IE_EMPTYUNDOBUFFER

Empties the undo buffer.

Parameters

wParam

Not used; must be 0.

lParam

Not used; must be 0.

Return Value

Returns one of the following:

Constant	Description
IER_OK	Success.
IER_PARAMERR	wParam or lParam is invalid.
IER_SECURITY	The control has security protection disallowing the operation.

Comments

If there is nothing in the undo buffer, this message returns IER_OK but does nothing else. As long as the buffer remains empty after sending IE_EMPTYUNDOBUFFER, the messages IE_CANUNDO and WM_UNDO return FALSE.

See Also

IE_CANUNDO

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