webbrowser 控件自定义出现的问题

2012-06-05 09:49:13 230 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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http://stackoverflow.com/questions/7608550/implement-idispatchinvoke-to-be-called-by-a-webbrowser-control

我最近在做一个小浏览器，要实现禁止下载图片和视频的功能。按照stackoverflow （见上链接）的做法，用反射调用Idispatch，可以达到目的。但问题是，浏览器的刷新，前进和后退方法：Refresh(),goBack(),goForward()都不起作用了。。。。

有高手知道为什么吗？

请不吝赐教

...全文

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whqjj2006 2012-06-05

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代码贴出来了，欢迎测试

whqjj2006 2012-06-05

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 public class WebBrowser1 : WebBrowser

  {

      private const int DISPID_AMBIENT_DLCONTROL = -5512;

      private int _controlFlags;



      protected override WebBrowserSiteBase CreateWebBrowserSiteBase()

      {

          return new WebBrowserSite1(this);

      }



      [DispId(DISPID_AMBIENT_DLCONTROL), Browsable(false)]

      public int ControlFlags

      {

          get

          {

              return _controlFlags;

          }

          set

          {

              if (_controlFlags == value)

                  return;



              _controlFlags = value;



              IOleControl ctl = (IOleControl)ActiveXInstance;

              ctl.OnAmbientPropertyChange(DISPID_AMBIENT_DLCONTROL);

          }

      }



      // we want our site class, not the default one

      protected class WebBrowserSite1 : WebBrowserSite, IReflect

      {

          private Dictionary<int, PropertyInfo> _dispidCache;

          private WebBrowser1 _host;



          public WebBrowserSite1(WebBrowser1 host)

              : base(host)

          {

              _host = host;

          }



          object IReflect.InvokeMember(string name, BindingFlags invokeAttr, Binder binder, object target, object[] args, ParameterModifier[] modifiers, CultureInfo culture, string[] namedParameters)

          {

              object ret = null;

              // Check direct IDispatch call using a dispid (see http://msdn.microsoft.com/en-us/library/de3dhzwy.aspx)

              const string dispidToken = "[DISPID=";

              if (name.StartsWith(dispidToken))

              {

                  int dispid = int.Parse(name.Substring(dispidToken.Length, name.Length - dispidToken.Length - 1));

                  if (_dispidCache == null)

                  {

                      // WebBrowser has many properties, so we build a dispid cache on it

                      _dispidCache = new Dictionary<int, PropertyInfo>();

                      foreach (PropertyInfo pi in _host.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance))

                      {

                          if ((!pi.CanRead) || (pi.GetIndexParameters().Length > 0))

                              continue;



                          object[] atts = pi.GetCustomAttributes(typeof(DispIdAttribute), true);

                          if ((atts != null) && (atts.Length > 0))

                          {

                              DispIdAttribute da = (DispIdAttribute)atts[0];

                              _dispidCache[da.Value] = pi;

                          }

                      }

                  }



                  PropertyInfo property;

                  if (_dispidCache.TryGetValue(dispid, out property))

                  {

                      ret = property.GetValue(_host, null);

                  }

              }

              return ret;

          }



          FieldInfo[] IReflect.GetFields(BindingFlags bindingAttr)

          {

              return this.GetType().GetFields(bindingAttr);

          }



          MethodInfo[] IReflect.GetMethods(BindingFlags bindingAttr)

          {

              return this.GetType().GetMethods(bindingAttr);

          }



          PropertyInfo[] IReflect.GetProperties(BindingFlags bindingAttr)

          {

              return this.GetType().GetProperties(bindingAttr);

          }



          FieldInfo IReflect.GetField(string name, BindingFlags bindingAttr)

          {

              throw new NotImplementedException();

          }



          MemberInfo[] IReflect.GetMember(string name, BindingFlags bindingAttr)

          {

              throw new NotImplementedException();

          }



          MemberInfo[] IReflect.GetMembers(BindingFlags bindingAttr)

          {

              throw new NotImplementedException();

          }



          MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr)

          {

              throw new NotImplementedException();

          }



          MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr, Binder binder, Type[] types, ParameterModifier[] modifiers)

          {

              throw new NotImplementedException();

          }



          PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers)

          {

              throw new NotImplementedException();

          }



          PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr)

          {

              throw new NotImplementedException();

          }



          Type IReflect.UnderlyingSystemType

          {

              get { throw new NotImplementedException(); }

          }



      }



    [Flags]

      public enum AbBrowserDownloadControlFlags : int

      {

          /// <summary>

          /// No flags are set.

          /// </summary>

          None = 0,

          /// <summary>

          /// The browser will operate in offline mode. Equivalent to DLCTL_FORCEOFFLINE.

