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Getting ADSI Interfaces From Your Extension

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An extension often needs to get data from the directory object it binds to. For example, an extension for a computer object may want to get the dnsHostName of the current object from the directory. This can be easily achieved by issuing a QueryInterface call on the IUnknown interface for the aggregator.

HRESULT hr;
IADs *pADs; ' ADSI Interface to get/set attributes.
 
hr = m_pOuterUnk->QueryInterface(IID_IADs,(void**)&pADs);
 
if ( SUCCEEDED(hr) )
{
    VARIANT var;
    VariantInit(&var);
    hr  = pADs ->Get(_bstr_t("dnsHostName"), &var);
    if ( SUCCEEDED(hr) )
    { 
        printf("%S\n", V_BSTR(&var));
    }
    VariantClear(&var);
    pADs->Release();
}

You should release the interface immediately after using it. If the extension has an open reference to the aggregator, you have created a circular reference and the aggregator cannot release the extension. Therefore, the aggregator cannot be released and the result is memory leaks in your application.