WM_COMMAND
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4/8/2010
This message is sent when the user selects a command item from a menu, when a control sends a message to its parent window, or when an accelerator keystroke is translated.
Syntax
WM_COMMAND wNotifyCode = HIWORD(wParam);
wID = LOWORD(wParam);
hwndCtl = (HWND) lParam;
Parameters
- wNotifyCode
Value of the high-order word of wParam. Specifies the notification code if the message is from a control. If the message is from an accelerator, this parameter is 1. If the message is from a menu, this parameter is 0.
- wID
Value of the low-order word of wParam. Specifies the identifier of the menu item, control, or accelerator.
- hwndCtl
Handle to the control sending the message if the message is from a control. Otherwise, this parameter is NULL.
Return Value
An application should return zero if it processes this message.
Remarks
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_COMMANDmessage 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.
Requirements
| Header | winuser.h |
| Windows Embedded CE | Windows CE 1.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |