EM_CANUNDO  I76UPE 

An application sends an EM_CANUNDO message to determine whether an edit-control operation can be undone; that is, whether the control can respond to the EM_UNDO message.

EM_CANUNDO

wParam = 0; // not used; must be zero

lParam = 0; // not used; must be zero

Parameters

This message has no parameters.

Return Values

If the edit control can correctly process the EM_UNDO message, the return value is TRUE; otherwise, it is FALSE.

See Also