File Content Extraction 26.1
Filter SDK C Programming Guide

# Reader Interface

All custom readers use the reader interface defined in `kvcfsr.h`. The members of this structure are:

    fpAllocateContext()
    fpInitDoc()
    fpFillBuffer()
    fpFreeContext()
    fpHotSpothit()
    fpGetSummaryInfo()
    fpOpenStream()
    fpCloseStream()
    fpGetURL()
    fpGetCharSet()

NOTE: `fpHotSpothit()` and `fpGetURL()` are currently reserved and must be `NULL`.

## Function Flow

The structured access layer calls the functions as follows:

1. `fpAllocateContext()` is called and returns a pointer to the global context structure.
2. After further processing within the structured access layer, `fpInitDoc()` is called. This function performs all required initialization for the global context structure and then returns control to the structured access layer.
3. After further processing within the structured access layer, the `fpFillBuffer()` function is called repeatedly until the document is completely parsed.
4. Finally, `fpFreeContext()` is called. This function frees all memory allocated within the custom reader and then returns control to the structured access layer.

Related Topics

- Functions

Copyright 1997-2025 Open Text
Version 26.1 | Last updated January 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 26.1

Topic Title: Reader Interface