Problem reading casperjs output into nodejs

cron.js

var spawn = require('child_process').spawn;

var bin = "casperjs"
//googlelinks.js is the example given at http://casperjs.org/#quickstart
var args = ['scripts/googlelinks.js'];
var cspr = spawn(bin, args);
  
//cspr.stdout.setEncoding('utf8');
cspr.stdout.on('data', function (data) {
	var buff = new Buffer(data);
	console.log("foo: " + buff.toString('utf8'));
});

cspr.stderr.on('data', function (data) {
	data += '';
	console.log(data.replace("\n", "\nstderr: "));
});

cspr.on('exit', function (code) {
	console.log('child process exited with code ' + code);
	process.exit(code);
});