error handling on readFileSync in node.js

Question

I have this code

var fd = fs.openSync(filePath,"r");
var fr = fs.readSync(fd, buffer, 0, size, 0);

and it throws error like that

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: OK, open 'C:\Users\iahmed16\Desktop\eclipse WS\test\images\af31a9e0a98939be82f887b0005c21752e71425e.jpg'

how to handle this error ??
what's the meaning of the error if you know ??

Community · Accepted Answer · 2017-05-23 12:08:26Z

10

The error seems to mean that you have too many file descriptions open.

You have to make sure at some point that you close() them.

var fd = fs.openSync(filePath,"r");
var fr = fs.readSync(fd, buffer, 0, size, 0);
fs.closeSync(fd);

As for how to handle the error, you can use try...catch with thrown errors:

try {
    var fd = fs.openSync(filePath,"r");
    var fr = fs.readSync(fd, buffer, 0, size, 0);
    fs.closeSync(fd);
} catch (e) {
    console.log('Error:', e);
}

edited May 23, 2017 at 12:08

CommunityBot

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answered Aug 25, 2013 at 10:17

Jonathan Lonowski

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1 Comment

Islam Khaled Over a year ago

I'm using try...catch ... but some errors force the app to crash and not enter in the catch part. or that means I have error in another part of the code ???

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