LibCurl.Curl.internal_ProgressCallback C# (CSharp) Method

        int internal_ProgressCallback(IntPtr ptrUserdata, double dlTotal, double dlNow, double ulTotal, double ulNow)
        {
            if (_OnProgressCallback != null)
            {
                object userdata = GetObject(ptrUserdata);
                return _OnProgressCallback(userdata, dlTotal, dlNow, ulTotal, ulNow);
            }
            return 0;
        }