# VAPIMWP_VIEW_CANPREVIEWPANE

Determines whether a file can be viewed in a preview pane. The message indicates `TRUE` only when container formats such as ZIP, TAR, or PST files are viewed.

To determine whether the preview pane is being used, use the `VAPIMWP_VIEW_GETPREVIEWPANE` message.

To specify if the preview pane should be used, use the `VAPIMWP_VIEW_SETPREVIEWPANE` message.

This is a parameter of the `VAPIM_VIEW` message.

## Syntax

    #include <kvvapi.h>
    SendMessage(hWndVAPI, VAPIM_VIEW, VAPIMWP_VIEW_CANPREVIEWPANE,
               (LPARAM) (BOOL*) lpbCanPreviewPane );

## Arguments

Argument | Description
--- | ---
`hWndVAPI` | The handle of the VAPI window.
`lpbCanPreviewPane` | A pointer to a flag that returns `TRUE` or `FALSE`, depending on whether the document can be viewed in a preview pane. Only container files use the preview pane.

## Returns

- `SendMessage()` returns `TRUE` if the call succeeds, in which case `lpbCanPreviewPane` returns `TRUE` or `FALSE`.
- `SendMessage()` returns `FALSE` if the call fails (for example, if there are invalid arguments or if no document is open), in which case `lpbCanPreviewPane` is undefined.

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