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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