File Content Extraction 25.4
Filter SDK C Programming Guide

# fpGetExtractInterface()

Call this function to obtain the file extraction functions. When you call this function, it assigns the function pointers in the `KVExtractInterface` structure so that you can use the functions described in File Extraction API Functions.

## Syntax

    KVErrorCode (pascal* fpGetExtractInterface)(
            KVFilterSession session,
            KVExtractInterface pExtractInterface);

## Arguments

`session` | A Filter session that you initialized by calling fpInit().
`pExtractInterface` | A KVExtractInterface structure. Before you initialize the `KVExtractInterface` structure, use the macro `KVStructInit` to initialize the `KVStructHead` structure.

## Returns

- If the call is successful, the return value is `KVError_Success`.
- If the call is not successful, the return value is an error code that indicates the problem.

## Lifetimes and Memory Management

Destroy the `KVFilterSession` only after you no longer need to call the extraction functions.

## Discussion

- You can get only one extraction interface for each Filter session.

- The `KVFilterSession` that you pass in must be the same `KVFilterSession` that you pass into the File Extraction API functions returned in KVExtractInterface.

## Example

    KVStructInit(&extractInterface);
    error = filterInterface->fpGetExtractInterface(session, &extractInterface);

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Version 25.4 | Last updated October 2025

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Product: File Content Extraction 25.4

Topic Title: fpGetExtractInterface()