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 ??

Answer 1

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);
}