Does Visual J# supports Browser Helper Objects(BHO)

Does Visual J# supports Browser Helper Objects(BHO)

• Eric Wohlstadter

  Hi,
  i have done as u told but it doesnot throw any message box after it have loaded any page.Thanks for ur support by providing useful guidelines in this conversation.
  
  regards
  praveen
  
  

• Baumbart

  Hi Praveen,

  I just changed the DocumentCompleteEventHandler to DownloadCompleteEventHandler. DownloadCompleteEventHandler doest not use /**@ref*/. I am pasting the changed code. Hope this will work for you.

  import System.*;

  import System.Collections.Generic.*;

  import System.Text.*;

  import System.Runtime.InteropServices.*;

  import Microsoft.Win32.*;

  import mshtml.*;

  import SHDocVw.*;

  /**@attribute ComVisible(true),ClassInterfaceAttribute(ClassInterfaceType.None),GuidAttribute("D5423C28-959D-4909-BB9B-431286B62483")*/

  public class samplebho implements IObjectWithSite

  {

  WebBrowser browser;

  #region IObjectWithSite Members

  public void SetSite(Object site)

  {

  if (site == null)

  {

  browser.add_DownloadComplete(new DWebBrowserEvents2_DownloadCompleteEventHandler(this.browser_DownloadComplete));

  browser = null;

  }

  else

  {

  browser = (WebBrowser)site;

  browser.add_DownloadComplete(new DWebBrowserEvents2_DownloadCompleteEventHandler(this.browser_DownloadComplete));

  }

  return;

  }

  public void GetSite(/**@ref */ Guid guid, Object ppvSite)

  {

  ppvSite = browser;

  return;

  }

  #endregion

  #region events

  //private void browser_DownloadComplete(Object pDisp, /**@ref */ Object URL)

  private void browser_DownloadComplete()

  {

  //HTMLDocumentClass doc = (HTMLDocumentClass)browser.get_Document();

  //System.Windows.Forms.MessageBox.Show("Page size is "+ doc.get_fileSize().toString());

  System.Windows.Forms.MessageBox.Show("Download completed");

  }

  #endregion

  #region registry commands

  /**@attribute ComRegisterFunction()*/

  public static void RegisterBHO(Type t)

  {

  RegistryKey rk = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects", true);

  rk.CreateSubKey("{" + t.get_GUID().ToString() + "}");

  }

  /**@attribute ComUnregisterFunction()*/

  public static void UnregisterBHO(Type t)

  {

  RegistryKey rk = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects", true);

  rk.DeleteSubKey("{" + t.get_GUID().ToString() + "}");

  }

  #endregion

  }

  #region interfaces

  /**@attribute ComImportAttribute()*/

  /**@attribute InterfaceType(ComInterfaceType.InterfaceIsIUnknown)*/

  /**@attribute GuidAttribute("FC4801A3-2BA9-11CF-A229-00AA003D7352")*/

  public interface IObjectWithSite

  {

  void SetSite(/** @attribute MarshalAsAttribute(UnmanagedType.IUnknown)*/ Object pUnkSite);

  void GetSite(/**@ref */ Guid riid, /** @attribute MarshalAsAttribute(UnmanagedType.IUnknown)*/ Object ppvSite);

  }

  #endregion

  
  

• bri189a

  Hi Noorul,
  Now the code gets compiled without any error and i am able to sign the dll and registered it using regasm.But when i open the Internet Explorer,it crashes displaying
  "Internet Explorer has encountered a problem and needs to close. We are sorry for the inconvenience."
  I am using IE version 6 sp2.
  After that i register the assembly with strong name.exe and it also loads and IE opens as usual.BUt no output is seen.
  Could u tell what would be the ouput ,when opening the IE.Since i did not see any kind of it.
  
  Thanks
  Praveen
  
  

• paveyard

  Hi Praveen,

  For this error D:\Documents and Settings\Administrator\My Documents\Visual Studio Projects\sample\samplebho.jsl(77,0): error VJS1220: Cannot resolve name 'System.Windows.Forms.MessageBox'

  Please reference System.windows.forms.dll.

  Reason for the remaining error is /**ref*/ is not supported in VJ# 2003. The same code works fine VJ#2005. Pass by reference is not supported VJ# 2003.

  I will suggest to use VJ# 2005.

  Thanks,

  Noorul Ameen.

  
  

• Carles Viaplana

  Hi,

  After registering the dll go to any one of the website (ex-www.yahoo.com) after the page downloaded completely, a message box will appear with the message "Download completed".

  Thanks,

  Noorul Ameen.

