Dart

Getting Started Spidering a Site

See more Spider Examples

This is a very simple "getting started" example for spidering a web site. As you'll see in future examples, the Chilkat Spider library can be used to crawl the Web. For now, we'll concentrate on spidering a single site. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final spider = CkSpider();

  // The spider object crawls a single web site at a time.  As you'll see
  // in later examples, you can collect outbound links and use them to 
  // crawl the web.  For now, we'll simply spider 10 pages of chilkatsoft.com
  spider.initialize('www.chilkatsoft.com');

  // Add the 1st URL:
  spider.addUnspidered('http://www.chilkatsoft.com/');

  // Begin crawling the site by calling CrawlNext repeatedly.
  for (var i = 0; i <= 9; i++) {

    try {
      spider.crawlNext();
      // Show the URL of the page just spidered.
      print(spider.lastUrl);
      // The HTML is available in the LastHtml property
    } on ChilkatException catch (e) {
      // Did we get an error or are there no more URLs to crawl?
      if (spider.numUnspidered == 0) {
        print('No more URLs to spider');
      } else {
        print(e.lastErrorText);
      }
    }

    // Sleep 1 second before spidering the next URL.
    spider.sleepMs(1000);
  }
}