KVFLT_SETOOPUSERUNIX` | You can use this flag to run the out-of-process server with a specific user and group ID, so that you can run the out-of-process server with different privileges to your main application. See Run Filter with Minimal Privileges. This flag can be used only on non-Windows platforms, see `KVFLT_SETOOPUSERWIN` to specify the user for the out-of-process server on Windows. `nValue` is `FALSE`. `pData` is a pointer to a KV_SET_OOP_USER structure, which must have been initialized with `KVStructInit` and cannot be `NULL`.
`KVFLT_FILTERPIPESTREAMING` | IMPORTANT: This flag applies only when you use the legacy out-of-process method. See Use the Legacy Out-of-Process Method. If you set this flag to `TRUE`, it enables pipe-streaming mode for filtering. See Configure Legacy Pipe-Streaming. This change does not take effect until the next time `fpOpenStream` is called. It does not affect any `fpFilterStream` calls on streams that are already open. Values are `TRUE` and `FALSE`, `pData` is `NULL`.
`KVFLT_EXTRACTPIPESTREAMING` | IMPORTANT: This flag applies only when you use the legacy out-of-process method. See Use the Legacy Out-of-Process Method. If you set this flag to `TRUE`, it enables pipe-streaming mode for extraction (see Configure Legacy Pipe-Streaming). This change does not take effect until the next time `fpOpenFile` is called. Any file that is already open when you change the setting uses the pre-existing setting. Values are `TRUE` and `FALSE`, `pData` is `NULL`.
`KVFLT_UNEXPECTEDZIPDETECTION` | If you set this flag to `TRUE`, `fpMainFileInfo()` returns an error if it detects a ZIP file that has been concatenated onto the end of the file in an attempt to hide it. For more information, see Unexpected ZIP Detection. Values are `TRUE` and `FALSE`, `pData` is `NULL`.
`KVFLT_SHOWFORMULAS` | This flag configures how File Content Extraction outputs formulas and calculated values in spreadsheets. `nValue` is one of the options defined in the `KV_SHOW_FORMULAS_AS` enumerated type in `kvtypes.h`. `pData` is `NULL`
`KVFLT_HEADERFOOTER` | If you set this flag to `TRUE`, File Content Extraction includes headers and footers in filter output. The default is `FALSE`. `nValue` is `TRUE` or `FALSE`. `pData` is `NULL`.

## Examples

- To specify a password to open a password-protected file for filtering:

      (*fpFilterConfig)(pKVFilter, KVFLT_SETSRCPASSWORD, 8, "password");

- To extract hidden text from Microsoft Word, Excel, or PowerPoint files:

      (*fpFilterConfig)(pKVFilter, KVFLT_SHOWHIDDENTEXT, TRUE, NULL);

- To extract all custom metadata fields from PDF documents:

      (*fpFilterConfig)(pKVFilter, KVFLT_EXPORTALLMETADATA, TRUE, NULL);

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Version 25.4 | Last updated October 2025

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Product: File Content Extraction 25.4

Topic Title: fpFilterConfig()