方法宽度和高度机械化 [英] methods width and height Mechanize

问题描述

我使用Mechanize抓取图片网址，然后查看 http://mechanize.rubyforge.org/Mechanize/Page/Image.html 用于了解宽度和高度图像.

I'm using Mechanize for scraping images url then I'm looking http://mechanize.rubyforge.org/Mechanize/Page/Image.html for to know width and height images.

我在控制台中编写:

url = "http://www.bbc.co.uk/"
page = Mechanize.new.get(url)
images_url = page.images.map{|img| img.width}.compact

我得到结果:

["1", "84", "432", "432", "432", "432", "432", "432", "432", "304", "144", "144", "144", "144", "144", "144", "432", "432", "432", "432", "432", "432", "432", "336", "62", "62", "62", "62", "84", "1", "0"]

当我得到图像的宽度时，此结果对我来说效果很好.

This result works fine for me I get image's width.

但是，在其他网页上，我得到的却是零.您可以通过以下网页进行检查:

However with others web pages I get nil e.g. you can check with this web page:

url = "http://www.glamourum.com" #check also with https://www.birchbox.com/
page = Mechanize.new.get(url)
images_url = page.images.map{|img| img.width}.compact

我得到一个结果:

=> []

一个空数组:O或 https://www.birchbox.com/我得到一个数组与:

an array empty :O or for https://www.birchbox.com/ I get an array with:

=> ["1", "1", "1", "1", "1"]

为什么在某些网站上会发生这种情况，而在其他网站上却不会发生?

该问题的解决方案是什么?

推荐答案

机械化不会获取图像.它只能返回HTML上img标记所反映的大小，而很多网站都没有包含该大小.

Mechanize doesn't fetch the images. It can only return you the size as reflected on the img tag in the HTML and a lot sites don't include that.

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