EM_GETUNDONAME Message

Microsoft Rich Edit 2.0 and later: An application sends an EM_GETUNDONAME message to a rich edit control to retrieve the type of the next undo action, if any.

Rich Edit 1.0: This message is not supported.

To send this message, call the SendMessage function with the following parameters.

Syntax

lResult = SendMessage( 
  (HWND) hWnd,
  (UINT) EM_GETUNDONAME,
  (WPARAM) wParam,
  (LPARAM) lParam
);

Parameters

wParam
Not used; must be zero.
lParam
Not used; must be zero.

Return Value

If there is an undo action, the value returned is an UNDONAMEID enumeration value that indicates the type of the next action in the control's undo queue.
If there are no actions that can be undone or the type of the next undo action is unknown, the return value is zero.

Remarks

The types of actions that can be undone or redone include typing, delete, drag, drop, cut, and paste operations. This information can be useful for applications that provide an extended user interface for undo and redo operations, such as a drop-down list box of actions that can be undone.

Message Information

Header Declared in Richedit.h
Minimum operating systems Windows 95 with Rich Edit 2.0, Windows 98, Windows NT 4.0