如何获取Internet Explorer提供的原始IDocHostUIHandler？

发布于 2024-12-08 21:03:01 字数 487 浏览 1 评论 0原文

在IDocHostUIHandler 接口的文档，在谈论使用 BHO 中的 ICustomDoc 导致的内存泄漏时，有一段关于 IE 提供的默认 UI 处理程序：

To avoid a memory leak: 

 1. Always forward the IDocHostUIHandler::ShowUI and
IDocHostUIHandler::HideUI methods to the original handler. 
 2. Release the pointer to the original UI handler when your object is called
with IObjectWithSite::SetSite(NULL).

如何获取主机接口以释放它？

原文

In the documentation of the IDocHostUIHandler Interface, there is a paragraph about the default UI handler provided by IE when talking about a memory leak caused by using ICustomDoc from a BHO:

To avoid a memory leak: 

 1. Always forward the IDocHostUIHandler::ShowUI and
IDocHostUIHandler::HideUI methods to the original handler. 
 2. Release the pointer to the original UI handler when your object is called
with IObjectWithSite::SetSite(NULL).

How to get the host interface in order to release it?

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怎樣才叫好 2024-12-15 21:03:01

虽然不受官方支持，但您仍然可以获得对原始 IDocHostUIHandler 的引用，以便传递对您不打算在 BHO 中覆盖的所有方法的调用。

首先，将文档转换为 IOleObject，然后调用 GetClientSite 以获取原始 IOleClientSite 对象。然后可以将其转换为 IDocHostUIHandler 或 IOleCommandTarget，以便从原始处理程序/目标上的这些接口调用方法。

下面是来自 C# BHO 的 DocumentComplete 事件的示例代码片段（Explorer 是 ShDocVw.WebBrowserClass 的实例，UIHandler 是我自己的< code>IDocHostUIHandler 类，它将调用传递给初始化程序中传递的对象，所有接口均直接取自 http://pinvoke.net)：

IOleObject obj = Explorer.Document as IOleObject;
if (obj != null)
{
    IOleClientSite cs = null;
    obj.GetClientSite(ref cs);

    if (cs != null)
    {
        ICustomDoc cDoc = Explorer.Document as ICustomDoc;
        if (cDoc != null)
        {
            cDoc.SetUIHandler(new UIHandler(cs));
        }
    }
}

这是根据 PopupBlocker 项目中的 C++ 代码改编的，此处提供 http://www.codeproject.com/Articles/4003/Popup-Window-Blocker

While not officially supported, you can still get a reference to the original IDocHostUIHandler in order to pass calls through on all of the methods you don't plan on overriding in your BHO.

First you cast the document as an IOleObject and then call GetClientSite in order to obtain the original IOleClientSite object. This can then be cast to either IDocHostUIHandler or IOleCommandTarget in order to call the methods from those interfaces on the original handler/target.

Here is an example code snippet from the DocumentComplete event of a C# BHO (Explorer is an instance of ShDocVw.WebBrowserClass, UIHandler is my own IDocHostUIHandler class which passes calls through to the object passed in the initializer, and all of the interfaces were taken directly from http://pinvoke.net):

IOleObject obj = Explorer.Document as IOleObject;
if (obj != null)
{
    IOleClientSite cs = null;
    obj.GetClientSite(ref cs);

    if (cs != null)
    {
        ICustomDoc cDoc = Explorer.Document as ICustomDoc;
        if (cDoc != null)
        {
            cDoc.SetUIHandler(new UIHandler(cs));
        }
    }
}

This was adapted from C++ code available in the PopupBlocker project available here http://www.codeproject.com/Articles/4003/Popup-Window-Blocker

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