Error reading binary file in Javascript

Asked May 31 '15 at 12:57

Active Oct 10 '15 at 18:25

Viewed 117 times

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"qºkë²¶zñoJÇ5»

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?

edited Oct 10 '15 at 18:25

halfer

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asked May 31 '15 at 12:57

Fernando

These differences are often due to character encoding. If it's a binary file, why are you trying to read it as a _String_? – Paul S. May 31 '15 at 12:59
1

possible duplicate of [Difference between readAsBinaryString and readAsText using FileReader](http://stackoverflow.com/questions/9346052/difference-between-readasbinarystring-and-readastext-using-filereader) – CodingIntrigue May 31 '15 at 13:00
Then, what command must I use instead readAsBinaryString? – Fernando May 31 '15 at 13:03
Uhm, alerting binary is probably not a very good form of debugging – adeneo May 31 '15 at 13:03
Try to use Uint8Array – Microshine May 31 '15 at 13:58

Error reading binary file in Javascript

0 Answers0