Question

BHO: Navigate to a different URL in BeforeNavigate2 event

Asked by: Cool-Guy

I have developed a simple add-on for IE using the example available at:
http://msdn.microsoft.com/en-gb/library/bb250489(VS.85).aspx

I am using BeforeNavigate2 event instead of DocumentComplete Event in the example.

Here, I read the URL that is trying to get opened. If the domain is "www.google.com", I am trying to change the URL to "www.experts-exchange.com". I am not able to find out a way of changing the existing URL and open it. I have attached a few lines of my code. Kindly have a look and guide me on how to proceed.

ps: I am a C++ programmer and ATL/COM is completely new to me. So please give your suggestions with sample code.

BEGIN_SINK_MAP(CIEPluginBHO)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_BEFORENAVIGATE2, OnBeforeNavigate2)
END_SINK_MAP()
 
    // DWebBrowserEvents2
  void STDMETHODCALLTYPE OnBeforeNavigate2(IDispatch* pDisp, VARIANT* URL, 
  VARIANT* pvtFlags,
  VARIANT* pvtTargetFrameName, 
  VARIANT* pvtPostData, 
  VARIANT* pvtHeaders,
  VARIANT_BOOL* pvbCancel);
 
 
/// In my cpp file
 
void STDMETHODCALLTYPE CIEPluginBHO::OnBeforeNavigate2(IDispatch* pDisp,
  VARIANT* URL,
  VARIANT* Flags,
  VARIANT* TargetFrameName, 
  VARIANT* PostData, 
  VARIANT* Headers,
  VARIANT_BOOL* Cancel)
{
	static TCHAR searchText[] = _T("www.google.com");
	CString currentURL(URL->bstrVal);
	if (currentURL.Find(searchText) != -1)
	{
				
	}
}

                                  
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Asked On
2009-02-17 at 04:20:16ID24149686
Tags

IE

,

BHO

,

plugin

,

BeforeNavigate2

,

add on

Topics

Windows ATL / WTL / COM Programming

,

Plug Ins

,

Windows Programming

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: alb66Posted on 2009-02-17 at 23:47:35ID: 23667746

it should be:

if (currentURL.Find(searchText) != -1)
{
    // Query for the IWebBrowser2 interface.
    CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp;
    spTempWebBrowser .Navigate2( "www....

 

by: Cool-GuyPosted on 2009-02-23 at 22:18:07ID: 23718729

I added the following:
if (currentURL.Find(searchText) == -1)
{
        // Query for the IWebBrowser2 interface.
       CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp;
      CComVariant vURL(L"http://www.google.com");

      spTempWebBrowser->Navigate2(&vURL, NULL,NULL,NULL,NULL);            
}

IE fails to open when the plugin registers for the above code. When I comment out "spTempWebBrowser->Navigate2" statement, IE opens i.e.
if (currentURL.Find(searchText) == -1)
{
        // Query for the IWebBrowser2 interface.
       CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp;
      CComVariant vURL(L"http:/www.experts-exchange.com");

//     spTempWebBrowser->Navigate2(&vURL, NULL,NULL,NULL,NULL);            
}

 

by: Cool-GuyPosted on 2009-03-01 at 21:50:23ID: 23771773

This worked:

if (currentURL.Find(searchText) != -1)
	{
		// Query for the IWebBrowser2 interface.
		CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp;
		CComVariant vURL("http://www.experts-exchange.com");
		CComVariant vNull;	
		vNull.vt = VT_NULL;
		spTempWebBrowser->Stop();
		spTempWebBrowser->Navigate2(&vURL, &vNull, &vNull, &vNull, &vNull);		
	}

                                              
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by: Cool-GuyPosted on 2009-03-01 at 21:54:50ID: 31547733

Thanks

20120131-EE-VQP-002

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