  
  

• Eric Kiersky

  Hi Noorul,
  thanks for the code that u sent in vj#.The thing now is,it throws some error during building the project. The errors are
  
  D:\Documents and Settings\Administrator\My Documents\Visual Studio Projects\sample\samplebho.jsl(35,29): error VJS1425: Signature of method 'browser_DocumentComplete' doesn't match with the signature of 'SHDocVw.DWebBrowserEvents2_DocumentCompleteEventHandler' Delegate
  
  D:\Documents and Settings\Administrator\My Documents\Visual Studio Projects\sample\samplebho.jsl(47,29): error VJS1425: Signature of method 'browser_DocumentComplete' doesn't match with the signature of 'SHDocVw.DWebBrowserEvents2_DocumentCompleteEventHandler' Delegate
  
  D:\Documents and Settings\Administrator\My Documents\Visual Studio Projects\sample\samplebho.jsl(77,0): error VJS1220: Cannot resolve name 'System.Windows.Forms.MessageBox'
  
  D:\Documents and Settings\Administrator\My Documents\Visual Studio Projects\sample\samplebho.jsl(75,0): warning VJS1512: Variable 'doc' is initialized but never used
  
  Build complete -- 3 errors, 1 warnings
  Building satellite assemblies...
  Satellite assemblies could not be built because the main project output is missing.
  
  
  i have also added both the reference shdoccvw.dll and microsoft.mshtml.dll.Besides whether any other reference should be made or not to build sucessfully.
  
  thanks
  praveen
  
  

• Ramanuj kumar

  Hi Praveen ,

  All BHO application should implement the following interface.

  public interface IObjectWithSite

  {

  void SetSite(/** @attribute MarshalAsAttribute(UnmanagedType.IUnknown)*/ Object pUnkSite);

  void GetSite(/**@ref */ Guid riid, /** @attribute MarshalAsAttribute(UnmanagedType.IUnknown)*/ Object ppvSite);

  }

  In the above interface GetSite function expects " /**@ref */ Guid riid " as argument.

  The reason for the ie crash is @ref is not supported in VJ# 2003. It will work fine in VJ# 2005.

  So I suspect that this scenario is not supported in VJ# 2003.

  Thanks,

  Noorul Ameen.

  
  

• Richard Michaels

  Hi Praveen,

  BHO is supported in VJ#. I have done a small example.

  Create a new VJ# classlibrary project named sample.Add reference to the folllowing dlls from visual studio IDE.

  C:\Program Files\Microsoft.NET\Primary Interop Assemblies\Microsoft.mshtml.dll

  C:\Windows\System32\shdocvw.dll

  copy the following code and paste it class1.jsl

  Compile the project. the sample.dll will be in bin/debug folder.

  Register the sample.dll using regasm /codebase sample.dll from visual studio commandpromt.

  now open some website and message box will show the size of the page.

  To unregister the sample.dll use regasm /unregister sample.dll

  import System.*;

  import System.Collections.Generic.*;

  import System.Text.*;

  import System.Runtime.InteropServices.*;

  import Microsoft.Win32.*;

  import mshtml.*;

  import SHDocVw.*;

  /**@attribute ComVisible(true),ClassInterfaceAttribute(ClassInterfaceType.None),GuidAttribute("D5423C28-959D-4909-BB9B-431286B62483")*/

  public class samplebho implements IObjectWithSite

  {

  WebBrowser browser;

  #region IObjectWithSite Members

  public void SetSite(Object site)

  {

  if (site == null)

  {

  browser.add_DocumentComplete(new DWebBrowserEvents2_DocumentCompleteEventHandler(this.browser_DocumentComplete));

  browser = null;

  }

  else

  {

  browser = (WebBrowser)site;

  browser.add_DocumentComplete(new DWebBrowserEvents2_DocumentCompleteEventHandler(browser_DocumentComplete));

  }

  return;

  }

  public void GetSite(/**@ref */ Guid guid, Object ppvSite)

  {

  ppvSite = browser;

  return;

  }

  #endregion

  #region events

  void browser_DocumentComplete(Object pDisp, /**@ref */ Object URL)

  {

  HTMLDocumentClass doc = (HTMLDocumentClass)browser.get_Document();

  System.Windows.Forms.MessageBox.Show("Page size is "+ doc.get_fileSize().toString());

  }

  #endregion

  #region registry commands

  /**@attribute ComRegisterFunction()*/

  public static void RegisterBHO(Type t)

  {

  RegistryKey rk = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects", true);

  rk.CreateSubKey("{" + t.get_GUID().ToString() + "}");

  }

  /**@attribute ComUnregisterFunction()*/

  public static void UnregisterBHO(Type t)

  {

  RegistryKey rk = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects", true);

  rk.DeleteSubKey("{" + t.get_GUID().ToString() + "}");

  }

  #endregion

  }

  #region interfaces

  /**@attribute ComImportAttribute()*/

  /**@attribute InterfaceType(ComInterfaceType.InterfaceIsIUnknown)*/

  /**@attribute GuidAttribute("FC4801A3-2BA9-11CF-A229-00AA003D7352")*/

  public interface IObjectWithSite

  {

  void SetSite(/** @attribute MarshalAsAttribute(UnmanagedType.IUnknown)*/ Object pUnkSite);

  void GetSite(/**@ref */ Guid riid, /** @attribute MarshalAsAttribute(UnmanagedType.IUnknown)*/ Object ppvSite);

  }

  #endregion

  For more information on BHO visit http://msdn.microsoft.com/library/default.asp url=/library/en-us/dnwebgen/html/bho.asp

  Thanks,

  Noorul Ameen.

  
  

• Christian Liensberger - INACTIVE

  Hi Noorul
  Whether it is possible to implement the codes in vj#2003 to work.But not your example code that you gave,instead a new code that can work in VJ 2003 also.
  If so what are modifications that needs to changed.
  
  
  thanks
  Praveen
  
  
  
• Does Visual J# supports Browser Helper Objects(BHO)