BeginDataLoad Exception

Yaropolk · Postby **Yaropolk** » 23 Aug 2013

Hello,

Not sure if this is a bug or I'm just doing something wrong.

When applied to chart the indicator generates message: SEHException (0x80004005): External component has thrown an exception.

Please see the attached image to see the full exception message.

I use MC.NET Starter Edition x64. The symbol I'm trying to download the data for is one of two symbols I have in the Quote Manager.

The code which generates the exception is as follows:

Code: Select all


using System.Collections.Generic;



namespace PowerLanguage.Indicator{

	public class Test6_DataLoader : IndicatorObject {

		public Test6_DataLoader(object _ctx):base(_ctx){}



        	private List<Bar> m_StockP = new List<Bar>();



        	protected override void Create() {}



		protected override void StartCalc()

		{

            		var dataReq = new DataRequest {RequestType = DataRequestType.BarsBack, Count = Bars.FullSymbolData.Count};



			var req = Bars.Request;

            		req.Range = dataReq;



            		req.Symbol = "P";

            		DataLoader.BeginLoadData(req, OnData, null); //EXCEPTION ON THIS LINE

		}



		protected override void CalcBar() {}



        	private void OnData(IDataLoaderResult Result) {}

	}

}

Henry MultiСharts · Postby **Henry MultiСharts** » 27 Aug 2013

Hello Yaropolk,

Please use the following code:

Code: Select all

protected override void StartCalc()

      {

         var req = Bars.Request;

         req.Range = DataRequest.CreateBarsBack(System.DateTime.Now, Bars.FullSymbolData.Count);





                 DataLoader.BeginLoadData(req, OnData, null);

      }

Yaropolk · Postby **Yaropolk** » 29 Aug 2013

Thank you, I will try it.

Yaropolk · Postby **Yaropolk** » 30 Aug 2013

Henry,

Your code works.

The code I tried initially was taken from this wiki-page - http://goo.gl/pv6tRe

If that code is not working than it should probably be changed there.

I understand that wiki example uses constructor for creating DataRequest instance. And yours uses factory method. As I understood crash happens because To field of the DataRequest is not initialized in wiki example. If I use either of the following two initializations no crash happens.

Code: Select all

var dataReq = new DataRequest(DateTime.Now, Bars.FullSymbolData.Count, DataRequestType.BarsBack, DateTime.MinValue);



or



var dataReq = new DataRequest { To = DateTime.Now, Count = Bars.FullSymbolData.Count, RequestType = DataRequestType.BarsBack}; //, From = DateTime.MinValue };

The problem with DataRequest type is that it is a struct and can't have explicit private parameterless constructor (to prohibit users to use C#'s object initializer feature).

The easiest solution is to make DataRequest type a class and add private parameterless constructor.

Yaropolk · Postby **Yaropolk** » 30 Aug 2013

Now I've discovered another problem with the code. The code works with stock symbols. But when I'm trying to download data for $TRIN symbol it throws SymbolNotFoundException.

My datafeed is eSignal. Since I use Starter Edition I DO make sure that $TRIN is one of two symbols present in QuoteManager before trying the code. And $TRIN symbol can be loaded on price chart.

Thanks,
Yaropolk

Henry MultiСharts · Postby **Henry MultiСharts** » 10 Sep 2013

Now I've discovered another problem with the code. The code works with stock symbols. But when I'm trying to download data for $TRIN symbol it throws SymbolNotFoundException.

My datafeed is eSignal. Since I use Starter Edition I DO make sure that $TRIN is one of two symbols present in QuoteManager before trying the code. And $TRIN symbol can be loaded on price chart.

Thanks,
Yaropolk

Please make sure that you have specified the correct symbol parameters for $TRIN in DataLoader:

Code: Select all

protected override void StartCalc()

    {

      var req = Bars.Request;

      req.Range = DataRequest.CreateBarsBack(System.DateTime.Now, Bars.FullSymbolData.Count);

      req.Symbol = "$TRIN";

      req.Category = ESymbolCategory.Index;

      req.Exchange = "USI";

      DataLoader.BeginLoadData(req, OnData, null);

    }

BeginDataLoad Exception

BeginDataLoad Exception

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Re: BeginDataLoad Exception