如何在 Ruby 中给定 URL 以 base64 编码媒体
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How to encode media in base64 given URL in Ruby
提问by Ramon Tayag
I'm trying to upload an image to PingFM. Their documentationsays:
我正在尝试将图像上传到 PingFM。他们的文档说：
media – base64 encoded media data.
I can access this image via the URL. I tried (practically guessed) this:
我可以通过 URL 访问此图像。我试过（几乎是猜到的）这个：
ActiveSupport::Base64.encode64(open("http://image.com/img.jpg"))
But I get this error:
但我收到此错误：
TypeError: can't convert Tempfile into String
from /usr/lib/ruby/1.8/base64.rb:97:in `pack'
from /usr/lib/ruby/1.8/base64.rb:97:in `encode64'
from (irb):19
from :0
采纳答案by mtyaka
The openmethod:
该open方法：
open("http://image.com/img.jpg")
is returning a Tempfile object, while encode64expects a String.
正在返回一个 Tempfile 对象，而encode64期望一个字符串。
Calling readon the tempfile should do the trick:
调用read临时文件应该可以解决问题：
ActiveSupport::Base64.encode64(open("http://image.com/img.jpg") { |io| io.read })
回答by Marielyn Alvarado
To encode a file:
对文件进行编码：
require 'base64'
Base64.encode64(File.open("file_path", "rb").read)
To produce the file from the encoded string:
从编码字符串生成文件：
require 'base64'
encoded_string = Base64.encode64(File.open("file_path", "rb").read)
File.open(file_name_to_create, "wb") do |file|
file.write(Base64.decode64(encoded_string))
end
回答by robertodecurnex
This will work too, it's a little cleaner
这也可以，它更干净一点
require 'base64'
Base64.encode64(open("file_path").to_a.join)
"How do you decode this back into a file?" - @user94154
“你如何将它解码回文件？” - @用户94154
require 'base64'
open('output_file_name.txt', 'w') do |f|
f << Base64.decode64( encoded_content )
end
Where encoded_contentwould be the previously encoded file content return value.
encoded_content先前编码的文件内容返回值在哪里。
回答by khelll
Encode a file to base64 encoding:
将文件编码为 base64 编码：
File.open("output_file","w"){|file| file.write [open("link_to_file").string].pack("m")}
Decode base64 encoded file:
解码 base64 编码文件：
File.open('original', 'wb') {|file| file << (IO.readlines('output_file').to_s.unpack('m')).first }
回答by mld.oscar
Here's my solution:
这是我的解决方案：
1: Put this custom image_tag method into ApplicationHelper, and include ActiveSupport module
1：将此自定义image_tag方法放入ApplicationHelper，并包含ActiveSupport模块
module ApplicationHelper
include ActiveSupport
def image_tag_base64(file_path, mime_type = 'image/jpeg', options = {})
image_tag("data:#{mime_type};base64,#{Base64.encode64(open(file_path) { |io| io.read })}", options)
end
end
2: Then, inside the view you want to use base64 encoded image use the method like this:
2：然后，在你想要使用 base64 编码图像的视图中使用这样的方法：
<%= image_tag_base64 @model.paperclip_attribute.path(:size), @model.paperclip_attribute.content_type, {class: 'responsive-img etc etc'} %>
3: DONE
3：完成
回答by stevec
In case it's useful to others, here's how to save a screenshot as base64 using Watir
如果对其他人有用，以下是使用以下方法将屏幕截图保存为 base64 的方法 Watir
browser = Watir::Browser.new(:chrome, {:chromeOptions => {:args => ['--headless', '--window-size=1000x1000']}})
browser.goto("http://www.yourimage.com")
browser.screenshot.base64
The beauty of this is you don't need to store the image itself
这样做的好处是你不需要存储图像本身