          /// </summary>

          AlwaysOffline = unchecked((int)0x10000000),

          /// <summary>

          /// The browser will play background sounds. Equivalent to DLCTL_BGSOUNDS.

          /// </summary>

          BackgroundSounds = unchecked((int)0x00000040),

          /// <summary>

          /// Specifies that the browser will not run Active-X controls. Use this setting

          /// to disable Flash movies. Equivalent to DLCTL_NO_RUNACTIVEXCTLS.

          /// </summary>

          DontRunActiveX = unchecked((int)0x00000200),

          /// <summary>

          ///  Specifies that the browser should fetch the content from the server. If the server's

          ///  content is the same as the cache, the cache is used.Equivalent to DLCTL_RESYNCHRONIZE.

          /// </summary>

          IgnoreCache = unchecked((int)0x00002000),

          /// <summary>

          ///  The browser will force the request from the server, and ignore the proxy, even if the

          ///  proxy indicates the content is up to date.Equivalent to DLCTL_PRAGMA_NO_CACHE.

          /// </summary>

          IgnoreProxy = unchecked((int)0x00004000),

          /// <summary>

          ///  Specifies that the browser should download and display images. This is set by default.

          ///  Equivalent to DLCTL_DLIMAGES.

          /// </summary>

          Images = unchecked((int)0x00000010),

          /// <summary>

          ///  Disables downloading and installing of Active-X controls.Equivalent to DLCTL_NO_DLACTIVEXCTLS.

          /// </summary>

          NoActiveXDownload = unchecked((int)0x00000400),

          /// <summary>

          ///  Disables web behaviours.Equivalent to DLCTL_NO_BEHAVIORS.

          /// </summary>

          NoBehaviours = unchecked((int)0x00008000),

          /// <summary>

          ///  The browser suppresses any HTML charset specified.Equivalent to DLCTL_NO_METACHARSET.

          /// </summary>

          NoCharSets = unchecked((int)0x00010000),

          /// <summary>

          ///  Indicates the browser will ignore client pulls.Equivalent to DLCTL_NO_CLIENTPULL.

          /// </summary>

          NoClientPull = unchecked(0x20000000),

          /// <summary>

          ///  The browser will not download or display Java applets.Equivalent to DLCTL_NO_JAVA.

          /// </summary>

          NoJava = unchecked((int)0x00000100),

          /// <summary>

          ///  The browser will download framesets and parse them, but will not download the frames

          ///  contained inside those framesets.Equivalent to DLCTL_NO_FRAMEDOWNLOAD.

          /// </summary>

          NoFrameDownload = unchecked((int)0x00080000),

          /// <summary>

          ///  The browser will not execute any scripts.Equivalent to DLCTL_NO_SCRIPTS.

          /// </summary>

          NoScripts = unchecked((int)0x00000080),

          /// <summary>

          ///  If the browser cannot detect any internet connection, this causes it to default to

          ///  offline mode.Equivalent to DLCTL_OFFLINEIFNOTCONNECTED.

          /// </summary>

          OfflineIfNotConnected =unchecked((int)0x80000000),

          /// <summary>

          ///  Specifies that UTF8 should be used.Equivalent to DLCTL_URL_ENCODING_ENABLE_UTF8.

          /// </summary>

          UTF8 = unchecked((int)0x00040000),

          /// <summary>

          ///  The browser will download and display video media.Equivalent to DLCTL_VIDEOS.

          /// </summary>

          Videos = unchecked((int)0x00000020)

      }

}

whqjj2006 2012-06-05

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楼上没看明白我的意思，我已经实现了，但这种方法会导致刷新，前进后退等方法失效。。。。

devmiao 2012-06-05

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public enum WebBrowserDownloadControlFlags: uint { DLIMAGES = 0x00000010, VIDEOS = 0x00000020, BGSOUNDS = 0x00000040, NO_SCRIPTS = 0x00000080, NO_JAVA = 0x00000100, NO_RUNACTIVEXCTLS = 0x00000200, NO_DLACTIVEXCTLS = 0x00000400, DOWNLOADONLY = 0x00000800, NO_FRAMEDOWNLOAD = 0x00001000, RESYNCHRONIZE = 0x00002000, PRAGMA_NO_CACHE = 0x00004000, NO_BEHAVIORS = 0x00008000, NO_METACHARSET = 0x00010000, URL_ENCODING_DISABLE_UTF8 = 0x00020000, URL_ENCODING_ENABLE_UTF8 = 0x00040000, NOFRAMES = 0x00080000, FORCEOFFLINE = 0x10000000, NO_CLIENTPULL = 0x20000000, SILENT = 0x40000000, OFFLINEIFNOTCONNECTED = 0x80000000, OFFLINE = OFFLINEIFNOTCONNECTED, }

根据这个标志位表设置你需要屏蔽的功能。

webbrowser 控件自定义出现的问题

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