Getting the chart file name?

[carlsevans]

I am working on a way to save the input parameters as defaults on a chart basis. Does anyone know of a way to obtain the fully qualified path name of the chart file so that the parameters can be saved for that chart?

Thanks in advance for any assistance you might be able to provide.

Carl Evans

[eSignal_JasonK]

Hello Carl,

We don't have a method for referencing the path of a chart file. Another idea you could try is to create text files and name them with a combination of Symbol and Interval. Then add a routine in your formula that builds a string equivalent of the text file containing your parameters for that chart using getSymbol() and getInterval(). The text files would have to be placed in the eSignal/FormulaOutput/ folder.

var aParameters = new Array(3);
var bLoaded = false;
var vPar1 = null;
var vPar2 = null;
var vPar3 = null;

function main() {
    if (bLoaded == false) {
        loadParameters();
        if (aParameters != null) {
            if (vPar1 == null) vPar1 = aParameters[0];
            if (vPar2 == null) vPar2 = aParameters[1];
            if (vPar3 == null) vPar3 = aParameters[2];
            bLoaded = true;
        }
    }

}

function loadParameters() {
    var f = getSymbol() + "-" + getInterval();
    f.open("rt");
    if (f.open()) {
        var i = 0;
        for (i = 0; i < 3; ++i) {
            aParameters[i] = f.readln();
        }
    }
    f = null;
    return;
} 

Your text file would need to have 3 parameters, each on a separate line for this example.

[Guest]

What Jason provided is a very nice method of identifying unique files for different efs's.

FWIW, be aware that the values that are stored need to be delimited somehow (I use commas), and when you read the line, the whole line is read as a single string. You must split(sSeparator, nLimit) the line which will then become an array. You then have to parseFloat( sValue ) the individual values to convert them from strings to numerical values.

[eSignal_JasonK]

Hello Steve,

I forgot the data conversion part. Thanks for catching that. As for the delimiters, the text file for this code example needs the data for the three parameters each on a separate line. It makes it a little easier than having to parse through comma-separated string. You should be good to go as long as the file looks something like,

10
false
20

Once the aParameters array is populated you can convert each element to it's proper data type within the routine in main also.

if (vPar1 == null) vPar1 = aParameters[0]*1; // number
if (vPar2 == null) vPar2 = eval(aParameters[1]); // boolean constant
if (vPar3 == null) vPar3 = aParameters[2]*1; // number

or:

if (vPar1 == null) vPar1 = eval(aParameters[0]);
if (vPar2 == null) vPar2 = eval(aParameters[1]);
if (vPar3 == null) vPar3 = eval(aParameters[2]);

[carlsevans]

Not quite the solution I was looking for

Jason and Steve,

Thanks for your quick replies but your suggestions aren't quite what I am looking for. What I am attempting is to develop a solution for saving the defaults of a study just as it works for the Basic Study indicators. The defaults for the indicator are saved as part of the chart, independent of the Symbol-Interval combination that appears on the chart. If I could obtain the chart file name then I could store the defaults for that indicator on that chart in a file. The optimal solution would be for eSignal to provide a way for the parameters of any study to be saved using the set defaults and restore defaults buttons, however, my understanding is that this functionality is not available because the buttons are disabled in the Edit Studies dialog when I select my study from the drop down list.

[Guest]

I have coded this functionallity in before, it works, but it is not very clean, and does not meet your "specification" in that the only way it could be saved as a unique file would be to figure in the chart interval, study name and/or the Symbol.

Let me know if you are still interested and I will describe how I save and load them. Maybe you can help make it a little cleaner.