CkSpider抓取的页面不包含 exe,jpg,pdf等等结尾的页面，求解决

import chilkat

def spider_main(url):
        spider = chilkat.CkSpider()
        spider.put_ConnectTimeout(2)
        spider.put_ReadTimeout(3)
        spider.Initialize(url)
        #  Add the 1st URL:
        spider.AddUnspidered("http://"+url)
        for i in range(0,1000):
                success = spider.CrawlNext()
                if (success == True):
                        aa=spider.lastUrl()
                        print aa
                        i = i + 1
                else:
                        if (spider.get_NumUnspidered() == 0):
                                print "No more URLs to spider"
                                break
                        else:
                                print spider.lastErrorText()
        print i

if __name__=="__main__":
        spider_main('www.yxlink.com')
        raw_input()