How to find out in which URL the browser is currently

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VC6

C++

Windows

MFC

Hi all! My program is for the capturing mouse behavior on the browsers(opera, IE, firefox, chrome). So I sat a global mouse hook, and now I know where the mouse pointer is , i.e. is the window under the mouse pointer a browser or not. So, when the click is caught on a browser I know the following:
1. browser window handle
2. the browser window process ID

the question is "how can I retrieve the URL in which the browser is?"

please, don't tell me "use SPY++" or something like that, because I've already tried to do that, but failed :(
Also I tried to call javascript "location.href", and... nothing usable (I know nothing in javascript.. maybe do something wrong)
and finally tried to use IWebBrowser2... but get_LocationURL returns an empty string. here is the code (for IE):

<br />
	IWebBrowser2 *pIwb;<br />
	OleInitialize( 0 );<br />
	CoCreateInstance( CLSID_InternetExplorer, NULL, CLSCTX_ALL,IID_IWebBrowser2, (void**)&pIwb );<br />
	if( pIwb )<br />
	{<br />
		VARIANT vEmpty;<br />
		VARIANT_BOOL bBusy = VARIANT_TRUE;<br />
		VariantInit( &vEmpty );<br />
<br />
		HINSTANCE hIEInstance = LoadLibrary( "atl.dll" );<br />
<br />
		AttachCtrl AtlAxAttachControl = (AttachCtrl)GetProcAddress( hIEInstance, "AtlAxAttachControl" );<br />
<br />
		HWND hWnd = ::GetForegroundWindow();<br />
		HRESULT hResult = AtlAxAttachControl( pIwb, hWnd , 0 );<br />
<br />
		CComBSTR bufferScript;<br />
		hResult = pIwb->get_LocationURL( &bufferScript );<br />
                /*hResult gets value 1 here*/<br />
<br />
		SysFreeString( bufferScript );<br />
<br />
		pIwb->Quit();<br />
		pIwb->Release();<br />
<br />
		FreeLibrary( hIEInstance );<br />
	}<br />

I hope somebody will provide me a piece of code, which will do this job