WM_MENUCHAR

The WM_MENUCHAR message is sent when a menu is active and the user presses a key that does not correspond to any mnemonic or accelerator key. This message is sent to the window that owns the menu.

WM_MENUCHAR

chUser = (char) LOWORD(wParam); // ASCII character

fuFlag = (UINT) HIWORD(wParam); // menu flag

hmenu = (HMENU) lParam; // handle of menu

Parameters

chUser

Value of the low-order word of wParam. Specifies the ASCII character that corresponds to the key the user pressed.

fuFlag

Value of the high-order word of wParam. Specifies the type of the active menu. This parameter can be one of the following values:

Value	Meaning
MF_POPUP	drop-down menu, submenu, or shortcut menu
MF_SYSMENU	window menu (System menu or Control menu)

hmenu

Value of lParam. Identifies the active menu.

Return Values

An application that processes this message should return one of the following values in the high-order word of the return value:

Value	Meaning
0	Informs Windows that it should discard the character the user pressed and create a short beep on the system speaker.
	Informs Windows that it should close the active menu.
	Informs Windows that the low-order word of the return value specifies the zero-based relative position of a menu item. This item is selected by Windows.

Remarks

The low-order word is ignored if the high-order word contains 0 or 1. An application should process this message when an accelerator is used to select a menu item that displays a bitmap.

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