急死个人，进来看看吧，webbrowser

Question

STDMETHODIMP CSOActiveX::SetClientSite( IOleClientSite* aClientSite )
{
               HRESULT hr = IOleObjectImpl<CSOActiveX>::SetClientSite( aClientSite );
 
               if( !aClientSite )
               {
                               ATLASSERT( mWebBrowser2 );
                               if( mWebBrowser2 )
                                              AtlUnadvise( mWebBrowser2, DIID_DWebBrowserEvents2, mCookie );
                               return hr;
               }
 
               CComPtr<IOleContainer> aContainer;
               m_spClientSite->GetContainer( &aContainer );
               ATLASSERT( aContainer );
 
               if( SUCCEEDED( hr )  && aContainer )
               {
                               CComQIPtr<IServiceProvider, &IID_IServiceProvider> aServiceProvider( aContainer );
                               ATLASSERT( aServiceProvider );//这里出错
 
                               if( aServiceProvider )
                               {
                                              aServiceProvider->QueryService( SID_SInternetExplorer,
                                                                                                                                                                        IID_IWebBrowser,
                                                                                                                                                                        (void**)&mWebBrowser2 );
                                              ATLASSERT( mWebBrowser2 );
                                              if( mWebBrowser2 )
                                                             AtlAdvise( mWebBrowser2, GetUnknown(), DIID_DWebBrowserEvents2, &mCookie );
                               }
               }
 
               return hr;
}    

Answer 1

aServiceProvider这个服务端对象这个时候存在吗，检查一下这个对象的内存，是否被提前释放导致断言错误

Answer 2

有可能是 从aContainer 就queryinterface 你的IID_IServiceProvider吧，
你可以先用 CComPtr<IServiceProvider> 先建立这个对象，然后再queryinterface一下，看是否能正常获得。

Answer 3

如果是这样的话那 queryinterface 返回的 HRESULT 是 SUCCED 的吗？因为对于CComQIPtr 接口他自己内含 queryintface的，如果query 失败 那么就直接返回 NULL, 如果使用CComPtr 至少可以看到 query 返回的是什么原因代码 。