File Content Extraction 25.2
Filter SDK C Programming Guide

# fpGetMainFileInfo()

This function determines whether a file is a container file—that is, whether it contains subfiles—and should be extracted further.

## Syntax

    int (pascal *fpGetMainFileInfo) (
        void               *pFile,
        KVMainFileInfo     *fileInfo);

## Arguments

`pFile` | The identifier of the file. This is a file handle returned from fpOpenFile() or fpOpenFileFromFilterSession().
`fileInfo` | On success, this KVMainFileInfo points to a newly allocated structure, which provides information about this container file.

## Returns

- If the file information is retrieved, the return value is `KVERR_Success`.

- If the file information is not retrieved, the return value is an error code.

## Lifetime and Memory Management

- You must call fpFreeStruct() to free the memory allocated for `fileInfo`. You must free this memory before you call fpCloseFile().

## Discussion

- If the file is a container (`fileInfo->numSubFiles` is non-zero), you can call fpGetSubFileInfo() and fpExtractSubFile() for each subfile to get information about and extract each subfile.

## Example

    KVMainFileInfo   fileInfo    = NULL;
    if( (error=extractInterface->fpGetMainFileInfo(pFile,&fileInfo)))
    {
        /* Free result object allocated in fileInfo */
        extractInterface->fpFreeStruct(pFile,fileInfo);
        fileInfo = NULL;
    }

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Version 25.2 | Last updated April 2025

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Product: File Content Extraction 25.2

Topic Title: fpGetMainFileInfo()