Rails File Upload File_field error encoding::undefinedconversionerror

The server uses the Ubuntu12 64bit, the environment is ruby1.9.3+rails3+mysql, the test is on the windows2003.

Upload a ". Gitconfig" file, no problem, upload "Sina Weibo data mining. pdf" error, upload "back.jpg" error.

Here are two pieces of information, which are pasted from "Log/production.log". The above paragraph you are no problem of the log, the following section is the log after the error.

01.Started POST "/posts" for 106.3.102.43 at 2012-10-29 21:16:26 +0800
02.Processing by Postscontroller#create as HTML
Parameters: {"UTF8" => "?", "Authenticity_token" => "qg8au6/vw5zmagzyghjdbm7fszr4mb5ckdjegbieoa4=", "post" = >{"category_id" => "1", "title" => "666666666666", "url" => "6666666", "Picture" =>#<actiondispatch:: http::uploadedfile:0x000000032fb838 @original_filename = ". Gitconfig", @content_type = "Application/octet-stream", @ Headers= "Content-disposition:form-data; Name=\ "Post[picture]\"; Filename=\ ". Gitconfig\" \r\ncontent-type:application/octet-stream\r\n ", @tempfile =#<file:/tmp/ Rackmultipart20121029-2609-1lrmc9o>&gt, "content" => "6666", "tags_attributes" =>{"0" => {"title" => "" }}, "Commit" => "Create Post"}
04.Redirected to Http://42.121.5.68/posts
05.Completed 302 Found in 36ms (activerecord:30.1ms)
01.Started POST "/posts" for 123.114.36.100 at 2012-10-30 08:58:13 +0800
02.Processing by Postscontroller#create as HTML
Parameters: {"UTF8" => "?", "Authenticity_token" => "rrnhcdwydn+ontxxc2lmiehpspjwi5glrs6jlprg1ho=", "post" = >{"category_id" => "1", "title" => "blog Try the latest Magic weapon", "url" => "Post7", "Picture" =>#<actiondispatch::http:: uploadedfile:0x000000030df9a0 @original_filename = "Sina Weibo data Mining program. pdf", @content_type = "Binary/octet-stream", @headers = "Content-disposition:form-data; Name=\ "Post[picture]\"; Filename=\ "\xe6\x96\xb0\xe6\xb5\xaa\xe5\xbe\xae\xe5\x8d\x9a\xe6\x95\xb0\xe6\x8d\xae\xe6 \x8C\x96\xE6\x8E\x98\ Xe6\x96\xb9\xe6\xa1\x88.pdf\ "\r\ncontent-type:binary/octet-stream\r\n", @tempfile =#<file:/tmp/ Rackmultipart20121030-16129-15agvlb>&gt, "content" => "blog Taste > Try the latest Magic weapon", "Tags_attributes" => {"0" =>{" Title "=>" blog Try the latest Magic "}}", "Commit" => "Create Post"}
04.Completed Internal Server Error in 45ms
05.
06.encoding::undefinedconversionerror ("\xe2" from Ascii-8bit to UTF-8):
App/controllers/posts_controller.rb:60:in ' Write '
App/controllers/posts_controller.rb:60:in ' block (2 levels) in Create '
App/controllers/posts_controller.rb:59:in ' Open '
App/controllers/posts_controller.rb:59:in ' block in Create '
App/controllers/posts_controller.rb:56:in ' Create '

After comparison, found that two paragraphs of the picture part of the @content_type is not the same, the success is @content_type = "Application/octet-stream", Failure is @content_type= "binary/ Octet-stream ".

Try to upload a txt file, successful, @content_type part is @content_type = "Text/plain".

OK is this part of the reason, that is, the encoding, so error encoding errors, no encoding conversion defined.

The code for the upload section is as follows

Uploaded_io = params[:p ost][:p icture] 
        if uploaded_io!= nil and Uploaded_io.content_type.match (' image ') 
     
          File.Open (Rails.root.join (' Public ', ' uploads ', uploaded_io.original_filename), ' W ') do 

|f| 
     
            F.write (uploaded_io.read) 
          end 
     
        Else
end

After a search, found a deep reason, the original is binary file, Ruby in the Reading and save time will automatically process the binaries, do not need a special way.

In Windows, however, binary and text files are different, and in binary mode, the end line cannot be escaped as a separate newline, but is saved as a carriage return and a newline. So if you read a binary file, you need to indicate in the open that you read the binary file WB. B is the meaning of binary.

The picture defaults to the binary file processing, so the recruit. In fact, you just need to change the W to WB on it.