在IHTMLElement事件处理程序中未获得事件参数 [英] Not getting event arguments in IHTMLElement event handler

问题描述

我添加了一个回调到IHTMLElement实例，但是当为事件调用IDispatch :: Invoke时，没有任何参数（即pDispParams-> cArgs和pDispParams-> cNamedArgs始终为0）。例如，我为onmouseup事件添加回调。从我可以告诉，这个事件的回调应该是接收一个MouseEvent对象。那是对的吗？如果是，我需要做什么来确保这种情况发生？

I've added a callback to an IHTMLElement instance but when the IDispatch::Invoke is called for the event, there are never any arguments (i.e. the pDispParams->cArgs and pDispParams->cNamedArgs are always 0). For example, I add a callback for an onmouseup event. From what I can tell, a callback for this event is supposed to receive a MouseEvent object. Is that correct? If so, what do I need to do to ensure this happens?

这是在Windows XP SP2上使用IE 6 sp2（或更高版本）的MSHTML。

This is using the MSHTML for IE 6 sp2 (or better) on Windows XP SP2.

推荐答案

所有DOM事件（包括 onmouseup ）的事件参数存储在父窗口的事件属性（ IHTMLWindow2 :: event ）

Events arguments for all DOM events including onmouseup are stored in the parent window's event property (IHTMLWindow2::event)

如果您尚未缓存父窗口， IHTMLElement 具有返回 IHTMLDocument 接口的文档属性。从中可以查询具有 parentWindow 属性的 IHTMLDocument2 返回的 IHTMLWindow2 具有您正在查找的事件属性。您应该可以从那里查询事件界面。

If you don't already have the parent window cached, IHTMLElement has a document property which returns an IHTMLDocument interface. From that you can query for IHTMLDocument2 which has a parentWindow property. The IHTMLWindow2 that is returned has the event property you're looking for. You should be able to query for the event interface from there.

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