File Content Extraction 26.1
Filter SDK C Programming Guide

# fpRefreshFilterKVOOP()

This function forces the out-of-process filtering server (`filter_kvoop.exe`) to restart. It is not normally necessary to call this function, and it is for advanced usage only. File Content Extraction automatically restarts `filter_kvoop.exe` when it detects a hang, and in accordance with kvoopRefresh. For more information, see Persist the Child Process.

## Syntax

    KVErrorCode pascal fpRefreshFilterKVOOP(KVFilterSession session);

## Arguments

`session` | A Filter session that you initialized by calling fpInit().

## Returns

- If the restart is successful, the return value is `KVERR_Success`.
- If the restart is unsuccessful, the return value is an error code.

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: fpRefreshFilterKVOOP()