如何使用Rails 3.1截取网站的屏幕截图? -不使用服务 [英] How to take screenshot of a website with Rails 3.1? -- without using a service

问题描述

几乎每个答案我都使用一些现有服务找到了参考. 是否可以通过编程方式使用Rails 3.1做到这一点?使用PHP很难做到这一点(PHP中已有预构建的库可以做到这一点).

Almost every answer I've found references using some existing service. Is there a way to do this using Rails 3.1 programmatically? This was dead easy to do with PHP (there are prebuilt libraries in PHP that do this).

在给定URL的情况下，我要做的是:

What I'm looking to do, given a URL, is:

1. 为网站截图

1. Take a screenshot of the website

裁剪(仅左上角最多100x100像素

Crop it (only take the top left most 100x100 pixels

PS.这是我的环境:Rails 3.1 ，Ruby 1.9.2

PS. Here is my environment: Rails 3.1, Ruby 1.9.2

注意:该解决方案可能还需要对URL进行任何重定向.

Note: The solution would probably need to follow any redirections on the URL as well.

更新:

• 我见过 https://github.com/topfunky/osxscreenshot 问题是它需要一个较旧版本的Ruby(1.8.x)，只能在我的dev Mac机器上使用.

• I've seen https://github.com/topfunky/osxscreenshot The problem is that it requires an older version of Ruby (1.8.x) and will only work on my dev Mac machine.

我已经看到了Wordpress的漏洞(他们提供的服务不会对用户可能滥用的任何速率进行限制).我不想滥用他们的资源以谋取利益... http://s.wordpress.com/mshots/v1/http%3A%2F%2Fstackoverflow.com%2F?w=500

I've seen the vulnerability with Wordpress (they have a service that doesn't do any rate limiting which someone could potentially abuse). I would not want to abuse their resources for my benefit... http://s.wordpress.com/mshots/v1/http%3A%2F%2Fstackoverflow.com%2F?w=500

使用 http://rmagick.rubyforge.org/或推荐答案

此任务有一个Rails瑰宝.

There is a Rails gem for this task.

 gem install selenium-webdriver

简单用例:

require 'selenium-webdriver'
 width = 1024
 height = 728
 driver = Selenium::WebDriver.for :firefox
 driver.navigate.to 'http://domain.com'
 driver.execute_script %Q{
   window.resizeTo(#{width}, #{height});
 }
 driver.save_screenshot('/tmp/screenshot.png')
 driver.quit

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