How do you manipulate strings?

[WantToLearn]

I am reading a file in my program. The file contains the date, Open, High, Low, and Close, all of them seperated by a comma. When I use f.readln() it reads the entire line of data. Once I get this data how can I break it into the areas I need (specifically the data under Close)? (Tried using f.read() and did not get any luck that way either.)

In Visual Basic they have right$(), left$(), mid$() so you can easily manipulate the string to get the numbers you need. But I can't find anything like that in EFS. Can anyone point me in the right direction please.

Jack

[Guest]

Re: How do you manipulate strings?

Hi Jack,

Here is a demo efs that opens a file, reads each line, converts each line to an array, then converts each string to a number, then returns a data array.

Hope this helps.
Steve

//~ save this in the FormulaOutput folder in this location 'want2\myFile.txt'
//~ 1,1,1,1,1,1
//~ 2,2,2,2,2,2
//~ 3,3,3,3,3,3
//~ 4,4,4,4,4,4

//~ Global Variables
var bInit,filename,fileData;
bInit=false;
filename="want2\\myFile.txt";
fileData=null;

function preMain() {
 setPriceStudy(true);
 setStudyTitle("fileData");
 setShowTitleParameters(false);
}

//~ Main processing function
function main() {
 if (!bInit) {
  fileData=loadFile(filename);//~ loading file data
  debugPrintln("23: fileData = "+fileData);
  bInit=true;
 }
}

function loadFile(tmp){
 var x,data,fileObj,a;
 data=null;
 x=0;
 fileObj = new File(tmp);
 if(fileObj.exists()){
  data=[];
  fileObj.open("at+");
  while(!fileObj.eof()) {
   a= fileObj.readln();
   if(a != null && a.indexOf(",")>0 ){//~  prevents from reading lines which are null or with no comma
    a=a.split(",");
    var n=a.length;
    while(n--){
     a[n]=+a[n];//~ [url]http://jibbering.com/faq/notes/type-conversion/[/url]
    }
    data[x++]=a;
   }
  }
 }
 fileObj.close();
 return data;
 return data;
}
//~ sample debugPrintln output
//~ 23: fileData = 1,1,1,1,1,1,2,2,2,2,2,2,3,3,3,3,3,3,4,4,4,4,4,4 

Originally posted by WantToLearn
I am reading a file in my program. The file contains the date, Open, High, Low, and Close, all of them seperated by a comma. When I use f.readln() it reads the entire line of data. Once I get this data how can I break it into the areas I need (specifically the data under Close)? (Tried using f.read() and did not get any luck that way either.)

In Visual Basic they have right$(), left$(), mid$() so you can easily manipulate the string to get the numbers you need. But I can't find anything like that in EFS. Can anyone point me in the right direction please.

Jack

[WantToLearn]

After playing with it trying to understand how it all works I got it to work the way it should. Your example was very helpful and I appreciate you taking the time to help out.

Thanks Steve,
Jack

[Guest]

Hi Jack,

Your most welcome, good to hear it helped you code a solution.

Steve

Originally posted by WantToLearn
After playing with it trying to understand how it all works I got it to work the way it should. Your example was very helpful and I appreciate you taking the time to help out.

Thanks Steve,
Jack