How to set the first parameter of URLDownlofToFIle() in ATL ActiveX?

Hi experts,

I want to use URLDownloadToFile function in an ATL project. From MSDN, the first parameter should be "Address of the controlling IUnknown interface of the calling ActiveX component"
So, my question is how to get this IUnknown ?

codes:
STDMETHODIMP CTestATL::OnTest(IDispatch *pdisp)
{
    .....
    ::URLDownloadToFile(???,"http://www.msn.com/index.htm","C:\\1.htm",callback_function);
    .....
    return S_OK;
}
LVL 1
iProgramAsked:
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migelConnect With a Mentor Commented:
Hi!
You can safely pass NULL as the first parameter.
You can also get your ActiveX IUnknown pointer:
that is:

STDMETHODIMP CTestATL::OnTest(IDispatch *pdisp)
{
     CComPtr<IUnknown> punk1;
     QueryInterface(IID_IUnknown, (void**)&punk1);        ::URLDownloadToFile(punk1,"http://www.msn.com/index.htm","C:\\1.htm",callback_function);
   .....
   return S_OK;
}
0
 
iProgramAuthor Commented:
Yes, it works
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