监控 WebBrowser 控件内容的改变

今天的收获只有一项，那就是这个啦。。。
呵呵， 主要的就是用到mshtml.IHTMLChangeSink 中的 Notify方法触发自定义的事件，具体的代码我也不懂，嘿嘿 这些都是从 东西市 Copy 来的，乱的成粥了。

  

   几点核心代码：



   public
    
   class
    Monitor : mshtml.IHTMLChangeSink
{
 
   //
    for monitor htmleditor textchanged
   

    
   private
    
   Guid IMarkupContainer2GUID 
   =
    
   typeof
   (mshtml.IMarkupContainer2).GUID;
　　　
 
   private
    
   uint
    cookie 
   =
    
   0
   ;

 
   private
    mshtml.IMarkupContainer2 markupContainer;

　　 
   private
    WebBrowser webBrowser;

　　　
   //
    Event
   

    
   public
    
   event
    Action HtmlEditorEvent;


　 
   public
    Monitor(WebBrowser webControl)

　　　{
　　　　　　
   this
   .webBrowser
   =
    webControl;
 }


 
   #region
    For HtmlEditor TextChanged
   
 
 
   //
    always monitor
   

    
   private
    mshtml.IMarkupContainer2 GetMarkupContainer()
 {
 
   object
    oDocument 
   =
    
   this
   .webBrowser.Document.DomDocument;

 IntPtr pDocument 
   =
    Marshal.GetIUnknownForObject(oDocument);

 IntPtr pMarkupContainer 
   =
    IntPtr.Zero;

 
   //
    pMarkupContainer is different after a call to Navigate or designMode
   

   
 Marshal.QueryInterface(pDocument, 
   ref
    IMarkupContainer2GUID, 
   out
    pMarkupContainer);

 
   //
   object oMarkupContainer = Marshal.GetObjectForIUnknown(pMarkupContainer); 
   //
    This does not work
   

   
 
   object
    oMarkupContainer 
   =
    Marshal.GetUniqueObjectForIUnknown(pMarkupContainer);

 Marshal.Release(pDocument);

 Marshal.Release(pMarkupContainer);

 
   return
    (mshtml.IMarkupContainer2)oMarkupContainer;

 }


 
   //
    only one monitor
   

    
   private
    mshtml.IMarkupContainer2 GetMarkupContainer2()
 {
 
   return
    (mshtml.IMarkupContainer2)
   this
   .webBrowser.Document.DomDocument;
 }


 
   public
    
   void
    MonitorTextChangedAlways()
 {
 
   this
   .markupContainer 
   =
    GetMarkupContainer();

 
   this
   .markupContainer.RegisterForDirtyRange((mshtml.IHTMLChangeSink)
   this
   , 
   out
    
   this
   .cookie);
 }


 
   public
    
   void
    StopMonitorTextChanged()
 {
 
   if
    (
   this
   .markupContainer 
   !=
    
   null
   )
 {
 
   this
   .markupContainer.UnRegisterForDirtyRange(
   this
   .cookie);
 }
 }

 
   #endregion
   


 
   #region
    Implement Interface
   

 
   public
    
   void
    Notify()
 {
 
   //
   触发改变事件外界去接受
   

    
   if
    (
   this
   .HtmlEditorEvent 
   !=
    
   null
   )
 {
 
   this
   .HtmlEditorEvent();
 }
 }

 
   #endregion
   


}