File Content Extraction 26.1
Viewing SDK Programming Guide

# VAPIMWP_INIT_GETHWNDVIEWER

Gets the handle of the Viewer window. This is a parameter of the `VAPIM_INIT` message.

## Syntax

    #include <kvvapi.h>
    SendMessage(hWndVAPI, VAPIM_INIT, VAPIMWP_INIT_GETHWNDVIEWER,
               (LPARAM) (HWND*) lphWndViewer );

## Arguments

Argument | Description
--- | ---
`hWndVAPI` | The handle of the VAPI window.
`lphWndViewer` | A pointer to a handle that returns the Viewer window handle.

## Returns

`SendMessage()` returns `TRUE` if the Viewer window exists; otherwise it returns `FALSE`.

## Discussion

You must send this message after you send the `VAPIMWP_INIT_OPEN_DOCUMENT` message to open the document, otherwise the Viewer window does not exist yet.

Copyright 2016-2025 Open Text
Version 26.1 | Last updated January 2026

Send documentation feedback

Close

Send documentation feedback

To send feedback using your default email client, open an email window.

Otherwise, send your feedback and the information below to MFI-swpdl.idoldocsfeedback@opentext.com.

We appreciate your feedback!

Product: File Content Extraction 26.1

Topic Title: VAPIMWP_INIT_GETHWNDVIEWER