Problem is accessing frames within HTML document using IOleContain   

Hi,

I am trying to access the images rendered within frame or iframe in HTML web 
page using C#.Net.

I got one reference in this artical
http://support.microsoft.com/kb/196340 and tried the way that has been 
suggested 

----------------------------------------------------------------------------------------------
Guid guidIOleContainer = typeof(IOleContainer).GUID;

// Here oDoc is the mshtml.HTMLDocument object
IntPtr punk = Marshal.GetIUnknownForObject(oDoc); 

object iOleContainer = new object();

IntPtr ppvContainerIntPtr = Marshal.GetIUnknownForObject(iOleContainer);

//But this always fails
int hr = Marshal.QueryInterface(punk, ref guidIOleContainer, out 
ppvContainerIntPtr);

if (ppvContainerIntPtr != IntPtr.Zero)
{
     IOleContainer pOleContainer = 
(IOleContainer)Marshal.PtrToStructure(ppvContainerIntPtr, 	typeIOleContainer);

     Marshal.Release(punk);
                
      object[] objs = new object[10];

      pOleContainer.EnumObjects((int)tagOLECONTF.EMBEDDINGS, objs);

      IEnumUnknown pOleEnumObject = objs[0] as IEnumUnknown;

      MessageBox.Show(pOleEnumObject.ToString());
}
----------------------------------------------------------------------------------------------

But The problems are :
Marshal.QueryInterface for IoleContainer always fails.

How can I access the IOleContainer interface using doucment object in .net.

I have tried frames collection of HTMLDocumentClass but it is also not 
working.

Is there any other way to access document object of frames or Iframes.

Thanks,
Hetal

date: Sat, 5 Jul 2008 10:19:00 -0700   author:   Hetal