static void Callback(IntPtr ptr)
{
CFDictionary dic = new CFDictionary(ptr);
Console.WriteLine(dic.ToString());
//CFType v1 = dic.GetValue("Status");
//CFType v2 = dic.GetValue("PercentComplete");
//CFType v3 = dic.GetValue("Error");
//var status = v1.ToString();
//var percent = v2.ToString();
//var error = v3.ToString();
}