IE_CANUNDO

Retrieves an indication of whether the control can undo the last user operation.

Parameters

wParam

Not used; must be 0.

lParam

Not used; must be 0.

Return Value

Returns one of the following values:

Constant
Description
IER_YES
The control can undo the last operation.
IER_NO
The control cannot undo the last operation or the control has security protection disallowing an undo operation.
IER_PARAMERR
wParam or lParam is invalid.

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