FilterInfor()

This can show the list of connected filter by Graph Manager in DirectShow.

void TraceFilterInfo()
{
 IEnumFilters *pIEnumFilters = NULL;
 HRESULT hRes = S_OK;
 hRes = m_pGraph->EnumFilters(&pIEnumFilters);
 
 IBaseFilter *pIBaseFilter_Enum = NULL;
 CLSID clsid;
 FILTER_INFO filter_info;
 ULONG ulHowManyPins = 0;

 while (hRes ==S_OK)
 {
  hRes = pIEnumFilters->Next(1, &pIBaseFilter_Enum, 0);
  pIBaseFilter_Enum->GetClassID(&clsid);
  pIBaseFilter_Enum->QueryFilterInfo(&filter_info);

  TRACE(L"%s\n", filter_info.achName);
 
  if(hRes == S_OK)
  {
   //When we find one　　　... loop through it's pins.
   HRESULT hRes2 = S_OK;
   IEnumPins *pIEnumPins = NULL;
   IPin *pIPin = NULL;

   PIN_DIRECTION pin_direction;
   bool locHasOutputs = false;
   hRes2 = pIBaseFilter_Enum->EnumPins(&pIEnumPins);

   if(hRes2 == S_OK)
   {
    while(hRes2 == S_OK)
    {
     //Loop through the pins.
     hRes2 = pIEnumPins->Next(1, &pIPin, &ulHowManyPins);
     TRACE(L"--- Pin Numbers : %d, ", ulHowManyPins);

     if(hRes2 == S_OK)
     {
      pIPin->QueryDirection(&pin_direction);
      PIN_INFO pin_info;
      pIPin->QueryPinInfo(&pin_info);

      TRACE(L"%s\n", pin_info.achName);

      if (pin_direction == PINDIR_OUTPUT)
      {
       //Has an output pin... can't be a renderer, break out of the pin loop.
       locHasOutputs = true;
       break;
      }
     }
     else
      TRACE(L"\n");
    }
   
    if(!locHasOutputs)
    {
     //Renderer filter here. Remove it from the graph.
      // hRes2 = m_pGraph->RemoveFilter(pIBaseFilter_Enum);
     //Break out of the filter loop.
     //break;
    }
   }
  }
 
  pIBaseFilter_Enum->Release();
 }

 pIEnumFilters->Release();
}