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

Posted on 2002-04-28
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Last Modified: 2013-11-20
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;
}
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Question by:iProgram
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2 Comments
 
LVL 12

Accepted Solution

by:
migel earned 400 total points
ID: 6974817
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
 
LVL 1

Author Comment

by:iProgram
ID: 6974849
Yes, it works
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