GetToc Function for Generating a Table of Contents

The following function is a helper function in an example program that is discussed in Generating a Table of Contents Automatically.

HRESULT GetToc(IDMOWrapperFilter* pWrap, IToc** ppToc)
{
   IPropertyStore* pStore = NULL;
   HRESULT  hr = pWrap->QueryInterface(IID_IPropertyStore, (VOID**)&pStore);

   if(SUCCEEDED(hr))
   {
      PROPVARIANT pv;
      PropVariantInit(&pv);

      pv.vt = VT_BOOL;
      pv.bVal = VARIANT_TRUE;                                                     
      hr = pStore->SetValue(MFPKEY_TOCGENERATOR_ENDSIGNAL, pv);

      if(SUCCEEDED(hr))
      {
         for(LONG j = 0; j < 10; ++j)
         {
            PropVariantClear(&pv);
            pv.vt = VT_BOOL;
            hr = pStore->GetValue(MFPKEY_TOCGENERATOR_TOCREADY, &pv);

            if(SUCCEEDED(hr) && 1 == pv.bVal)  // Note: 1 is not equal to VARIANT_TRUE.
            {
               PropVariantClear(&pv);
               pv.vt = VT_UNKNOWN;
               hr = pStore->GetValue(MFPKEY_TOCGENERATOR_TOCOBJECT, &pv);

               if(SUCCEEDED(hr))
               {
                  *ppToc = (IToc*)pv.punkVal;
               }

               break;
            }

            Sleep(200);
            hr = ERROR_TIMEOUT;       
         }
      }

      pStore->Release();
      pStore = NULL;
   }
   
   return hr;
}

See Also

Generating a Table of Contents Automatically

Send comments about this topic to Microsoft

Build date: 4/7/2010