WM_INITMENUPOPUP

hmenuPopup = (HMENU) wParam; /* handle of pop-up menu */

uPos = (UINT) LOWORD(lParam); /* pop-up item position */

fSystemMenu = (BOOL) HIWORD(lParam); /* System-menu flag */

The WM_INITMENUPOPUP message is sent when a pop-up menu is about to become active. This allows an application to modify the pop-up menu before it is displayed, without changing the entire menu.

Parameters

wParam

Value of wParam. Identifies the pop-up menu.

uPos

Value of the low-order word of lParam. Specifies the zero-based relative position of the menu item that invokes the pop-up menu.

fSystemMenu

Value of the high-order word of lParam. Specifies a nonzero value if the pop-up menu is the System menu; otherwise, this parameter is zero.

Return Value

An application should return zero if it processes this message.