File Content Extraction 25.3
Viewing SDK Programming Guide

# VAPIM_ANNOTATE

Adds and deletes annotations, and determines whether annotations exist.

## Syntax

    #include <kvvapi.h>
    SendMessage(hWndVAPI,
                VAPIM_ANNOTATE,
               (WPARAM) wControl,
               (LPARAM) (TPVAPIAnnotation*) lpAnnotation );

## Arguments

Argument | Description
--- | ---
`hWndVAPI` | The handle of the VAPI window.
`wControl` | `KV_DEL_ANNOTATION` (0) – delete annotation `KV_ADD_ANNOTATION` (1) – add annotation `KV_ANNOTATION_EXISTS` (2) – query annotation
`lpAnnotation` | A pointer to a TPVAPIAnnotation structure that defines the annotation.

## Returns

- For `KV_DEL_ANNOTATION`, `SendMessage()` returns `TRUE` if successful; `FALSE` if the annotation did not exist.

- For `KV_ADD_ANNOTATION`, `SendMessage()` returns `0` if successful; `1` if out of memory; `2` if the annotation could not be added because it would cause an overlap with an existing annotation; and `3` if the logical address was invalid.

- For `KV_ANNOTATION_EXISTS`, `SendMessage()` returns `TRUE` if the annotation exists; `FALSE` otherwise.

## Discussion

The size of the bitmap is not relevant.

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Version 25.3 | Last updated July 2025

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Product: File Content Extraction 25.3

Topic Title: VAPIM_ANNOTATE