File Content Extraction 25.4
Filter SDK C Programming Guide

# fpOpenFileFromFilterSession()

This function opens a container file so that you can extract its subfiles.

## Syntax

    KVErrorCode (pascal *fpOpenFileFromFilterSession)(
        KVFilterSession session,
        KVOpenFileArg openArg,
        void** pFile
    );

## Arguments

`session` | A Filter session that you initialized by calling fpInit().
`openArg` | A KVOpenFileArg, which contains the parameters necessary to open a file for extraction. Before you initialize the `KVOpenFileArg` structure, use the macro `KVStructInit` to initialize the `KVStructHead` structure.
`pFile` | A handle for the opened file. Use this handle in subsequent file extraction calls to identify the source file.

## Returns

- If the file is opened successfully, the return value is `KVERR_Success`.
- If the file is not opened, the return value is an error code and `pFile` points to `NULL`.

## Lifetime and Memory Management

After you have finished extracting the file, call fpCloseFile() to free the memory allocated by this function. Call fpCloseFile() only when `fpOpenFileFromFilterSession()` returns `KVError_Success`.

When extracting out-of-process in stream mode, you can only open one container at a time (per `session`).

## Example

    KVOpenFileArgRec openArg;

    // Initialize the structure using KVStructInit
    KVStructInit(&openArg);

    openArg.extractDir = destDir;
    openArg.document = pDocument;

    /*Open the main file */
    if (error = extractInterface->fpOpenFileFromFilterSession(session, &openArg, &pFile))
    {
        extractInterface->fpCloseFile(pFile);
        pFile = NULL;
    }

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Version 25.4 | Last updated October 2025

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Product: File Content Extraction 25.4

Topic Title: fpOpenFileFromFilterSession()