PagePaintHook

This function is an application-defined or library-defined callback function used with the PageSetupDlg function. PagePaintHook receives messages that allow you to customize drawing of the sample page in the Page Setup dialog box.

The LPPAGEPAINTHOOK type defines a pointer to this callback function. PagePaintHook is a placeholder for the application-defined or library-defined function name.

At a Glance

Syntax

UINT CALLBACK PagePaintHook(HWND hdlg, UINT uiMsg,
WPARAM wParam, LPARAM lParam);

Parameters

hdlg

Handle to the Page Setup dialog box window.

uiMsg

Identifies the message being received.

wParam

Specifies additional information about the message. The exact meaning depends on the value of the uiMsg parameter.

lParam

Specifies additional information about the message. The exact meaning depends on the value of the uiMsg parameter.

Return Values

If the hook procedure returns TRUE for any of the first three messages of a drawing sequence (WM_PSD_PAGESETUPDLG, WM_PSD_FULLPAGERECT, or WM_PSD_MINMARGINRECT), the dialog box sends no more messages and does not draw in the sample page until the next time the system needs to redraw the sample page. If the hook procedure returns FALSE for all three messages, the dialog box sends the remaining messages of the drawing sequence.

If the hook procedure returns TRUE for any of the remaining messages in a drawing sequence, the dialog box does not draw the corresponding portion of the sample page. If the hook procedure returns FALSE for any of these messages, the dialog box draws that portion of the sample page.

Remarks

The Page Setup dialog box includes an image of a sample page that shows how user selections affect the appearance of the printed output. The image consists of a rectangle that represents the selected paper or envelope type, with a dotted-line rectangle representing the current margins, and partial (Greek text) characters to show how text looks on the printed page. When you use the PageSetupDlg function to create a Page Setup dialog box, you can provide a PagePaintHook hook procedure to customize the appearance of the sample page.

To enable the hook procedure, use the PAGESETUPDLG structure that you passed to the dialog creation function. Specify the pointer to the hook procedure in the lpfnPagePaintHook member and specify the PSD_ENABLEPAGEPAINTHOOK flag in the Flags member.

When the dialog box is about to draw the contents of the sample page, the hook procedure receives messages in a specific order. The following table lists the messages in the order in which they are received.