Sent to the owner window of a modal dialog box or menu that is entering an idle state. A modal dialog box or menu enters an idle state when no messages are waiting in its queue after it has processed one or more previous messages.
This parameter can be one of the following values.
The system is idle because a dialog box is displayed.
The system is idle because a menu is displayed.
A handle to the dialog box (if wParam is MSGF_DIALOGBOX) or window containing the displayed menu (if wParam is MSGF_MENU).
An application should return zero if it processes this message.
You can suppress the WM_ENTERIDLE message for a dialog box by creating the dialog box with the DS_NOIDLEMSG style.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|