File Content Extraction 26.1
Viewing SDK Programming Guide

# VAPINM_EXTENT

Reports that the user changed the view extent.

## Syntax

    #include <kvvapi.h>
    VAPINM_EXTENT = uMsg;
    (wParam is not used)
    TPVAPIFirstLast lpFirstLast = (TPVAPIFirstLast*) lParam;

## Arguments

Argument | Description
--- | ---
`lpFirstLast` | A pointer to a TPVAPIFirstLast structure that defines the view extent.

## Returns

None

## Discussion

This message is received to report the first and last logical addresses that are currently displayed. This message is generated when the user scrolls the document or resizes the client area. This message is not generated until a `SB_ENDSCROLL` or `WM_KEYUP` message is received in the case of a scroll.

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: VAPINM_EXTENT