File Content Extraction 26.2
Filter SDK C Programming Guide

# KVMainFileInfo

This structure contains information about a main file that is open for extraction. It is initialized by calling fpGetMainFileInfo(). This structure is defined in `kvxtract.h`.

    typedef struct  tag_KVMainFileInfo
    {
        KVStructHeader;
        int             numSubFiles;
        ADDOCINFO       docInfo;
        KVCharSet       charset;
        int             isMSBLSB;
        unsigned long   infoFlag;
    }
    KVMainFileInfoRec, *KVMainFileInfo;

## Member Descriptions

`KVStructHeader` | The version of the structure. See KVStructHead.
`numSubFiles` | The number of subfiles in the main file.
`docInfo` | The file’s major format (such as Microsoft Word or Corel Presentation), as defined by the structure `ADDOCINFO`. See ADDOCINFO.
`charset` | The character set of the main file.
`isMSBLSB` | This flag indicates whether the byte order for Unicode text is Big Endian (MSBLSB) or Little Endian (LSBMSB).
`infoFlag` | A bitwise flag that provides additional information about the main file. The following flag is available: `KVMainFileInfoFlag_HasContent`—The main file contains text that can be filtered. Below are some examples of how this flag is used: For an MSG file without attachments, `numSubFiles` is `1` (message body text), and this flag is `FALSE` because the MSG file itself does not contain text. For a Zip file with three files, `numSubFiles` is `3`, and this flag is `FALSE` because a Zip file does not contain text. For a Microsoft Word file with an embedded OLE object, `numSubFiles` is `1` (OLE object), and this flag is `TRUE` (Word file contains text to be filtered).

## Discussion

- If `numSubFiles` is non-zero, get information on the subfile by calling fpGetSubFileInfo(), and then extract the subfiles by using fpExtractSubFile().

- If `numSubFiles` is `0`, the file does not contain subfiles and does not need to be extracted further. If the `KVMainInfoFlag_HasContent` flag is set, the file contains body text and can be passed directly to the filtering functions. See Filter API Functions.

- If `openFlag` is set to `KVOpenFileFlag_CreateRootNode` in the call to `fpOpenFile()`, `numSubFiles` also includes the root object (index `0`) which is created by File Content Extraction for reconstructing the file’s hierarchy. See KVOpenFileArg.

Copyright 1997-2026 Open Text
Version 26.2 | Last updated April 2026

Send documentation feedback

Close

Send documentation feedback

To send feedback using your default email client, open an email window.

Otherwise, send your feedback and the information below to MFI-swpdl.idoldocsfeedback@opentext.com.

We appreciate your feedback!

Product: File Content Extraction 26.2

Topic Title: KVMainFileInfo