HRESULT STDMETHODCALLTYPE CAAFEssenceDescriptor::GetLocatorAt (aafUInt32 index, IAAFLocator ** ppLocator) { HRESULT hr; ImplAAFEssenceDescriptor * ptr; ImplAAFRoot * pO; pO = GetRepObject (); assert (pO); ptr = static_cast<ImplAAFEssenceDescriptor*> (pO); assert (ptr); // // set up for ppLocator // ImplAAFLocator * internalppLocator = NULL; ImplAAFLocator ** pinternalppLocator = NULL; if (ppLocator) { pinternalppLocator = &internalppLocator; } try { hr = ptr->GetLocatorAt (index, pinternalppLocator); } catch (OMException& e) { // OMExceptions should be handled by the impl code. However, if an // unhandled OMException occurs, control reaches here. We must not // allow the unhandled exception to reach the client code, so we // turn it into a failure status code. // // If the OMException contains an HRESULT, it is returned to the // client, if not, AAFRESULT_UHANDLED_EXCEPTION is returned. // hr = OMExceptionToResult(e, AAFRESULT_UNHANDLED_EXCEPTION); } catch (OMAssertionViolation &) { // Control reaches here if there is a programming error in the // impl code that was detected by an assertion violation. // We must not allow the assertion to reach the client code so // here we turn it into a failure status code. // hr = AAFRESULT_ASSERTION_VIOLATION; } catch (...) { // We CANNOT throw an exception out of a COM interface method! // Return a reasonable exception code. // hr = AAFRESULT_UNEXPECTED_EXCEPTION; } // // cleanup for ppLocator // if (SUCCEEDED(hr)) { IUnknown *pUnknown; HRESULT hStat; if (internalppLocator) { pUnknown = static_cast<IUnknown *> (internalppLocator->GetContainer()); hStat = pUnknown->QueryInterface(IID_IAAFLocator, (void **)ppLocator); assert (SUCCEEDED (hStat)); //pUnknown->Release(); internalppLocator->ReleaseReference(); // We are through with this pointer. } } return hr; }