First time using streamwriter here so forgive me if this is elementary. I'm basically just writing a strategy that can output data to a file. I know we have the export data strategy in the file sharing section, but indicators without parameters don't work (i.e. VWAP, OBV,etc) so I was just trying to hardcode it. For example, in the code attached I'm merely trying to output the avaPivots to a file when the strategy is run. When I do, I keep getting the error:

**NT** Error on calling 'OnBarUpdate' method for strategy 'Export/30587ddcccd4e3a0f238d380a903a': Object reference not set to an instance of an object.

It's gotta be something from the sw.WriteLine() that I'm not doing properly. Thanks in advance for your help!

So far, I haven't had a need to use streamwriter etc. So I can only offer so much assistance without doing some research.

But, I don't see where you've newed up a streamwriter object. AFAIK, you have to create a streamwriter object in order to use it. I believe you'll need to use the keyword 'new' somewhere.

Thanks Userque. Here is the attached sample code I was working from the NT7 support examples. The only sight of "new" is in the "namespace NinjaTrader.Indicator"

namespace NinjaTrader.Indicator
{
public partial class Indicator : IndicatorBase
{
private SampleStreamWriter[] cacheSampleStreamWriter = null;

private static SampleStreamWriter checkSampleStreamWriter = new SampleStreamWriter();

/// <summary>
/// A quick sample demonstrating StreamWriter properties.
/// </summary>
/// <returns></returns>
public SampleStreamWriter SampleStreamWriter()
{
return SampleStreamWriter(Input);
}

/// <summary>
/// A quick sample demonstrating StreamWriter properties.
/// </summary>
/// <returns></returns>
public SampleStreamWriter SampleStreamWriter(Data.IDataSeries input)
{
if (cacheSampleStreamWriter != null)
for (int idx = 0; idx < cacheSampleStreamWriter.Length; idx++)
if (cacheSampleStreamWriter[idx].EqualsInput(input))
return cacheSampleStreamWriter[idx];

lock (checkSampleStreamWriter)
{
if (cacheSampleStreamWriter != null)
for (int idx = 0; idx < cacheSampleStreamWriter.Length; idx++)
if (cacheSampleStreamWriter[idx].EqualsInput(input))
return cacheSampleStreamWriter[idx];

SampleStreamWriter indicator = new SampleStreamWriter();
indicator.BarsRequired = BarsRequired;
indicator.CalculateOnBarClose = CalculateOnBarClose;
#if NT7
indicator.ForceMaximumBarsLookBack256 = ForceMaximumBarsLookBack256;
indicator.MaximumBarsLookBack = MaximumBarsLookBack;
#endif
indicator.Input = input;
Indicators.Add(indicator);
indicator.SetUp();

SampleStreamWriter[] tmp = new SampleStreamWriter[cacheSampleStreamWriter == null ? 1 : cacheSampleStreamWriter.Length + 1];
if (cacheSampleStreamWriter != null)
cacheSampleStreamWriter.CopyTo(tmp, 0);
tmp[tmp.Length - 1] = indicator;
cacheSampleStreamWriter = tmp;
return indicator;
}
}
}
}

Syntax is not my strong point... do I need to include something like this in my code even though its a strategy? I always ignored this code because of the comments "Do not change or remove"