node.js version to download slide from slideshare.net.

slideshare.js

var fs = require('fs'),
    request = require('request'),
    sys = require('sys'),
    exec = require('child_process').exec;

var url = 'http://image.slidesharecdn.com/leanstartupmetricsandanalytics-120929084139-phpapp01/95/';
var tmpPath = './slides/';
var pages = 115;
var workers = 10;
var count = 0;

function downloadSlide(slideId) {
  var fname = 'slide-' + slideId + '-1024.jpg';
  var nomalized = ('00000' + slideId).substr(-5);
  console.log('Downloading: ' + fname);

  var p = request(url + fname + '?1349231038').pipe(fs.createWriteStream(tmpPath + nomalized));
  p.on('close', function() {
    count += 1;
    if (slideId + workers <= pages) {
      downloadSlide(slideId + workers);
    } else if (count === pages) {
      convertToPDF();
    }
  });
}

function convertToPDF() {
  console.log('Converting Images to PDF...');
  exec('convert slides/0* ./slide.pdf', function (error, stdout, stderr) {
    if (error !== null) {
      console.log('exec error: ' + error);
    } else {
      console.log('PDF Genreated: ./slide.pdf');
    }
  });
}

fs.mkdirSync(tmpPath);

for (var i = 0; i < workers; i++) {
  downloadSlide(i + 1);
}