Detect non-existance of secondary Instrument

[BigWaveDave]

Anyway to tell after using Add() to add a secondary instrument, whether or not it was actually Added?

I can see in the log tab when the instrument is not available from my provider but I need a way to determine this fact programatically...

Thx,
Dave

[NinjaTrader_Joydeep]

Hello BigWaveDave,
Thanks for your note.

Unfortunatley there are no native way to do it however you can simply check for the minimum bars for the bar series to do it

if (CurrentBars[0] < BarsRequired || CurrentBars[1] < BarsRequired) return;

http://www.ninjatrader.com/support/helpGuides/nt7/index.html?currentbars.htm

[koganam]

Anyway to tell after using Add() to add a secondary instrument, whether or not it was actually Added?

I can see in the log tab when the instrument is not available from my provider but I need a way to determine this fact programatically...

Thx,
Dave

Use try ... catch block, and catch the exception if any.

ref: http://msdn.microsoft.com/en-us/libr...(v=vs.90).aspx

[BigWaveDave]

Good idea. I'm lazy though. Do you know for a fact that NT throws an exception in this case?

[koganam]

Good idea. I'm lazy though. Do you know for a fact that NT throws an exception in this case?

I am reasonably certain that NT throws an exception. After all, NT does refuse to produce output. If I remember right, it even logs a message to the effect that: "index was out of bounds of the array" or some such.

ref: https://www.google.com/search?hl=en&...rp.XjiMkiSALMQ

http://www.ninjatrader.com/support/forum/search.php?searchid=1414788

[BigWaveDave]

I guess if one were not to check CurrentBars before attempting to access the array, you'd certainly get an exception thrown. That test is effectively equivalent to the original suggestion and would work...

Just wondering if "Add()" throws an exception in this case. I'll try it out.