File Content Extraction 25.4
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.

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Version 25.4 | Last updated October 2025

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Product: File Content Extraction 25.4

Topic Title: VAPIMWP_INIT_GETHWNDVIEWER