The WM_PSD_ENVSTAMPRECT message notifies the hook procedure of a Page Setup dialog box that the dialog box is about to draw the envelope-stamp rectangle of the sample page.
WM_PSD_ENVSTAMPRECT
hDC = (WPARAM) (HDC) wParam; // handle of the device context
lprcEnvStamp = (LPARAM) (LPRECT) lParam; // envelope-stamp rectangle
If the hook procedure returns TRUE, the dialog box does not draw the envelope-stamp portion of the sample page.
If the hook procedure returns FALSE, the dialog box draws the envelope-stamp portion of the sample page.
The Page Setup dialog box includes an image of a sample page that shows how the user's selections affect the appearance of the printed output. When you call the PageSetupDlg function, you can provide a PagePaintHook hook procedure to customize the appearance of the sample page. Whenever the dialog box is about to draw the contents of the sample page, the dialog box sends a sequence of WM_PSD* messages to the hook procedure.
A hook procedure receives this message only if the selected paper type is an envelope.
Windows NT: Requires version 3.51 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in commdlg.h.
Common Dialog Box Library Overview, Common Dialog Box Messages, PagePaintHook, PageSetupDlg, RECT, WM_PSD_PAGESETUPDLG