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WM_INITMENUPOPUP Overview  Group

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

WM_INITMENUPOPUP 

hmenuPopup = (HMENU) wParam;         // handle of submenu

uPos = (UINT) LOWORD(lParam);        // submenu item position 

fSystemMenu = (BOOL) HIWORD(lParam); // window menu flag 

 

Parameters

hmenuPopup
Value of wParam. Identifies the drop-down menu or submenu.
uPos
Value of the low-order word of lParam. Specifies the zero-based relative position of the menu item that opens the drop-down menu or submenu.
fSystemMenu
Value of the high-order word of lParam. Specifies whether the drop-down menu is the window menu (also known as the System menu or the Control menu). If the menu is the window menu, this parameter is TRUE; otherwise, it is FALSE.

Return Values

If an application processes this message, it should return zero.

See Also

WM_INITMENU 

 

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