IViewObject + SetAdvise Not Working

[LugPaj]

Hallo,

i am trying to get updates, when the view of a .net webbrowser control is updated. So i implemented the IViewObject of this one and tried to use setadvise, so that a function is called, when an update happened.

The interesting code is this:

IHTMLDocument2 htmlDocument = (IHTMLDocument2)this.webBrowser1.Document.DomDocument;
 
IViewObject ViewObject = htmlDocument as IViewObject;
 
if (ViewObject == null)
{
MessagheBox.Show("An error has occurred in initialization of the IViewObject of te WebBrowser.");
}
try
{
ViewObject.SetAdvise((int)DVASPECT.DVASPECT_CONTENT, 0, (IAdviseSink)this);
}
catch (Exception e_tmp)
{
MessageBox.Show(e_tmp.Message);
}
 

But this doesnt work. I dont get any error, it just doesnt delivers any calls, when the view of the webbrowser changed. Any

MessageBox.Show("ss"); part gets never called (look at bottom, implemention of the IAdviseSink)



Complete Example:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.InteropServices.ComTypes;
using System.Data;
using System.Drawing;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using mshtml;
namespace WindowsApplication3
{
[ComVisible(true), ComImport()]
[GuidAttribute("0000010d-0000-0000-C000-000000000046")]
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IViewObject
{
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int Draw(
//tagDVASPECT
[MarshalAs(UnmanagedType.U4)] UInt32 dwDrawAspect,
int lindex,
IntPtr pvAspect,
[In] IntPtr ptd,
//[MarshalAs(UnmanagedType.Struct)] ref DVTARGETDEVICE ptd,
IntPtr hdcTargetDev,
IntPtr hdcDraw,
[MarshalAs(UnmanagedType.Struct)] ref tagRECT lprcBounds,
[MarshalAs(UnmanagedType.Struct)] ref tagRECT lprcWBounds,
IntPtr pfnContinue,
[MarshalAs(UnmanagedType.U4)] UInt32 dwContinue);
void Freeze(
[MarshalAs(UnmanagedType.U4)] UInt32 dwDrawAspect,
int lindex,
IntPtr pvAspect,
out IntPtr pdwFreeze);
void Unfreeze(
[MarshalAs(UnmanagedType.U4)] int dwFreeze);
void SetAdvise
([MarshalAs(UnmanagedType.U4)] int aspects,
[MarshalAs(UnmanagedType.U4)] int advf,
[MarshalAs(UnmanagedType.Interface)] IAdviseSink pAdvSink);
void GetAdvise(
IntPtr paspects,
IntPtr advf,
[Out, MarshalAs(UnmanagedType.Interface)] out IAdviseSink pAdvSink);
}
 
 
public class Form1 : Form, IAdviseSink
{
public Form1()
{
this.webBrowser1 = new System.Windows.Forms.WebBrowser();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
// 
// webBrowser1
// 
this.webBrowser1.Location = new System.Drawing.Point(52, 96);
this.webBrowser1.MinimumSize = new System.Drawing.Size(20, 20);
this.webBrowser1.Name = "webBrowser1";
this.webBrowser1.Size = new System.Drawing.Size(339, 166);
this.webBrowser1.TabIndex = 0;
this.webBrowser1.Url = new System.Uri("http://www.heise.de",system.UriKind.Absolute);
// 
// button1
// 
 
this.button1.Location = new System.Drawing.Point(95, 45);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
// 
// Form1
// 
 
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(403, 266);
this.Controls.Add(this.button1);
this.Controls.Add(this.webBrowser1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
 
private System.Windows.Forms.WebBrowser webBrowser1;
private System.Windows.Forms.Button button1;
private void button1_Click(object sender, EventArgs e)
{
IHTMLDocument2 htmlDocument = (IHTMLDocument2)this.webBrowser1.Document.DomDocument;
IViewObject ViewObject = htmlDocument as IViewObject;
if (ViewObject == null)
{
MessageBox.Show("An error has occurred in initialization of the IViewObject of the WebBrowser.");
}
try
{
ViewObject.SetAdvise((int)DVASPECT.DVASPECT_CONTENT, 0, (IAdviseSink)this);
}
 
catch (Exception e_tmp)
{
MessageBox.Show(e_tmp.Message);
}
}
 
// Implementation of the IAdviseSink
public void OnDataChange(ref FORMATETC pFormat, ref STGMEDIUM pStg)
{
MessageBox.Show("ss");
}
 
public void OnViewChange(int dwAspect, int index)
{
MessageBox.Show("ss");
}
 
public void OnRename(IMoniker im)
{
MessageBox.Show("ss");
}
 
public void OnSave()
{
MessageBox.Show("ss");
}
 
public void OnClose()
{
MessageBox.Show("ss");
}
 
}
 
 
 
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}