StreamWriter with Live Strategy

[stefy]

mrlogik,

I tried with arrays but I don't have any programming experience with them, and the C# guide didn't offer me any clue.

I would be very grateful if you could hint how to use arrays for dealing with a PnL from an external strategy.

[mrlogik]

Stefy,

Remove the DataSeries variable first from GlobalStrategy.cs

Add the following to the partial class Strategy

public static double[] gDataVal = new double[10000];

Now, in the strategy you have setting ths PnL value, do something like this

if(CurrentBar >= 0 && CurrentBar < 10000)
    gDataVal[CurrentBar] = [I]whatever the PnL value is[/I]

and get the data from the other strategy this way

if(CurrentBar >= 0 && CurrentBar < 10000)
    double pNL = gDataVal[CurrentBar][I];
[/I]

Note the max CurrentBar value is the same across all 3 locations (10000 in this case). You don't want to go out of bounds with your array. If the chart has more than 10000 bars, increase it to however many bars you have. Also, this will only work on the same chart type with the same amount of data loaded. The CurrentBar is being used as an indexer, so it must be synchronized across both charts / strategies. Am I clear?

This is another quick and dirty way of doing things. Try this out first and see if it works for you. If it does what you need it to, you should make a class within the GlobalStrategy.cs file with get / set methods that do these checks for you.

let us know.

[stefy]

Thank you mrlogik.

"Also, this will only work on the same chart type with the same amount of data loaded. "

That's fine, I'm using this just between strategies, no charts involved.

I tried this out, but I have some trouble with the last declaration:

if(CurrentBar >= 0 && CurrentBar < 10000)
double pNL = gDataVal[CurrentBar];

I get three error messages from the compiler:
. expected
statement expected
Embedded statement cannot be a declaration

[mrlogik]

just a quick shot.

double pNL;

if(CurrentBar >= 0 && CurrentBar < 10000)
    pNL = gDataVal[CurrentBar];

[stefy]

Hi mrlogik,

Sorry for the late reply, I was swamped with work in the last few days.

Thank you very much for your snippet, now I can access the array from another strategy! I like your way of dealing with NT limitations in a quick and dirty way!

If it does what you need it to, you should make a class within the GlobalStrategy.cs file with get / set methods that do these checks for you.

Could you please explain what do you mean by that?

[mrlogik]

What i mean is, if its works for you (which it did) you shouldn't do a quick and dirty coding of this, as it may cause memory overwrites if you're not careful, or crashes.

You should write Get / Set Methods which encapsulate the elements of the global variables. Does that clear it up?

[stefy]

Not really. I understand what you mean, but I don't have a clue on how to implement it into the code.
My knowledge of get-set methods is limited to the classic NT:

 #region Properties
        [Description("")]
        [Category("Parameters")]
        public int P
        {
            get { return p; }
            set { p = Math.Max(1, value); }
        }
        #endregion

Maybe the concept is similar? Could you give me an example?

[astrolobe]

mrlogik,
I tried your code but received the following error: System.UnauthorizedAccessException: Access to the path 'C:\test.txt' is denied.
Do you have an idea why this is happening?

thanks.

[zweistein]

You are not autorized to access the file C:\Test.txt

In Vista (maybe also XP) do do not have write access to th root directory C:\

Choose another directory.

[mrlogik]

Stefy,

What I mean is, in your Global file, you should write a class, something like the following...

public class GlobalData
{
public static double[] gDataVal;

//Default constructor
public GlobalData()
{
    this.gDataVal = new double[10000];
}

// Access method
public double GetgDataVal(int idx)
{
    doulble rVal = 0;
    if(idx >= 0 && idx < 10000)
        rVal = this.gDataVal[idx];
    return rVal;
}

// Set Method
public void SetgDataVal(int idx, double iVal)
{
    if(idx >= 0 && idx < 10000)
        this.gDataVal[idx] = iVal;
}
}

Then, in the section of the partial area of the global file, add this.

public static GlobalData gData = new GlobalData();

Now, when you set the GlobalData in strategy 1, it should be done as such

gData.Set(CurrentBar, pnl);

And read in strategy 2 as such.

double val = gData.Get(CurrentBar);

This is no longer a "quick and dirty way," as we now encapsulate our array with a class, get, and set methods which do all of our array indexing error conditions within.

Does this make sense?

mrLogik

[mrlogik]

mrlogik,
I tried your code but received the following error: System.UnauthorizedAccessException: Access to the path 'C:\test.txt' is denied.
Do you have an idea why this is happening?

thanks.

Are you the admin on the computer you are working with?

Also, the Initialize section should read something like this...

 
LogFile = new DataLogType(".csv", "NTLOGS\\", "aGridEntryV1_LOG")

Where
.csv = file extension
NTLOGS = the folder to write to (C:\NTLOGS)
aGridEntryV1_LOG = the log file name.

The NTLOGS director MUST exist in order to write a file to it.

hope this helps

[mtthwbrnd]

Thanks.

MrLogik: Thanks for posting the GlobalStrategy.cs code. :-)