IltmmConvert::GetSubObjectDispatch Example for C++

// This function checks if the Lens effect filter is available 
// and turns off the effect area (cropping feature) 
void TurnOffLensCropping(IltmmConvert *pConvert) 
{ 
   HRESULT hr; 
   IDispatch *pDisp = NULL; 
   ILMVLens *pLens = NULL; 
 
   // call the Convert object to retrieve the selected video processor 
   hr = pConvert->GetSubObjectDispatch(ltmmCapture_Object_SelVideoProcessor, &pDisp); 
   if(SUCCEEDED(hr)) 
   { 
      // see if the selected processor is the Lens Effect processor 
      hr = pDisp->QueryInterface(IID_ILMVLens, (void**)&pLens); 
      if(SUCCEEDED(hr)) 
      { 
         // disable the effect 
         pLens->put_EffectAreaEnabled(VARIANT_FALSE); 
 
         // release the object 
         pLens->Release(); 
      } 
 
      // release the sub object  
      pDisp->Release(); 
   } 
} 
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