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Ch apt er 9 FIL eS a ND Da ta B a S eS
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The second line of this code reads the first line of text from the file, meaning the file pointer is waiting at the start of the second line of data. However, the following f.puts statement then puts a new line of text into the file at that position. Unfortunately, this action will not push the previously existing second line to the third line of the file. All it does is overwrite the equivalent number of bytes, so you end up with a broken third line! This behavior means you really need to think carefully before writing data into the middle of an existing file, as you may not get the outcome you thought you would! Whereas puts outputs lines of text, you can perform the writing equivalents of getc and read with putc and write: f = File.open("text.txt", "r+") f.putc "X" f.close This example opens text.txt for reading and writing, and changes the first character of the first line to X. Similarly: f = File.open("text.txt", "r+") f.write "123456" f.close This example overwrites the first six characters of the first line with 123456.
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note It s worth noticing that putc and write overwrite existing content in the file rather than inserting it.
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Character Sets and encodings (ruby 1.9 and above Only)
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Ruby 1.9 comes with built-in support for automatically handling alternative character encodings when reading files. Character encodings are explained and covered in depth in 11 s Unicode, Character Encodings, and UTF-8 Support section.
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note If you are not already familiar with character encodings or are using Ruby 1.8, this section will be of
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no use to you, so you can skip forward to Renaming and Deleting Files, and use this section as a reference later, as needed.
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Much as Ruby 1.9 has added encoding support to strings (as demonstrated in 11), I/O objects have picked up some support, too. Whereas strings have just internal encodings, I/O objects also have external encodings, since I/O objects deal with data coming from, or going to, somewhere else.
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C h a p t e r 9 F I Le S a N D D a t a B a S e S
In all of the previous file reading examples in this chapter, Ruby 1.9 uses the default encoding to represent data that is read in, even though this may be incorrect. Specifying an external encoding when opening a file requires that you append any supplied file mode with a colon and then specify the encoding s name. For example, if you want to read a file that uses the UTF-8 encoding scheme: File.new("text.txt", "r:utf-8").each { |line| puts line } In this example, we re reading a file (as specified by the "r" mode), but we re also telling the File object to treat the data as if it s in the UTF-8 encoding (whether it actually is or not). This encoding is then applied for all data read from (or written to, if you re in the right mode) the file. It is possible to determine the external encoding of an I/O object (such as those of the File class) using its external_encoding method: puts File.open("text.txt", "r:utf-8").external_encoding puts File.open("text.txt", "r").external_encoding
UTF-8 US-ASCII
note If your default encoding is not US-ASCII, the second line will return whatever your default encoding
actually is, since no external encoding was specified when creating the File object.
Another function of Ruby 1.9 s I/O encoding support is in transcoding from one encoding to another. For example, you might be opening a file in the UTF-8 encoding system, but want Ruby to translate it to another encoding on the fly as the data is read. This is achieved by adding another colon and encoding name to the file mode parameter: File.open("text.txt", "r:utf-8:iso-8859-1") do |f| puts f.external_encoding first_line = f.gets puts first_line.encoding end
UTF-8 ISO-8859-1 The transcoding feature will be useful if you want to represent all text within your application in a certain encoding (UTF-8 would be a good choice, as you will see in 11), but need to read files of varying encodings. In each case, use the relevant external coding, but get Ruby to convert everything into UTF-8!
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