What's wrong with this way of enumerating filters?

[Redeemer dk]

I've looked at the MSDN example, but the pEnum->Next function returns S_FALSE which means that the number of filters that were requested to be enumerated, wasn't enumerated.

IGraphBuilder *pGraph = NULL;
IEnumFilters *pEnum = NULL;
IBaseFilter *pFilter = NULL;
ULONG cFetched;
HRESULT err;

CoInitialize(NULL);
err = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder,(void**)&pGraph);
pGraph->EnumFilters(&pEnum);

while((err = pEnum->Next(1, &pFilter, &cFetched)) == S_OK)
{
FILTER_INFO fiFilterInfo;
char szFilterName[256];

pFilter->QueryFilterInfo(&fiFilterInfo);
WideCharToMultiByte(CP\_ACP, 0, fiFilterInfo.achName, -1, szFilterName, 256, 0, 0);
SendMessage(GetDlgItem(ghWnd, IDC\_FILTERS), LB\_INSERTSTRING, -1, (LPARAM)szFilterName);

fiFilterInfo.pGraph->Release();
pFilter->Release();

}

pEnum->Release();
pGraph->Release();
CoUninitialize();
}

All help is apprecaited! Thanks all :) -Rune Svendsen

[Joaquin M Lopez Munoz]

Try calling pEnum->Reset(); before enumerating. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

[Redeemer dk]

Didn't work :( thanks anyway man. -Rune SVendsen

[Joaquin M Lopez Munoz]

Wait... Seems you're constructing an IGraphBuilder and then enumerating its filters, but an empty IGraphBuilder won't have any. Try using for instance IGraphBuilder::RenderFile on some .avi prior to enumeration. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

[Redeemer dk]

Thankyou i'll try that. But do you know if there's a way to enumerate all the available filters on the current machine? -Rune Svendsen