Exchange data between strategies

[mcosta72]

Hello my friends,

I was looking for a way to get data from a strategy to be used in other one. For example I am running robot1 in simulated account and the trades results are stored in a dataseries var (DeltaSeries). Also I am running a robot2 in a real money account that needs data from that robot1 dataseries.
I tried to access via public class but it looks like it is inside - protected override void OnPositionUpdate - and not able to reach.
This is one of the error messages:
'NinjaTrader.Strategy.RoBot1.DeltaSeries' is inaccessible due to its protection level

Any help appreciated.

Thanks

[NinjaTrader_AlanP]

Hello mcosta72,

Thank you for your note.

You could use streamreader/writer to write to a text file and have the strategy reference this file. Please see the sample,

https://ninjatrader.com/support/forum/showthread.php?t=3477

An unsupported approach would be to use a static class. I’ve attached an example that shows how to use a static class in the NinjaTrader namespace that would allow you to pass objects between your scripts.

Please let us know if you need further assistance.

[mcosta72]

HI Alan,
Thank you for your help. I am thinking about time to access/reading and stream file. Do you think it would take an extra second to process it? Also, do you know if "File.ReadAllLines" allows me simultaneous access?
I've used txt files for other strategy but it isn't accessed by trigger. Hard to time the response.

Be well

[NinjaTrader_Jim]

Hello mcosta72,

I'm replying on behalf of Alan who is out of the office today.

File.ReadAllLines will simply read all of the contents of the file at that time and put it in a string array. It would not allow simultaneous access of the file. This would be restricted by the operating system. You may place logic in try catches to have a NinjaScript re-attempt reading the file if it hits a file access violation. Another idea would be to use a timer to time your reads and writes. An example NinjaScript using a timer can be seen in SampleLevel2Book.

In theory, there would be a delay in writing to a file, but this delay would likely be less than a second and would vary between the read/write speeds of your HDD or SSD and the contents you are writing to the file. We would be talking about a very small delay. If this delay is important for you to address, you could try the unsupported approach presented by Alan.

SampleLevel2Book - https://ninjatrader.com/support/foru...ead.php?t=3478

If there is anything else we can do to assist, please let us know.