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C++ 如何在C++；_C++_Google Chrome_Url_Hwnd_Iaccessible - Fatal编程技术网
Fatal编程技术网

C++ 如何在C++；

c++ google-chrome url

C++ 如何在C++；,c++,google-chrome,url,hwnd,iaccessible,C++,Google Chrome,Url,Hwnd,Iaccessible,我想使用MSAA API从Google Chrome获取URL，我已经在StackOverflow上找到了，但我想复制此行为=>，不使用AccessibleObjectFromEvent，而是使用AccessibleObjectFromWindow。 但在这几行之后： HRESULT hr = AccessibleObjectFromWindow(hwnd_addr_bar, OBJID_CLIENT, IID_IAccessible, (void **)&ac);

我想使用MSAA API从Google Chrome获取URL，我已经在StackOverflow上找到了，但我想复制此行为=>，不使用AccessibleObjectFromEvent，而是使用AccessibleObjectFromWindow。 但在这几行之后：

    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是空的。我错在哪里