The WM_COMMAND message is sent when the user selects a command item from a menu, when a control sends a notification message to its parent window, or when an accelerator keystroke is translated.
WM_COMMAND wNotifyCode = HIWORD(wParam); // notification code wID = LOWORD(wParam); // item, control, or accelerator identifier hwndCtl = (HWND) lParam; // handle of control
If an application processes this message, it should return zero.
Accelerator keystrokes that select items from the window menu are translated into WM_SYSCOMMAND messages.
If an accelerator keystroke occurs that corresponds to a menu item when the window that owns the menu is minimized, no WM_COMMAND message is sent. However, if an accelerator keystroke occurs that does not match any of the items in the window’s menu or in the window menu, a WM_COMMAND message is sent, even if the window is minimized.
If an application enables a menu separator, the system sends a WM_COMMAND message with the low-word of the wParam parameter set to zero when the user selects the separator.
file: /Techref/os/win/api/win32/mess/src/msg22_17.htm, 2KB, , updated: 2000/4/7 12:20, local time: 2024/8/31 23:43,
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