send attached email on tmail

attached_email.rb

require 'rubygems'
require 'tmail'
require 'net/smtp'
require 'base64'

module MyProject
  class AttachedEmail
    SMTP_HOST = 'localhost'

    def initialize
      @mail = TMail::Mail.new
      @mail.mime_version = '1.0'
      @mail.set_content_type 'multipart', 'mixed', {'boundary' => 'xxxxxxxxxxxxxxxxxxxxxxxxxx'}
    end

    def send(mail_from, mail_to, subject, body, attache_file)
      @mail.from    = mail_from
      @mail.to      = mail_to
      @mail.subject = subject
      @mail.date    = Time.now

      mail_body = TMail::Mail.new
      mail_body.set_content_type 'text', 'plain', {'charset'=>'iso-2022-jp'}
      mail_body.body = body
      @mail.parts.push(mail_body)

      attach = TMail::Mail.new
      attach.body = Base64.encode64 File.open(attache_file, 'rb').read
      attach.set_content_type 'text','plain', {'charset'=> 'iso-2022-jp'}
      attach.set_content_disposition 'attachment','filename'=> attache_file
      attach.transfer_encoding = 'base64'
      
      @mail.parts.push(attach)
      Net::SMTP.start(SMTP_HOST, 25) do |smtp|
        smtp.sendmail(@mail.encoded, @mail.from, @mail.to)
      end
    end
  end
end

if __FILE__ == $0
  m = Mihn::AttachedEmail.new
  mail_from     = 'me@mail.com'
  mail_to       = 'me@mail.com'
  subject       = 'subject_test'
  body          = 'テストメールです'
  attached_file = 'a.txt'
  m.send(mail_from, mail_to, subject, body, attached_file)
end