ATL / WTL / STL

// #define _WIN32_IE 0x0400    // IHTMLDocument2
#define _WIN32_IE 0x0550    // IHTMLDocument2
#define _WIN32_DCOM         // CoInitializeEx(...)

#pragma warning( disable: 4146 )
#pragma warning( disable: 4192 )
#  import "mshtml.tlb"    // guids
#pragma warning( default: 4146 )
#pragma warning( default: 4192 )

#include <windows.h>

#include <atlbase.h>    // CComPtr<>, CoInitializeEx, etc
#include <mshtml.h>     // MSHTML Object and Interfaces
#include <assert.h>

#include <iostream>

int main(int argc, char* argv[])
{
    HRESULT hr = S_OK; 

    CComPtr< MSHTML::IHTMLDocument2 > Document = NULL;
    CComPtr< MSHTML::IHTMLLocation >  Location = NULL;

    hr = CoInitializeEx( NULL, COINIT_MULTITHREADED  );
    if( FAILED( hr ) ) { goto COMPLETE; }

    hr = Document.CoCreateInstance(CLSID_HTMLDocument);
    if( FAILED( hr ) ) { goto COMPLETE; }
<BR>
    hr = Location.CoCreateInstance(CLSID_HTMLLocation);
    if( FAILED( hr ) ) { goto COMPLETE; }

    // hr = Document->get_location( &Location );
    // if( FAILED( hr ) ) { goto COMPLETE; }

    // std::wcout << L"Document URL: " << (wchar_t*)pLocation->toString() << std::endl;

COMPLETE:

    // Smart pointers are not always very smart
    //  Destroy these objects before
    //  CoUninitialize() is invoked
    // CComPtr<> outlives the apartment
    //   created by CoInitializeEx(). 
    Document.Release();
    Location.Release();

    CoUninitialize( );

    if( S_OK != hr )
    {
        std::wcout << L"COM Error: " << std::hex << L"0x" <<hr;
        std::wcout << L" (Win32: " << std::dec << HRESULT_CODE( hr );
        std::wcout << L")" << std::endl;
    }

    return HRESULT_CODE( hr );
}