Ruby WIN32OLE_EVENT#on_event用法及代码示例

定义回调事件。如果省略参数，则此方法定义所有事件的回调。如果要修改回调中的引用参数，请在回调中返回哈希。如果您想将值作为回调的结果返回给 OLE 服务器，请使用 ‘return’ 或：return。

ie = WIN32OLE.new('InternetExplorer.Application')
ev = WIN32OLE_EVENT.new(ie)
ev.on_event("NavigateComplete") {|url| puts url}
ev.on_event() {|ev, *args| puts "#{ev} fired"}

ev.on_event("BeforeNavigate2") {|*args|
  ...
  # set true to BeforeNavigate reference argument `Cancel'.
  # Cancel is 7-th argument of BeforeNavigate,
  # so you can use 6 as key of hash instead of 'Cancel'.
  # The argument is counted from 0.
  # The hash key of 0 means first argument.)
  {:Cancel => true}  # or {'Cancel' => true} or {6 => true}
}

ev.on_event(...) {|*args|
  {:return => 1, :xxx => yyy}
}