Plot inside c# async Callbacks or Task.Run

[antonma]

Hi,

I do calculation outside of NJ8 and would like to plot bars as soon as results are available. Therefor I use async functionality from .Net. Unfortunately I can’t plot anything from the callback and receive an error message saying that the index is out of range.

How can I plot something inside a callback like this:

QClient.OnMessageAsync(async message =>
{
   //read result...
   //Plot result
   Plot[0] = message.result; // this doesn't work
}

Any help is greatly appreciated.
Thx,
Anton

[NinjaTrader_ChelseaB]

Hello Anton,

I will not be able to assist with a 3rd party application.

However, if this code is being called from within a NinjaScript, in what method is this being called?

[antonma]

Hi,

I initialize this callback in the OnStateChange (State == State.Configure) method.
Thing that also doesn't work for me (same error saying that index is out of range) is when I try to plot a bar inside a Task.Run like this in the OnBarUpdate() method:

Task completeRequests = Task.Run( async () =>
{
   //Work with data
   //Plot data
   Plot[barsago] = 3;
}

[NinjaTrader_ChelseaB]

Hello antonma,

You will not be able to set plots before that historical bar is processed. In other words, you will not be able to set a plot when State == State.Configure.

Also, if you are running code in a Task, or OnRender, or in a custom timer, the data series and plots are not going to be synced. So TriggerCustomEvent must be called to sync those series.
http://ninjatrader.com/support/helpG...ustomevent.htm

Attached is an example of setting the last few bars in a Task. (Keep in mind that Tasks are not supported by NinjaTrader to do, however, I thought this would be a good example of when TriggerCustomEvent is necessary.

[antonma]

Hi Chelsea,

thank you very much. This is exactly what I need.

Cheers,
Anton