WM_MENUSELECT

The WM_MENUSELECT message is sent to a menu's owner window when the user selects a menu item.

WM_MENUSELECT 
uItem = (UINT) LOWORD(wParam);   // menu item or submenu index 
fuFlags = (UINT) HIWORD(wParam); // menu flags 
hmenu = (HMENU) lParam;          // handle to menu clicked 
 

Parameters

uItem
Value of the low-order word of wParam. If the selected item is a command item, this parameter contains the identifier of the menu item. If the selected item opens a drop-down menu or submenu, this parameter contains the menu index of the drop-down menu or submenu in the main menu, and the hMenu parameter then contains the handle to the main (clicked) menu; use the GetSubMenu function to get the menu handle to the drop-down menu or submenu.
fuFlags
Value of the high-order word of wParam. Specifies one or more menu flags. This parameter can be a combination of the following values:
Value Description
MF_BITMAP Item displays a bitmap.
MF_CHECKED Item is checked.
MF_DISABLED Item is disabled.
MF_GRAYED Item is grayed.
MF_HILITE Item is highlighted.
MF_MOUSESELECT Item is selected with the mouse.
MF_OWNERDRAW Item is an owner-drawn item.
MF_POPUP Item opens a drop-down menu or submenu.
MF_SYSMENU Item is contained in the window menu (also known as the System menu or Control menu). The hmenu parameter identifies the window menu associated with the message.

hmenu
Value of lParam. Handle to the menu that was clicked.

Return Values

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

Remarks

If the fuFlags parameter contains 0xFFFF and the hmenu parameter contains NULL, the system has closed the menu.

Do not use the value –1 for fuFlags. That is because fuFlags is specified as (UINT) HIWORD(wParam). If HIWORD(wParam) were 0xFFFF, fuFlags (because of the UINT cast) would be 0x0000FFFF, not –1.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.

See Also

Keyboard Accelerators Overview, Keyboard Accelerator Messages, GetSubMenu