UMPLatForm.NET 中MiNiWeb浏览器核心技术详解二（接上篇）

UMPLatForm.NET [/b]中[/b]MiNiWeb[/b]浏览器核心技术详解二[/b]

接上一篇：UMPLatForm.NET 中MiNiWeb浏览器核心技术详解一

3、创建webbrowser扩展组件
从上一节中，我们可以发现上述的所有内容都基本可以归结为两件事：
1. 实现一个iwebbrowser2类型的对象，从中获得application属性
2. 实现dwebbrowserevents2接口来触发事件
实现iwebbrowser2接口

using System;
using System.Security;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Security.Permissions;

namespace MiniBrowser
{
/// <summary>
/// An extended version of the <see cref="WebBrowser"/> control.
/// </summary>
class ExtendedWebBrowser : System.Windows.Forms.WebBrowser
{
private UnsafeNativeMethods.IWebBrowser2 axIWebBrowser2;

/// <summary>
/// This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
/// Called by the control when the underlying ActiveX control is created.
/// </summary>
/// <param name="nativeActiveXObject"></param>
[PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")]
protected override void AttachInterfaces(objectnativeActiveXObject)
{
this.axIWebBrowser2 = (UnsafeNativeMethods.IWebBrowser2)nativeActiveXObject;
base.AttachInterfaces(nativeActiveXObject);
}

/// <summary>
/// This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
/// Called by the control when the underlying ActiveX control is discarded.
/// </summary>
[PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")]
protected override void DetachInterfaces()
{
this.axIWebBrowser2 = null;
base.DetachInterfaces();
}

/// <summary>
/// Returns the automation object for the web browser
/// </summary>
public object Application
{
get { return axIWebBrowser2.Application; }
}

System.Windows.Forms.AxHost.ConnectionPointCookie cookie;
WebBrowserExtendedEvents events;

/// <summary>
/// This method will be called to give you a chance to create your own event sink
/// </summary>
[PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")]
protected override void CreateSink()
{
// Make sure to call the base class or the normal events won't fire
base.CreateSink();
events = new WebBrowserExtendedEvents(this);
cookie = newAxHost.ConnectionPointCookie(this.ActiveXInstance, events,typeof(UnsafeNativeMethods.DWebBrowserEvents2));
}

/// <summary>
/// Detaches the event sink
/// </summary>
[PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")]
protected override void DetachSink()
{
if (null != cookie)
{
cookie.Disconnect();
cookie = null;
}
}

/// <summary>
/// Fires when downloading of a document begins
/// </summary>
public event EventHandler Downloading;

/// <summary>
/// Raises the <see cref="Downloading"/> event
/// </summary>
/// <param name="e">Empty <see cref="EventArgs"/></param>
/// <remarks>
/// You could start an animation or a notification that downloading is starting
/// </remarks>
protected void OnDownloading(EventArgs e)
{
if (Downloading != null)
Downloading(this, e);
}

/// <summary>
/// Fires when downloading is completed
/// </summary>
/// <remarks>
/// Here you could start monitoring for script errors.
/// </remarks>
public event EventHandler DownloadComplete;

/// <summary>
/// Raises the <see cref="DownloadComplete"/> event
/// </summary>
/// <param name="e">Empty <see cref="EventArgs"/></param>
protected virtual void OnDownloadComplete(EventArgs e)
{
if (DownloadComplete != null)
DownloadComplete(this, e);
}
……
}
}

webbrowser控件有两个尚未公开的接口：attachinterfaces()和detachinterfaces()。这些方法用于获得iwebbrowser2接口的引用。
下一步，我们可以添加application属性。

/// <summary>
/// Returns the automation object for the web browser
/// </summary>
public object Application
{
get { return axIWebBrowser2.Application; }
}

这个属性可以用来创建一个新窗口，并且当创建新窗口事件触发时将浏览器重定向到这个新窗口。

作者： Edward

出处： http://umplatform.blog.51cto.com/
微博： 腾讯
Email: umplatform@126.com或 406590790@qq.com
QQ 交流：406590790 （请注明：平台交流）
QQ群交流：16653241 或 237326100

关于作者：高级工程师、信息系统项目管理师、数据库系统工程师。专注于微软平台项目架构、管理和企业解决方案，多年项目开发与管理经验，曾多次组织并开发多个大型项目，精通DotNet(C#、Asp.NET、ADO.NET、Web Service、WCF)，DB原理与技术、SqlServer、Oracle等。熟悉Java、Delhpi及Linux操作系统，有扎实的网络知识。自认在面向对象、面向服务以及数据库领域有一定的造诣。现主要从事DB管理、DB开发、WinForm、WCF、WebService、网页数据抓取以及ASP.NET等项目管理、开发、架构等工作。如有问题或建议，请多多赐教！

本文版权归作者和51CTO博客共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，如有问题，可以通过邮箱或QQ 联系我，非常感谢。

本文出自 “统一项目集成平台” 博客，请务必保留此出处http://umplatform.blog.51cto.com/5232570/960058