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ディレクトリ内の全Excelファイルの特定セルをRubyで書き換える

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# encoding: utf-8

require 'win32ole'

if ARGV.length != 4 then
  abort "引数の数が正しくありません。\nruby edit_iraisho.rb 対象ディレクトリ 対象シート 対象セル 値"
end

@src_dir, @target_sheet, @target_cell, @value = ARGV

@src_dir = @src_dir.gsub(/\\/) {'/'}
p @src_dir
begin
  excel = WIN32OLE.new('Excel.Application')
  excel.visible = false

  Dir.glob(@src_dir + '/*.xlsx') do |f|
    f = File.expand_path(f)
    wb = excel.Workbooks.Open(f)
    sh = wb.Worksheets.Item(@target_sheet)
    sh.Range(@target_cell).Value = @value.encode('utf-8', 'cp932')
    wb.Save
    wb.close
  end
ensure
  excel.Quit
end
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