An application sends a DM_GETDEFID message to retrieve the identifier of the default push button control for a dialog box.
DM_GETDEFID
This message has no parameters.
If a default push button exists, the high-order word of the return value contains the value DC_HASDEFID and the low-order word contains the control identifier. Otherwise, the return value is zero.
The DefDlgProc function processes this message.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.
Dialog Boxes Overview, Dialog Box Messages, DefDlgProc, DM_SETDEFID