COM相关问题：这样的事件如何设置？

IHTMLDocument2::onkeypress Property--------------------------------------------------------------------------------Sets or retrieves a pointer to the event handler function associated with the onkeypress event.SyntaxHRESULT IHTMLDocument2::get_onkeypress(VARIANT *p);HRESULT IHTMLDocument2::put_onkeypress(VARIANT v);
这样的事件如何设置呀，麻烦大虾们给个示例，thanks!