VAPIMWP_DRAW_DRAWTOFILE
Draws a page of a document to a graphic file (thumbnail). This is a parameter of the VAPIM_DRAW
message.
Syntax
#include <kvvapi.h> SendMessage(hWndVAPI,VAPIM_DRAW, VAPIMWP_DRAW_DRAWTOFILE, (LPARAM) (TPVAPIDrawFileInfo*) pDrawInfo );
Arguments
Argument |
Description |
---|---|
|
The handle of the VAPI window. |
|
A pointer to a TPVAPIDrawFileInfo structure that contains information used for drawing a page to a file. To draw pages in any order, set the |
Returns
SendMessage()
returns:
-
VAPI_RETURN_SUCCESS
if the call succeeds. -
VAPI_RETURN_NOT_INITIALIZED
if the drawing routines have not been initialized. -
VAPI_RETURN_NO_PAGE
if the requested page does not exist, or is being displayed before all previous pages have been displayed. -
VAPI_RETURN_NOT_AVAILABLE
if the document does not support this feature (for example, ZIP files, video, audio). -
VAPI_RETURN_ERROR
if an error has occurred.
Discussion
- Before you send this message, initialize VAPI by sending the VAPIMWP_DRAW_INIT message, and then open the document by sending the VAPIMWP_INIT_OPEN_DOCUMENT message.
-
Page numbers start at 0. For example, set
uPageNumbers
to0
to draw page 1, and to1
to draw page 2. For word processing documents, pages must be drawn sequentially. For example, to draw page 3, you must first draw pages 0 and 1.To draw pages in any order, set the
bWait
parameter in the TPVAPIOpenDocumentInfo structure toFALSE
.