String to byte array

Question

I have to convert a string to byte (16 bit) in JavaScript. I can do this in .net in following code but I have to change this for old classic asp App which uses JavaScript.

string strShared_Key = "6fc2e550abc4ea333395346123456789";
int nLength = strShared_Key.Length;
byte[] keyMAC = new byte[nLength / 2];
for (int i = 0; i < nLength; i += 2)
    keyMAC[i / 2] = Convert.ToByte(strShared_Key.Substring(i, 2), 16);

This is the JavaScript function but doesn't return same out put as above .net code.

function String2Bin16bit(inputString) {
        var str = ""; // string 
        var arr = [];       // byte array 
        for (var i = 0; i < inputString.length; i += 2) {
            // get chunk of two characters and parse to number 
            arr.push(parseInt(inputString.substr(i, 2), 16));
        }
        return arr;
    }

possible duplicate of Javascript/HTML - converting byte array to string Question/Solution has both ways of doing it. — epascarello
– epascarello, Commented Sep 20, 2011 at 11:59

pimvdb · Accepted Answer · 2011-09-20 11:57:43Z

1

You want parseInt(x, 16) which will read x as a number and parse it as such bearing in mind that it's in base 16.

var str = "aabbcc"; // string
var arr = [];       // byte array
for(var i = 0; i < str.length; i += 2) {
    arr.push(parseInt(str.substr(i, 2), 16)); // get chunk of two characters and parse to number
}

answered Sep 20, 2011 at 11:57

pimvdb

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8 Comments

user228777 Over a year ago

I tried writing following function but did not output the exact value what I get in .net function. function String2Bin16bit(inputString) { //var str = "aabbcc"; // string var arr = []; // byte array for (var i = 0; i < inputString.length; i += 2) { // get chunk of two characters and parse to number arr[i / 2] = arr.push(parseInt(inputString.substr(i, 2), 16)); } return arr; }

pimvdb Over a year ago

Is that JavaScript? You're using arr[i / 2] = arr.push, which does not make sense. arr.push simply adds the value to the array, so no need for indices.

user228777 Over a year ago

Yes it is javascript, still results are not same like .net function. I changed to function String2Bin16bit(inputString) { var str = ""; // string var arr = []; // byte array for (var i = 0; i < inputString.length; i += 2) { // get chunk of two characters and parse to number arr.push(parseInt(inputString.substr(i, 2), 16)); // str = str + arr.push(parseInt(inputString.substr(i, 2), 16)); } return arr; }

pimvdb Over a year ago

@user228777: What about posting it in your question, since it's inscrutable without formatting in comments please.

pimvdb Over a year ago

@user228777: It works fine for me. What differences are there in the results?

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