File Content Extraction 26.1
Filter SDK C Programming Guide

# fpFreeStruct()

This function frees the memory allocated by fpGetMainFileInfo(), fpGetSubFileInfo(), fpGetSubFileMetaData(), and fpExtractSubFile().

## Syntax

    int (pascal *fpFreeStruct) (
        void      *pFile,
        void      *obj);

## Arguments

`pFile` | The identifier of the file. This is a file handle returned from fpOpenFile() or fpOpenFileFromFilterSession().
`obj` | A KVMainFileInfo, KVSubFileInfo, KVSubFileMetaData or KVSubFileExtractInfo obtained through a call to fpGetMainFileInfo(), fpGetSubFileInfo(), fpGetSubFileMetaData(), fpExtractSubFile(), or fpGetExtractInfo().

## Returns

- If the allocated memory is freed, the return value is `KVERR_Success`.
- Otherwise, the return value is an error code.

## Example

The example below frees the memory allocated by `fpGetSubFileInfo()`:

    if ( subFileInfo )
        {
            extractInterface->fpFreeStruct(pFile,subFileInfo);
            subFileInfo = NULL;
        }

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: fpFreeStruct()