I have a program which reads an array of bytes. Those bytes are supposed to be ISO-8859-2 decimal codes of characters. My test array has two elements: 103 which is letter g and 179 which is letter ł (l with tail). I then create a Blob object from it and check its content using two methods:
- FileReader
- objectURL
The first method gives correct results but the second method gives an extra character in the saved blob file.
Here is the code:
var bytes = [103, 179];
var chr1 = String.fromCharCode(bytes[0]);
var chr2 = String.fromCharCode(bytes[1]);
var str = '';
str += chr1;
str += chr2;
console.log(str.charCodeAt(0)); //103
console.log(str.charCodeAt(1)); //179
console.log(str.charCodeAt(2)); //NaN
var blob = new Blob([str]);
console.log(blob.size); //3
//Checking Blob contents using first method - FileReader
var reader = new FileReader();
reader.addEventListener("loadend", function() {
var str1 = this.result;
console.log(str1); //g³
console.log(str1.charCodeAt(0)); //103
console.log(str1.charCodeAt(1)); //179
console.log(str1.charCodeAt(2)); //NaN
});
reader.readAsText(blob);
//Checking Blob contents using second method - objectURL
var url = URL.createObjectURL(blob);
$('<a>',{
text: 'Download the blob',
title: 'Download',
href: url
}).appendTo('#my');
In order to use the second method I created a fiddle. In the fiddle, when you click the "Download" link and save and then open the file in a binary editor, it consists of the following bytes: 103, 194, 179.
My question is, where does the 194 come from and how to create a blob file (using the createobjectURL method) containing only bytes given in the original array ([103, 179] in this case).
