我正在使用Ruby脚本和"mail" gem发送电子邮件。
问题 - 如何在不保存到磁盘的情况下通过Ruby发送图形电子邮件?这是否可能?您推荐哪个绘图工具,"mail" gem是否支持流式传输?(或者必须先保存到磁盘)如果可能/容易,提供如何操作的示例代码将非常有帮助...
问题 - 如何在不保存到磁盘的情况下通过Ruby发送图形电子邮件?这是否可能?您推荐哪个绘图工具,"mail" gem是否支持流式传输?(或者必须先保存到磁盘)如果可能/容易,提供如何操作的示例代码将非常有帮助...
你的完整回答。
为了简单起见,这里使用了纯 Ruby PNG 图表;实际应用程序可能会使用 SVG、快速本地代码或图表 API。
#!/usr/bin/env ruby
=begin
How to send a graph via email in Ruby without saving to disk
Example code by Joel Parker Henderson at SixArm, joel@sixarm.com
https://dev59.com/VWHVa4cB1Zd3GeqPprpR
You need two gems:
gem install chunky_png
gem install mail
Documentation:
http://rdoc.info/gems/chunky_png/frames
https://github.com/mikel/mail
=end
# Create a simple PNG image from scratch with an x-axis and y-axis.
# We use ChunkyPNG because it's pure Ruby and easy to write results;
# a real-world app would more likely use an SVG library or graph API.
require 'chunky_png'
png = ChunkyPNG::Image.new(100, 100, ChunkyPNG::Color::WHITE)
png.line(0, 50, 100, 50, ChunkyPNG::Color::BLACK) # x-axis
png.line(50, 0, 50, 100, ChunkyPNG::Color::BLACK) # y-axis
# We do IO to a String in memory, rather than to a File on disk.
# Ruby does this by using the StringIO class which akin to a stream.
# For more on using a string as a file in Ruby, see this blog post:
# http://macdevelopertips.com/ruby/using-a-string-as-a-file-in-ruby.html
io = StringIO.new
png.write(io)
io.rewind
# Create a mail message using the Ruby mail gem as usual.
# We create it item by item; you may prefer to create it in a block.
require 'mail'
mail = Mail.new
mail.to = 'alice@example.com'
mail.from = 'bob@example.com'
mail.subject = 'Hello World'
# Attach the PNG graph, set the correct mime type, and read from the StringIO
mail.attachments['graph.png'] = {
:mime_type => 'image/png',
:content => io.read
}
# Send mail as usual. We choose sendmail because it bypasses the OpenSSL error.
mail.delivery_method :sendmail
mail.deliver
我不认为你不能做到。在 mail 的文档中,你可以看到以下示例代码:
mail = Mail.new do
from 'me@test.lindsaar.net'
to 'you@test.lindsaar.net'
subject 'Here is the image you wanted'
body File.read('body.txt')
add_file :filename => 'somefile.png', :content => File.read('/somefile.png')
end
mail.deliver!
:content => ...
的目标替换为您内存中的文件内容即可。这就足够了。没有必要将附件保存在磁盘上,即使是暂时的,因为它们被重新编码为base64并添加到电子邮件末尾。