File Content Extraction 25.1
HTML Export SDK C Programming Guide

# fpOpenSubFile()

This function opens a subfile as a stream, which can be used directly or passed to other File Content Extraction interfaces.

## Syntax

    int (pascal *fpOpenSubFile) (
            void                  *pFile,
            KVExtractSubFileArg    extractArg,
            KVInputStream        **stream);

## Arguments

`pFile` | The identifier of the file. This is a file handle returned from fpOpenFile().
`extractArg` | A pointer to the structure KVExtractSubFileArg, which defines the subfile to extract. Before you initialize the KVExtractSubFileArg structure, use the macro `KVStructInit` to initialize the `KVStructHead` structure. For this call, you do not need to set either the `filePath` or `stream` members of this structure.
`stream` | A pointer that will receive the opened input stream.

## Returns

- If the subfile is opened, the return value is `KVERR_Success`.
- If the subfile is not opened, the return value is an error code.

## Discussion

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

After the file is extracted, call fpCloseSubFile() to free the resources used for the stream.

You cannot use the reader `pdf2sr` (see Use the pdf2sr Reader) when using this function to extract files to a stream.

## Example

    KVExtractSubFileArgRec extractArg = {0};
    KVInputStream stream = NULL;

    KVStructInit(&extractArg);
    extractArg.index = index;

    error = extractInterface->fpOpenSubFile(pFile, &extractArg, &stream);
    if (error)
    {
        /* Handle error here */
    }
    else
    {
        /* Use stream here */

        extractInterface->fpCloseSubFile(stream);
    }

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Version 25.1 | Last updated January 2025

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Product: File Content Extraction 25.1

Topic Title: fpOpenSubFile()