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

   UMPLatForm.NET 中MiNiWeb浏览器核心技术详解二

 

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  
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