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<blockquote data-quote="noumaan" data-source="post: 9425" data-attributes="member: 11321">Hi Folks,i'm trying to write Blackmagic Videohub application in c# but unfortunately BMD does not provide any sample project for C#.please someone help me to understand about VideoHub interface and addref in C#My Code is:[XCODE=c#]private Videohub.HubMonitor m_hubMonitor;public Form1(){&nbsp; &nbsp; InitializeComponent();}IVideohubDiscovery videoHubDiscovery;public static IVideohub m_hub;static IVideohubState m_state;private void button1_Click(object sender, EventArgs e){&nbsp; &nbsp; videoHubDiscovery = new CVideohubDiscovery();&nbsp; &nbsp; try&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; videoHubDiscovery.ConnectTo(TBserver.Text, 10000, out m_hub);&nbsp; &nbsp; }&nbsp; &nbsp; catch(COMException ex)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; if (ex.HResult == -2147467259)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; MessageBox.Show(&quot;Connection Timeout&quot;);&nbsp; &nbsp; &nbsp; &nbsp; return;&nbsp; &nbsp; }&nbsp; &nbsp; m_hub.GetState(out m_state);&nbsp; &nbsp; uint index = 0;&nbsp; &nbsp; _BMDVideohubHardwareState hardware = new _BMDVideohubHardwareState();&nbsp; &nbsp; System.Diagnostics.Debug.WriteLine(&quot;--- Video input ports\n&quot;);&nbsp; &nbsp; while (index &lt;= 40 - 1)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; m_state.GetLabel(_BMDVideohubPortType.BMDVideohubVideoInputPort, index, out string label);&nbsp; &nbsp; &nbsp; &nbsp; m_state.GetHardware(_BMDVideohubPortType.BMDVideohubVideoInputPort, index, out hardware);&nbsp; &nbsp; &nbsp; &nbsp; string bstrLabel = label;&nbsp; &nbsp; &nbsp; &nbsp; System.Diagnostics.Debug.WriteLine(&quot;&nbsp; \n &quot; + index + &quot; &quot; + hardware.ToString() + &quot; &quot; + bstrLabel);&nbsp; &nbsp; &nbsp; &nbsp; index++;&nbsp; &nbsp; }&nbsp; &nbsp; //m_hubMonitor = new Videohub.HubMonitor(m_hub);&nbsp; &nbsp; //m_hub.AddVideohubCallback(m_hubMonitor);}[/XCODE]i'm getting input ports like this but when i'm trying to get input ports by calling callback i get E_NOINTERFACE error or even i try to get input ports from another method i get same E_NOInterface errorcallback error line is:[XCODE=c#]public HubMonitor(IVideohub hub){&nbsp; &nbsp; m_hub = hub;}void IVideohubCallback.StateChanged(){&nbsp; &nbsp; if (m_state == null)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; m_hub.GetState(out m_state); //Getting Error Here NOINTERFACE&nbsp; &nbsp; &nbsp; &nbsp; DumpState(m_state);&nbsp; &nbsp; }&nbsp; &nbsp; else&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; m_hub.GetState(out m_state);&nbsp; &nbsp; &nbsp; &nbsp; DumpState(m_state);&nbsp; &nbsp; }}[/XCODE]waiting for helpthanks and regards,Noumaan</blockquote>

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