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I'm trying to read and write a binary file (fingerprint). The contents of binary files are below:

tL.|¢Tn>ªÏû•"q‚º†k‹ë²¶zño‰JÇ5»

I read this file with the following command:

var input, file, fr; 
input = document.getElementById('fileinput'); 
file = input.files[0]; 
fr = new FileReader(); 
fr.onload = receivedBinary; 
fr.readAsBinaryString(file);     

function receivedBinary() {
    showResult(fr, "Binary");
}

function showResult(fr, label) {
    var result;
    result = fr.result;
    alert(result);    
 }

But it's happening a problem. When I see the file content that has been read, some characters are not loaded. The following file after read:

tL.|¢Tn>ªÏû"qºk벶zñoJÇ5»

For example, do you realize that the symbol "•", between characters û and " was not read.

Why? What should I do to read and write all the characters?

Improve this question
5
  • These differences are often due to character encoding. If it's a binary file, why are you trying to read it as a String? Commented May 31, 2015 at 12:59
  • 1
    possible duplicate of Difference between readAsBinaryString and readAsText using FileReader Commented May 31, 2015 at 13:00
  • Then, what command must I use instead readAsBinaryString? Commented May 31, 2015 at 13:03
  • Uhm, alerting binary is probably not a very good form of debugging Commented May 31, 2015 at 13:03
  • Try to use Uint8Array Commented May 31, 2015 at 13:58
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