Trouble with SDK function get_Location

Hello!
I'm using the itunes' SDK to develop an application using C++. Everything is fine, except the IITFileOrCDTrack object's get_Location() doesn't seem to work.
----snip----
iTunes *iITunes = 0;
iTTrack *iITrack = 0;
HRESULT hRes;
hRes = ::CoCreateInstance(CLSID_iTunesApp, NULL, CLSCTXLOCALSERVER, IID_IiTunes, (PVOID *)&iITunes);
if(hRes == S_OK && iITunes)
     iITunes->get_CurrentTrack(&iITrack);
     if(iITrack)
     BSTR bstrLocation = 0;
     IITFileOrCDTrack *iITFile = 0;
     iITFile = (IITFileOrCDTrack*)iITrack;
     iITFile->get_Location((BSTR *)&bstrLocation);
----snip----
I get an exception every time on the line that contains the call to get_Location().
Any help anyone here can provide would be much appreciated. If you have any sample code that at least proves this function does what is advertised in the API/SDK, I would be most appreciative.
Thanks in advance!

Unfortunately you can't just do this:
iITFile = (IITFileOrCDTrack*)iITrack;
That would be much too easy. You need to perform the cast through COM using the QueryInterface() method, like so:
IITFileOrCDTrack *pFileTrack = NULL;
iTrack->QueryInterface(IID_IITFileOrCDTrack, (void**)&pFileTrack);
if (pFileTrack != NULL)
pFileTrack->get_Location(&bstrLocation);
pFileTrack->Release();

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