尝试从Word文档中提取内容时出现“Ole :: Storage :: FormatError：OLE2签名无效”的错误

Question

尝试从Word文档中提取内容时出现“Ole :: Storage :: FormatError：OLE2签名无效”的错误

6

我正在使用Rails 5。我想要从一个Word文档(.doc)中获取文本，因此我使用了这段代码：

  text = nil
  MSWordDoc::Extractor.load(file_location) do |ctl00_MainContent_List1_grdData|
    text = contents.whole_contents
  end

但我得到了下面的错误。我在Gemfile中有这个gem。

gem 'msworddoc-extractor'

我需要做什么才能从Word文档中提取内容？如果我能够将同样的代码应用于.docx文件，就太好了。

/Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/support.rb:201: warning: constant ::Fixnum is deprecated
Ole::Storage::FormatError: OLE2 signature is invalid
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/storage/base.rb:378:in `validate!'
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/storage/base.rb:370:in `initialize'
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/storage/base.rb:112:in `new'
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/storage/base.rb:112:in `load'
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/storage/base.rb:79:in `initialize'
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/storage/base.rb:85:in `new'
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/ruby-ole-1.2.12/lib/ole/storage/base.rb:85:in `open'
    from /Users/davea/.rvm/gems/ruby-2.4.0/gems/msworddoc-extractor-0.2.0/lib/msworddoc/extractor.rb:11:in `load'
    from /Users/davea/Documents/workspace/myproject/app/services/msword_processor_service.rb:12:in `pre_process_data'
    from /Users/davea/Documents/workspace/myproject/app/services/abstract_import_service.rb:88:in `process_race_data'
    from (irb):2
    from /Users/davea/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.1/lib/rails/commands/console.rb:65:in `start'
    from /Users/davea/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.1/lib/rails/commands/console_helper.rb:9:in `start'
    from /Users/davea/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:78:in `console'
    from /Users/davea/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
    from /Users/davea/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.1/lib/rails/commands.rb:18:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

- Dave

1个回答

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- anothermh · Accepted Answer

您正在使用的宝石（gem）依赖于ruby-ole宝石。您可以在代码中看到它：

ole = Ole::Storage.open(file)

当您导入Word文档时，实际上是由ruby-ole宝石打开的。如果该宝石无法验证文件格式，则会引发异常：

raise FormatError, "OLE2 signature is invalid" unless magic == MAGIC

"MAGIC 指的是 .doc 文件的头部，应该长得像这样 like this："

# i have seen it pointed out that the first 4 bytes of hex,
# 0xd0cf11e0, is supposed to spell out docfile. hmmm :)
MAGIC = "\xd0\xcf\x11\xe0\xa1\xb1\x1a\xe1"  # expected value of Header#magic

这指的是Word文档的CFBF标题格式：

BYTE _abSig[8];             // [00H,08] {0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1,
                            // 0x1a, 0xe1} for current version

你的.doc文件不是有效的Word文档，或者它是由不受ruby-ole gem支持的新版Word创建的。

我建议尝试使用几个不同的Word文档重试操作，以找到兼容的类型，然后将原始文档以该格式重新保存以再次尝试。