How to get current URL for chrome current version in C++

Question

i want to get URL from Google Chrome using the MSAA apis, i already found this on StackOverflow but i want to replicate this behaviour =>How to get current URL for chrome current version , without using AccessibleObjectFromEvent but with AccessibleObjectFromWindow. But after these lines:

    HRESULT hr = AccessibleObjectFromWindow(hwnd_addr_bar, OBJID_CLIENT, IID_IAccessible, (void **)&ac);



    if ((hr == S_OK ) && (ac!=NULL)){
        tagVARIANT state;
        VariantInit(&state);
        BSTR szAddressBox = NULL;
        HRESULT hr1 = ac->get_accValue(varchild, &szAddressBox);

    }

szAddressBox is empty. Where am i wrong?