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 of 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 of the main (clicked) menu; use the GetSubMenu function to get the menu handle of 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. Identifies 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, Windows 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.
See Also