public HRESULT GetUnknown(Guid guidKey, Guid riid, out object ppv)
{
var hr = _type.GetUnknown(guidKey, riid, out ppv);
Trace("guid: " + guidKey.ToName() + " riid: " + riid.ToName() + " value: " + ppv + " hr: " + hr);
return(hr);
}
public static IComObject <T> GetUnknown <T>(this IMFMediaType input, Guid key, Guid interfaceId)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (input.GetUnknown(key, interfaceId, out var value).IsError)
{
return(null);
}
return(new ComObject <T>((T)value));
}
public static object GetUnknown(this IMFMediaType obj, Guid key, Guid interfaceId)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
if (obj.GetUnknown(key, interfaceId, out var value).IsError)
{
return(null);
}
return(value);
}