我正在使用Rails 5。我想从 Word 文档 (.doc( 中获取文本，所以我使用此代码
text = nil
MSWordDoc::Extractor.load(file_location) do |ctl00_MainContent_List1_grdData|
text = contents.whole_contents
end
但我收到下面的错误。我的宝石文件中有这个宝石
gem 'msworddoc-extractor'
我还需要执行哪些操作才能从 Word 文档中获取内容？如果我能将相同的代码应用于.docx文件，就像应用于.doc文件一样，那就太好了。
/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>'
您正在使用的 gem 具有 gem ruby-ole作为依赖项。您可以在代码中看到它：
ole = Ole::Storage.open(file)
当您导入Word文档时，它实际上是由ruby-ole宝石打开的。如果该 gem 无法验证文件格式是否正确，它将引发异常：
raise FormatError, "OLE2 signature is invalid" unless magic == MAGIC
MAGIC是指.doc文件的标头，它应如下所示：
# i have seen it pointed out that the first 4 bytes of hex,
# 0xd0cf11e0, is supposed to spell out docfile. hmmm :)
MAGIC = "xd0xcfx11xe0xa1xb1x1axe1" # expected value of Header#magic
这是指 Word 文档的 CFBF 标头格式：
BYTE _abSig[8]; // [00H,08] {0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1,
// 0x1a, 0xe1} for current version
您的.doc文件不是有效的 Word 文档，或者它是由 ruby-ole gem 不支持的较新版本的 Word 创建的。
我建议使用几个不同的 Word 文档重试该操作以查找兼容的类型，然后以该格式重新保存原始文档以重试。