Error on Ninjascript

[nemesis45]

Hi,
I have created a strategy using ninjascript.

I need to use queue in c#, to deal with a collection of objects.

Using System.Collections.Generic.Queue ;

I am getting no error compiling the code,
but when applying strategy to instrument, i am getting a message ,

"Failed to execute DB job 'StrategyUpdateJob' There was an error reflecting type NinjaTrader.Strategy.abc': You must implement a default accessor on 'System.Collections.Generic.Queue' some so sand so ,, because it inherits from ICollection."

Also, i am getting some crap output when i try to access the queue and print the elements in it.
Could you please tell how to resolve this, and why i am gettnig this error.
No error @ compiler

[NinjaTrader_CalH]

Nemesis45,

Thank you for your post.

What does the full error message say?

[nemesis45]

Failed to execute DB job 'StrategyUpdateJob': There was an error reflecting type 'Ninjatrader.Strategy.GetBuySellPrintwithclasses'. You must implement a default accessor on System.Collections.Generic.Queue `1[[NinjaTrader.Strategy.Prints,ae3784a509af429fb375c8 f8dc5f6297, Version= 7.0.1000.22, Culture=neutral,PublickeyToken=null]] because it inherits from ICollection.

This is the full message

[NinjaTrader_CalH]

Nemesis45,

Thank you for that information.

What are you trying to accomplish with creating an ICollection?

Can you post a sample of how you are implementing this in your script?

[nemesis45]

hi

I am processing data, obtained from OnMarketUpdate(), putting it into a queue.

then, i need to perform a few operations on the data, which i am doing in OnBarUpdate()
I have added a time series object using Add(PeriodType.Second,1)
so that i can process my queue every second.

In OnBarUpdate(), i need to use an enumerator to process the queue.

[NinjaTrader_CalH]

Nemesis45,

Please note that this type of programming is not supported by NinjaTrader. However, are you using an ICollection object for your querying? You may want to use this kind of object for what you are trying to do.

There are some debugging tools available such as Print() and DrawObjects()

Debugging your script - http://www.ninjatrader.com/support/f...ead.php?t=3418

Additionally, you may want to use a Timer event instead of the Add() for 1 second as if there is no ticks of data coming in, your script won't run the OnBarUpdate event.

[nemesis45]

Nemesis45,

Please note that this type of programming is not supported by NinjaTrader. However, are you using an ICollection object for your querying? You may want to use this kind of object for what you are trying to do.

There are some debugging tools available such as Print() and DrawObjects()

Debugging your script - http://www.ninjatrader.com/support/f...ead.php?t=3418

Additionally, you may want to use a Timer event instead of the Add() for 1 second as if there is no ticks of data coming in, your script won't run the OnBarUpdate event.

Could you please specify, what kind of programming is that?
I cant put objects into a queue? or is there a problem with accessing the queue.

I have used Print() often for debugging, but this is something beyond the scope of debugging.

I am using the class Queue , as in
private Queue<Object type> queue1 = new Queue<objecttype>() ;

and then putting the objects in the queue

Isnt this fairly basic?
Thank you for the suggestion to use a timer. I had overlooked that fact.

using System.Collections.Generic;
I have added this to my using declarations.

Can i use file I/O with ninjatrader? i will need to write this data onto something.. database or a file or a queue.

[NinjaTrader_CalH]

Nemsis45,

We don't have any documentation on using the Queue inside of NinjaScript.

What object type are you using inside your script for the data from OnMarketData()?

Can you post a sample script of how you are doing this?

Yes, you can use System.IO to write to a text file.

[nemesis45]

public class Prints: Strategy

These are the variables in the class Prints

private double printstart ;
private double printend ;
private long printvol;
private TimeSpan printtime ; // no of hh/mm/ss in print
private DateTime timestamp ;

The queue is a queue of a few prints.
I could manually implement a stack/queue, if using system.collections is a problem.
Just wanted to know if there will be a problem allocating/ deallocating memory?
Could you please share the limitations of ninjatrader programming.
can i add onto the using namespace?

I could share the code, but dont want it to be public.

[NinjaTrader_CalH]

Nemsis45,

Can you send me the script that you are working with to support[at]ninjatrader[dot]com
Put ATTN Cal in the subject and a reference to this thread in the body.

[nemesis45]

Thanks a lot, just saved my code!
Excellent support for NinjaTrader

[nemesis45]

hi

Nemesis45,

Additionally, you may want to use a Timer event instead of the Add() for 1 second as if there is no ticks of data coming in, your script won't run the OnBarUpdate event.

Just noticed that if CalculateOnBarClose = false, I cant use OnBarUpdate(), as a timer, since it is being called for each incoming tick.

Could you please tell me how to use a timer event?
I dont see a timer() in alphabetical reference.

I can always implement one using TimeSpan object, is there another way to do it inside of ninjascript?

Thanks

[NinjaTrader_Bertrand]

Yes, you could use a Timer to trigger a custom event, please check into this reference on the topic - http://www.ninjatrader.com/support/f...ead.php?t=5965

[nemesis45]

Thanks, the timer i need will be executed every second.
Would it save processing if i simply use a TimeSpan object? or a custom trigger

[NinjaTrader_Bertrand]

Generally there would be an overheard compared to just quering DateTime.Now, however for one timer I wouldn't really be concerned.