File Content Extraction 25.1
XML Export SDK C Programming Guide

# KVInputStream

This structure defines an input stream for the XML conversion. The structure is defined in `kvstream.h`.

    typedef struct tag_InputStream
    {
       void *pInputStreamPrivateData;
       long lcbFilesize;
       BOOL (pascal *fpOpen) (struct tag_InputStream *);
       UINT (pascal *fpRead) (struct tag_InputStream *, BYTE *, UINT);
       BOOL (pascal *fpSeek) (struct tag_InputStream *, long, int);
       long (pascal *fpTell) (struct tag_InputStream *);
       BOOL (pascal *fpClose)(struct tag_InputStream *);
    }
    KVInputStream;

## Member Descriptions

All member functions are equivalent to their counterparts in the ANSI standard library, except `fpOpen()`, which returns `FALSE` on failure.

If the size of the stream is known, assign that value to `lcbFilesize`. Otherwise, set `lcbFilesize` to `0`.

When the file size is known, File Content Extraction can reduce the number of times it needs to read or seek the underlying stream. This optimization can improve performance for some file types or operations.

NOTE: If the file size is not set to zero or the correct file size, the behavior is undefined.

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Version 25.1 | Last updated January 2025

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Product: File Content Extraction 25.1

Topic Title: KVInputStream