File Content Extraction 25.2
Filter SDK C Programming Guide

# KVExtractInterface

The members of this structure are pointers to the file extraction functions described in File Extraction API Functions. Calling the fpGetExtractInterface() function assigns the function pointers in the structure. The structure is defined in `kvxtract.h`.

    typedef struct  tag_KVExtractInterface
    {
    KVStructHeader;
      int  (pascal *fpOpenFile) (void *pContext,KVOpenFileArg openArg, void **pFileHandle);
      int  (pascal *fpCloseFile)   (void *pFileHandle);
      int  (pascal *fpGetMainFileInfo) (void *pFile, KVMainFileInfo *MainFileInfo);
      int  (pascal *fpGetSubFileInfo)  (void *pFile, int index, KVSubFileInfo *subFileInfo);
      int  (pascal *fpGetSubFileMetaData)  (void *pFile, KVGetSubFileMetaArg metaArg, KVSubFileMetaData *metaData);
      int  (pascal *fpExtractSubFile)  (void *pFile, KVExtractSubFileArg extractArg, KVSubFileExtractInfo *extractInfo);
      int  (pascal *fpFreeStruct) (void *pFile, void *obj);
      int  (pascal *fpOpenSubFile) (void *pFile, KVExtractSubFileArg extractArg, KVInputStream **stream);
      int  (pascal *fpGetExtractInfo)(KVInputStream* stream, KVSubFileExtractInfo* extractInfo);
      int  (pascal *fpGetExtractStatus)(KVInputStream* stream);
      int  (pascal *fpCloseSubFile) (KVInputStream *stream);
    }
    KVExtractInterfaceRec, *KVExtractInterface;

## Member Descriptions

The member functions are described in File Extraction API Functions.

## Discussion

Before you initialize a File Extraction structure, use the `KVStructInit` macro to initialize the `KVStructHead` structure. This process sets the revision number of the File Extraction API and supports binary compatibility with future releases.

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Version 25.2 | Last updated April 2025

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Product: File Content Extraction 25.2

Topic Title: KVExtractInterface