File Content Extraction 25.3
Filter SDK C Programming Guide

# fpGetSubFileMetadataList()

Containers can store metadata about their subfiles that is independent of the metadata stored within those subfiles. This function allows you to retrieve the metadata stored within the container about a particular subfile.

## Syntax

    KVErrorCode pascal fpGetSubFileMetadataList(
        void* const pFile,
        KVGetSubFileMetadataListArg args,
        const KVMetadataList** const ppMetadataList);

## Arguments

`pfile` | The identifier of the container file - a file handle that you obtained by calling fpOpenFile() or fpOpenFileFromFilterSession().
`args` | A KVGetSubFileMetadataListArg structure, which specifies how to retrieve the subfile metadata.
`ppMetadataList` | A pointer to a KVMetadataList*. On success, `fpGetSubFileMetadataList()` sets this pointer to the address of a new KVMetadataList that contains the function pointers for accessing metadata elements.

## Returns

The return value is an error code.

## Lifetime and Memory Management

You must free the KVMetadataList pointer by using its fpFree() function. Free this pointer only when `fpGetSubFileMetadadataList()` returns `KVError_Success`. You must free this pointer before you call fpCloseFile().

## Discussion

Before retrieving any subfile metadata, you must get the main file information by calling fpGetMainFileInfo().

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Version 25.3 | Last updated July 2025

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Product: File Content Extraction 25.3

Topic Title: fpGetSubFileMetadataList()