How to load a text file data into an array?

Question

I have a code (this is a part only) :

var iStr:String;
var kStr:String;

var pixelValue:uint;

var Xcord:Vector.<int> = new Vector.<int>();
var Ycord:Vector.<int> = new Vector.<int>();
var PixVal:Vector.<uint> = new Vector.<uint>();

 for (i= 0; i< 225; i++)
 {
  iStr = fs.readUTF()  + "\n";  
  Xcord[i] = int(iStr); 
  kStr = fs.readUTF()  + "\n";
  Ycord[i] = int(kStr);
  pixelValue = fs.readUnsignedInt() ;
  PixVal[i] = pixelValue;  
  trace(Xcord[i]);
  trace(Ycord[i]);
  trace(PixVal[i].toString(16));
  i++;
  trace(i);
}

I have three arrays, first and second ones for storing integers values, third one for storing unit values. I want after reading every line in my text file data , I assign it to an element in an array, but the problem, it reads only first 3 data (values) in the file, then give me this error message:

Error: Error #2030: End of file was encountered.

at flash.filesystem::FileStream/readUTF() at bitmapPixelDisplay_Air_Scene1_fla::MainTimeline/frame1()[bitmapPixelDisplay_Air_Scene1_fla.MainTimeline::frame1:63] at runtime::ContentPlayer/loadInitialContent() at runtime::ContentPlayer/playRawContent() at runtime::ContentPlayer/playContent() at runtime::AppRunner/run() at ADLAppEntry/run() at global/runtime::ADLEntry()

Can anybody help me to solve my problem? what is a proper way to load a text file data into an array? how to fix my code? Any way to check for reaching end of file? or Should I use byteArray, then I use readByte method and How? or what?.

with thankful.

I have gotten an idea for my issue, I like to give me your opinion, I have used ay array as follow:

var PixInfo: Array = new Array(21, 35,0x393939, 22, 33,0x4c4c4c, 22, 34,0x2e2b2b, 22, 35,0x141414, 22, 36,0x161313, .......... );

I have filled the array with all values from text file (by copy and paste method) then, I have updated my code as follow:

PixInfo.reverse(); // to read array in reverse way.

Canav.addEventListener(Event.ENTER_FRAME, TextDisplay);

function TextDisplay(evt: Event):void
{

    CanavData.setPixel(PixInfo[i+2], PixInfo[i+1], PixInfo[i]);

    trace (PixInfo[i+2], PixInfo[i+1], PixInfo[i].toString(16));

    i+=3;

    if ( i > 674)
  {
     Canav.removeEventListener(Event.ENTER_FRAME,TextDisplay);
  }

it has worked very well as I need, I think its short way for solving my issue, but any suggestion or advice for me about if this way has any disadvantages or problems?

Answer 1

Edit Answer : After re-reading I see you really mean...

A part of my text file is :

21 35 393939 
22 33 4c4c4c 
73 31 191717 
73 32 100e0e 
73 33 151414 
73 34 121212 
73 35 c0c0c //<---needs fixing as c0c0c0??
73 36 272727 

You can use the spaces (byte 0x20) as a delimiter, to know the end/start of the required values.

First set up your vars like below:

public var iStr:String;
public var kStr:String;

public var pixelValue:uint;

public var Xcord:Vector.<int> = new Vector.<int>();
public var Ycord:Vector.<int> = new Vector.<int>();
public var PixVal:Vector.<uint> = new Vector.<uint>();

//add these
public var temp_BA :ByteArray = new ByteArray; //holds some byte values of file
public var byteVal :int = 0;
public var pos_Start :int = 0;
public var pos_End :int = 0;

Then later you can use a while loop to update :

fs.position = 0; //important!!
var idx:uint = 0; //your index/pos within your Vector arrays

while (true)
{
    if ( ( (pos_Start+1) > fs.length ) || (fs.position >= fs.length) )
    { trace("### Reached end of file... breaking"); break; }
    else
    {
        //# get X-coords
        find_Space_delimiter(pos_Start);
        temp_BA.position = 0;
        Xcord[idx] = int( String(temp_BA) );
        trace("Xcord["+idx+"] : " + Xcord[idx]);

        //# get Y-coords
        pos_Start += 1; //update pos
        find_Space_delimiter(pos_Start);
        temp_BA.position = 0;
        Ycord[idx] = int( String(temp_BA) );
        trace("Ycord["+idx+"] : " + Ycord[idx]);

        //# get PIXel-VALue
        pos_Start += 1; //update pos
        find_Space_delimiter(pos_Start);
        temp_BA.position = 0;
        PixVal[idx] = int( "0x" + String(temp_BA) );
        trace("PixVal["+idx+"] : " + PixVal[idx].toString(16) );

        pos_Start += 1; idx++; //update positions
    }
}

You'll need this helper function to scan for any bytes until stopping at a space (0x20) byte...

public function find_Space_delimiter(inPos:int) : void 
{
    temp_BA.clear(); //reset
    fs.position = pos_Start = inPos;

    while(true)
    {
        if (fs.position < fs.length)
        { byteVal = fs.readUnsignedByte(); }  //position is now +1 (auto after any READ)
        else{ break; }

        //# is space
        if (byteVal == 0x20) 
        { 
            //trace("got entry at : " + fs.position + " ... breaking"); 
            temp_BA.position=0; break; 
        }
        else 
        {
            //trace("byteVal : " + byteVal.toString(16).toUpperCase() );

            temp_BA.writeByte(byteVal);
            pos_Start++;
        }
    }

}

Original answer

A part of my text file is : 21 35 39 39 39 22 33 4c 4c ....

So you've got hex values in your text, and you want to convert them into a ByteArray?

Try this:

var my_text :String = "your text file contents";
var my_bytes_Array :ByteArray = new ByteArray;

//# update the Array with values converted from text
my_bytes_Array = string_toBytes (my_text);

//# the converter function (returns/updates data type of... ByteArray)
public function string_toBytes( hex:String ) :ByteArray
{
    // CONVERT STRING OF HEX CODES INTO A BYTEARRAY //
    /////////////////////////////////////////////////

    hex = hex.split(" ").join(""); //remove white spaces in bytes string

    var ba:ByteArray = new ByteArray();     ba.position = ba.length;
    var len:uint = hex.length;              //trace("writeBytes. len: " + len);

    for (var i:uint = 0; i < len; i += 2)
    {
        var byte:uint = uint("0x" + hex.substr(i, 2));
        ba.writeByte(byte);
    }

    return ba;
}

Answer 2

I might be missing something but in case the fs is a filestream it should be much easier?

var myString:String = fs.readUTF();

var lines:Array = myString.split("\n"); // split text file by newlines. Your textfile do have the values on each line right?

for(var i:int; i < lines.length; i++)
{
    var lineArray:Array = lines[i].split(" "); // split each line by spaces. if you have tabs split by "\t"

    var x:int = trim(lineArray[0]) as int;
    var y:int = trim(lineArray[1]) as int;
    var pixVal:int = trim("0x" + lineArray[2]) as int; // prepend with 0x so it will cast to an integer. Untested though
}

private function trim(value:String):String
{
    // remove all spaces
    return value.reaplce(/ /gi, value);
}