How to import the live external data to NT8

[arthur0712]

Hi all,

We want to NT8 can read a signal from our local algorithm,

i,e., we would like to generate the data and save it to a local path, and ask NT8 to read it in every X mins (based on the input data series)

After read the post on "https://forum.ninjatrader.com/forum/ninjatrader-8/add-on-development/1144206-generate-plot-from-external-data-ninjascript", we found the main problem here is the algo never touch the modular 'OnBarUpdate', and with this error:




Here is our procedure:

(1) Download ths sample file ('SampleStreamReader_NT8.zip'), and add it to indicator.
(2) Save our signal data to the path: NinjaTrader.Core.Globals.UserDataDir
(3) the data format is exactly same as the scripts needs..

Is there any step-by-step tutrial that uesful?

Thank you

[NinjaTrader_Jesse]

Hello arthur0712,

The error is because the file is in use, your external program needs to write the data at a different time than NinjaTrader is trying to access the file. In addition to that you need to make sure the external software is closing the file after writing so its not in use. You should additionally be able to use the output window to see the actual exception that is happening because the try/catch in that sample is printing the error info.

[arthur0712]

Thanks, I just check the output, it shows:



but it makes me very confusing because the data format should be fine (I attached as below)
--------------------------------------------------------------------------
20241227 093000;6050.94;6098.32;6050.94;6098.32;0
20241227 093100;6049.06;6100.21;6049.06;6100.21;0
20241227 093200;6048.66;6100.61;6048.66;6100.61;0
20241227 093300;6049.46;6099.81;6049.46;6099.81;0
.....
---------------------------------------------------------------------------




Moreover, I closed all external programs, but the issue of 'samplestremwriter' still exist..any help?