Node js dynamic images- error

Question

This piece of code is used to create dynamic images based on the height and width parameters set ..Say localhost:3000/50/50 would give an image of width 50 and height 50..I am using this code I got from github..I have installed imageMagick in my system.

var http = require('http'); var url = require('url'); var fs = require('fs'); var gm = require('gm'); var server = http.createServer(function(request, response){ var url_parts = url.parse(request.url).path.substring(1).split("/"); var width = parseInt(url_parts[0]); var height = parseInt(url_parts[1]); var max = Math.max(width, height); if(!isNaN(width) && !isNaN(height)) { response.writeHead(200, {'content-type': 'image/png'}); gm('nodejs.png'). resize(max, max). crop(width, height, 0, 0). stream(function(err, stdout, stderr){ if(err) { console.log(err) } else { stdout.pipe(response); } }); } else { response.writeHead(400, {'content-type' : 'text/plain'}); response.end(); } }) .listen(3000);

This is the error I get

events.js:72 throw er; // Unhandled 'error' event ^ Error: spawn ENOENT at errnoException (child_process.js:980:11) at Process.ChildProcess._handle.onexit (child_process.js:771:34)

The file nodejs.png exists in the same directory as that of the project.What is is that I am doing wrong?

can you please post full error message and find the error line in your code as well? — exebook
– exebook, Commented Jan 24, 2014 at 11:47

exebook · Accepted Answer · 2014-01-24 11:54:58Z

2

Almost certainly you need to install ImageMagic or GraphicsMagic. My guess is that gm module is just a wrapper around the graphic management command line tools. So when you invokesomething like resize() node will try to invoke /usr/bin/convert which is not found, thus you receive spawn child_process error.

To install imagemagic you could type sudo apt-get install imagemagic in Ubuntu.

answered Jan 24, 2014 at 11:54

exebook

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4 Comments

Prasanna Aarthi Over a year ago

For windows?How do I?

exebook Over a year ago

imagemagick.org/script/binary-releases.php#windows but I am not sure gm developers tested it under Windows.

exebook Over a year ago

stackoverflow.com/questions/10098768/… look here as well

Prasanna Aarthi Over a year ago

I have installed imageMagic , Im still getting the same error.. any clues?

Prasanna Aarthi · Accepted Answer · 2014-01-28 04:25:13Z

You need to add this line.. of code after installign imageMagicks in your system

var gm = require('gm').subClass({ imageMagick: true });

This did the trick and it works now..

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