TypeError: Bad argument using Node.js fs.read()

Question

I'm trying to get fs.read() to work but running into some issue(s). Here is my fread.js script:

var fs = require('fs');

fs.open('test.txt', 'r', function (err, handle) {

    var f = handle;
    var b = new Buffer(100000);

    fs.read(f, b, 0, 100000, null, function (err, bytesRead) {
        console.log(b.toSting("utf8", 0, bytesRead));
        fs.close(f);
    });

});

Why do I get the following TypeError: Bad Argument error upon running it?

$ node fread.js 

fs.js:457
  binding.read(fd, buffer, offset, length, position, wrapper);
          ^
TypeError: Bad argument
    at Object.fs.read (fs.js:457:11)
    at /home/max/dev/livelessons/fread.js:8:5
    at Object.oncomplete (fs.js:107:15)

@Scimonster: Oh, overlooked the function argument, I thought handle wasn't set anywhere. — Cerbrus
– Cerbrus, Commented Apr 28, 2014 at 12:16
Duplicating f and handle variables is unnecessarily btw. — Scimonster
– Scimonster, Commented Apr 28, 2014 at 12:16
Argg. So sorry for wasting all of your time. I was opening a non-existent file. test.txt should have been text.txt. Sure it was a bad argument but that error message gave me little clue as to where to find it. — user883807
– user883807, Commented Apr 28, 2014 at 12:35

user883807 · Accepted Answer · 2014-04-28 23:18:16Z

4

The problem was that I gave it the wrong file name. test.txt should have been text.txt. Doh!

answered Apr 28, 2014 at 23:18

user883807

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Comments

mscdex · Accepted Answer · 2014-04-28 12:33:07Z

2

You should check that fs.open() was successful first. Most likely err is set and handle is set to undefined, causing the "Bad Argument" error.

answered Apr 28, 2014 at 12:33

mscdex

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