IOleInPlaceSite::DiscardUndoState method (oleidl.h)
Instructs the container to discard its undo state. The container should not call IOleInPlaceObject::ReActivateAndUndo.
Syntax
HRESULT DiscardUndoState();
Return value
This method returns S_OK on success. Other possible return values include the following.
| Return code | Description |
|---|---|
|
An unexpected error has occurred. |
Remarks
If an object is activated in place and the object's associated object application maintains only one level of undo, there is no need to have more than one entry on the undo stack. That is, after a change has been made to the active object that invalidates its undo state saved by the container, there is no need to maintain this undo state in the container.
Notes to Callers
DiscardUndoState is called by the active object while performing some action that would discard the undo state of the object. The in-place object calls this method to notify the container to discard the object's last saved undo state.Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | oleidl.h |