Retrieving the Filter

To instantiate ActiveGige Video Capture Filter, you need to enumerate all video capture filters using the system device enumerator and match the filter name with "GigE Vision compliant camera":


IBaseFilter* pFilter;
HRESULT hr;

//locate the camera filter using system device enumerator
CComPtr< ICreateDevEnum > pCreateDevEnum;
pCreateDevEnum.CoCreateInstance( CLSID_SystemDeviceEnum );
if( !pCreateDevEnum )
return E_FAIL;
// enumerate video capture devices
CComPtr< IEnumMoniker > pEm;
pCreateDevEnum->CreateClassEnumerator( CLSID_VideoInputDeviceCategory, &pEm, 0 );
if( !pEm )
return E_FAIL;

pCreateDevEnum.Release();
pEm->Reset();
int noCapDevice=0;

while(true)
{
ULONG ulFetched = 0;
CComPtr< IMoniker > pM;
hr = pEm->Next( 1, &pM, &ulFetched );
if( hr != S_OK )
break;
//get the property bag interface from the moniker
CComPtr< IPropertyBag >pBag;
hr = pM->BindToStorage( 0, 0, IID_IPropertyBag, (void**)&pBag );
if( hr != S_OK )
{
pBag.Release();
continue;
}

//retrieve the name of the device
CComVariant var;
var.vt = VT_BSTR;
hr = pBag->Read(L"FriendlyName", &var, NULL );
if( hr != S_OK )
{
SysFreeString(var.bstrVal);
pBag.Release();
continue;
}

//is this ActiveGige filter?
if( !memcmp( W2CA(var.bstrVal), "GigE Vision compliant camera", 26 ) )
{
hr = pM->BindToObject( 0, 0, IID_IBaseFilter, (void**)pFilter );
}
noCapDevice++;
pM.Release();
pBag.Release();
SysFreeString( var.bstrVal );
}
pEm.Release();