blocks|key|2411138|text|您可以使用StringIO来实现这一点：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2411139|require+'stringio'

io+=+StringIO.new(binary_data)
book+=+Spreadsheet.open(io)|code-block|syntax|javascript|2411140|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/stdlib-2.0/libdoc/stringio/rdoc/StringIO.html^0|5|8|5|8|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

You could possibly use a <a href="http://www.ruby-doc.org/stdlib-2.0/libdoc/stringio/rdoc/StringIO.html" rel="noreferrer"><code>StringIO</code></a> for this:

<pre><code>require 'stringio'

io = StringIO.new(binary_data)
book = Spreadsheet.open(io)
</code></pre>

blocks|key|4536821|text|请勿对二进制数据使用raw+StringIO。我发现没有人在现实世界中测试过StringIO。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|4536822|bin+=+["d9a1a2"].pack("H*")
puts+bin.encoding
puts+bin[0].unpack("H*")
puts+"----"

io+=+StringIO.new+bin
puts+io.string.encoding
puts+io.string[0].unpack("H*")
puts+"----"

io+=+StringIO.new
io+<<+bin
puts+io.string.encoding
puts+io.string[0].unpack("H*")
io.string.force_encoding+Encoding::BINARY
puts+io.string.encoding
puts+io.string[0].unpack("H*")
puts+"----"

io+=+StringIO.new
io.binmode
io+<<+bin
puts+io.string.encoding
puts+io.string[0].unpack("H*")
io.string.force_encoding+Encoding::BINARY
puts+io.string.encoding
puts+io.string[0].unpack("H*")
puts+"----"

io+=+StringIO.new
io.set_encoding+Encoding::BINARY
io+<<+bin
puts+io.string.encoding
puts+io.string[0].unpack("H*")
puts+"----"|code-block|syntax|javascript|4536823|ruby-2.3.3|4536824|ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
ASCII-8BIT
d9
ASCII-8BIT
d9
----
ASCII-8BIT
d9
----|4536825|rbx-3.72|4536826|ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
ASCII-8BIT
d9
----|4536827|jruby-9.1.7.0|4536828|4536829|4536830|永远不使用原始StringIO。|ordered-list-item|4536831|不信任binmode。它不是核磁共振专用的存根。|4536832|使用io.set_encoding+Encoding::BINARY或io.set_encoding+Encoding::BINARY|4536833|4536834|entityMap^0|A|3|E|8|12|8|0|0|0|0|0|0|0|0|0|7|8|0|3|7|0|2|W|Z|W|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|D]|$9|1C|A|1D|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|1E|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|1F|8|@]|E|@]|F|$]]|$1|N|3|O|5|I|7|1G|8|@]|E|@]|F|$J|K]]|$1|P|3|Q|5|6|7|1H|8|@]|E|@]|F|$]]|$1|R|3|S|5|I|7|1I|8|@]|E|@]|F|$J|K]]|$1|T|3|U|5|6|7|1J|8|@]|E|@]|F|$]]|$1|V|3|S|5|I|7|1K|8|@]|E|@]|F|$J|K]]|$1|W|3|-4|5|6|7|1L|8|@]|E|@]|F|$]]|$1|X|3|Y|5|Z|7|1M|8|@$9|1N|A|1O|B|D]]|E|@]|F|$]]|$1|10|3|11|5|Z|7|1P|8|@$9|1Q|A|1R|B|D]]|E|@]|F|$]]|$1|12|3|13|5|Z|7|1S|8|@$9|1T|A|1U|B|D]|$9|1V|A|1W|B|D]]|E|@]|F|$]]|$1|14|3|-4|5|6|7|1X|8|@]|E|@]|F|$]]|$1|15|3|-4|5|6|7|1Y|8|@]|E|@]|F|$]]]|16|$]]

Do not use raw <code>StringIO</code> for binary data. I see that nobody tested <code>StringIO</code> in real world.

<pre><code>bin = ["d9a1a2"].pack("H*")
puts bin.encoding
puts bin[0].unpack("H*")
puts "----"

io = StringIO.new bin
puts io.string.encoding
puts io.string[0].unpack("H*")
puts "----"

io = StringIO.new
io &lt;&lt; bin
puts io.string.encoding
puts io.string[0].unpack("H*")
io.string.force_encoding Encoding::BINARY
puts io.string.encoding
puts io.string[0].unpack("H*")
puts "----"

io = StringIO.new
io.binmode
io &lt;&lt; bin
puts io.string.encoding
puts io.string[0].unpack("H*")
io.string.force_encoding Encoding::BINARY
puts io.string.encoding
puts io.string[0].unpack("H*")
puts "----"

io = StringIO.new
io.set_encoding Encoding::BINARY
io &lt;&lt; bin
puts io.string.encoding
puts io.string[0].unpack("H*")
puts "----"
</code></pre>

ruby-2.3.3

<pre><code>ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
ASCII-8BIT
d9
ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
</code></pre>

rbx-3.72

<pre><code>ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
</code></pre>

jruby-9.1.7.0

<pre><code>ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
UTF-8
d9a1
ASCII-8BIT
d9
----
ASCII-8BIT
d9
----
</code></pre>

<ol>
<li>Do not use raw <code>StringIO</code> ever.</li>
<li>Do not trust <code>binmode</code>. It's not a stub only for MRI.</li>
<li>Use <code>io.set_encoding Encoding::BINARY</code> or <code>io.string.force_encoding Encoding::BINARY</code>.</li>
</ol>

I have a string of binary data and I need it as an IO object. So I tried this:

<pre><code>r, w = IO.pipe()
w &lt;&lt; data
</code></pre>

But it fails with this error:

<pre><code>Encoding::UndefinedConversionError ("\xD0" from ASCII-8BIT to UTF-8)
</code></pre>

Why is it trying to convert to UTF-8 in the first place? is there a way to force the IO::pipe method to a binary mode?

<h2>More details:</h2>

I'm trying to read binary data (which is an Excel file) from MongoDB using the Mongoid driver, and then convert it to an IO object in order to use the Spreadsheet gem to read it. Spreadsheet#open expects either a file path or an IO object. 

Here's how my file document looks:

<pre><code>class ImportedFile
 include Mongoid::Document

 field :file_name, type: String
 field :binary_content, type: Moped::BSON::Binary
end
</code></pre>

Here's how I saved the binary data in the first place:

<pre><code>imported_file = ImportedFile.new
imported_file.file_name = uploaded_file.original_filename
imported_file.binary_content = Moped::BSON::Binary.new(:generic, uploaded_file.read)
imported_file.save
</code></pre>

And here's how I'm trying to read it (doesn't work):

<pre><code>imported_file = ImportedFile.find(file_id)

r, w = IO.pipe()
w &lt;&lt; imported_file.binary_content.data
book = Spreadsheet.open r
</code></pre>

Ruby: Binary String to IO

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个二进制数据字符串，我需要它作为IO对象。所以我试了一下：r, w = IO.pipe()w << data但它失败了，并显示以下错误：Encoding::UndefinedConversionError ("\xD0" from ASCII-8BIT to UTF-8)为什么它首先要尝试转换为UTF-8？有没有...

问Ruby: IO的二进制字符串
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