public HResult GetService(Guid guidService,
Guid riid, out IntPtr ppvObject)
{
// If ppvObject were just an object, this routine would not return
// the riid the caller requested. That's why there's a custom
// implementation of this.
if (guidService == MFServices.MF_METADATA_PROVIDER_SERVICE)
{
// performs an AddRef
IntPtr ip = Marshal.GetIUnknownForObject(m_MetaData);
// performs an AddRef
HResult hr = (HResult)Marshal.QueryInterface(ip,
ref riid, out ppvObject);
Debug.WriteLineIf(hr != HResult.S_OK,
string.Format(
"IMFGetService::QueryInterface not supported: {0}: {1}",
MFDump.LookupName(typeof(MFServices), guidService),
MFDump.LookupInterface(riid)));
// Must release one of those AddRefs
Marshal.Release(ip);
return(hr);
}
Debug.WriteLine("IMFGetService::GetService not supported: {0}: {1}",
MFDump.LookupName(typeof(MFServices), guidService),
MFDump.LookupInterface(riid));
ppvObject = IntPtr.Zero;
return(HResult.MF_E_UNSUPPORTED_SERVICE);
}
protected static void TraceAttributes(IMFAttributes ia)
{
string s = MFDump.DumpAttribs(ia);
Debug.Write(s);
}
