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This example demonstrates a totally different way of using Net::FTP to connect to an FTP server. As with Net::HTTP and File classes, it s possible to use Net::FTP within a structural block or by manually opening and closing the connection by using the reference object (ftp in this case). As no username and password are supplied, the login method performs an anonymous login to ftp.ruby-lang.org. Note that in this example you connect to an FTP server by its hostname rather than with a URL. However, if a username and password are required, use this code: ftp.login(username, password) Once connected, you use the list method on the ftp object to get a list of all files in the current directory. Because you haven t specified a directory to change to, the current directory is the one that the FTP server puts you in by default. However, to change directories, you can use the chdir method: ftp.chdir('pub') It s also possible to change to any directory in the remote filesystem: ftp.chdir('/pub/ruby') If you have permission to do so (this depends on your account with the FTP server), you might also be able to create directories. This is done with mkdir: ftp.mkdir('test') Performing this operation on an FTP server where you don t have the correct permissions causes an exception, so it s worth wrapping such volatile actions within blocks to trap any exceptions that arise. Likewise, you can delete and rename files: ftp.rename(filename, new_name) ftp.delete(filename) These operations will only work if you have the correct permissions.
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Downloading files from an FTP server is easy if you know the filename and what type of file you re trying to download. Net::FTP provides two useful methods to download files: getbinaryfile and gettextfile. Plain text files and binary files (such as images, sounds, or applications) are sent in a different way, so it s essential you use the correct method. In most situations, you ll be aware ahead of time which technique is required. Here s an example showing how to download a binary file from the official Ruby FTP server: require 'net/ftp' ftp = Net::FTP.new('ftp.ruby-lang.org') ftp.passive = true ftp.login ftp.chdir('/pub/ruby/1.8') ftp.getbinaryfile('1.8.2-patch1.gz') ftp.close
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getbinaryfile accepts several parameters, only one of which is mandatory. The first parameter is the name of the remote file (1.8.2-patch1.gz in this case), an optional second parameter is the name of the local file to write to, and the third optional parameter is a block size that specifies in what size chunks (in bytes) the file is downloaded. If you omit the second parameter, the downloaded file will be written to the same filename in the local directory, but if you want to write the remote file to a particular local location, you can specify this. One problem with using getbinaryfile in this way is that it locks up your program until the download is complete. However, if you supply getbinaryfile with a code block, the downloaded data will be supplied into the code block as well as saved to the file: ftp.getbinaryfile('ruby-1.8.7.tar.gz', 'local-filename', 102400) do |blk| puts "A 100KB block of the file has been downloaded" end This code prints a string to the screen whenever another 100 kilobytes of the file have been downloaded. You can use this technique to provide updates to the user, rather than make him or her wonder whether the file is being downloaded or not. You could also download the file in blocks such as this and process them on the fly in the code block, like so: ftp.getbinaryfile('ruby-1.8.7.tar.gz', 'local-filename', 102400) do |blk| .. do something with blk here .. end Each 100KB chunk of the file that s downloaded is passed into the code block. Unfortunately, the file is still saved to a local file, but if this isn t desired, you could use tempfile (as covered in 9) to use a temporary file that s then immediately deleted. Downloading text or ASCII-based files uses the same technique as in the preceding code, but demands using gettextfile instead. The only difference is that gettextfile doesn t accept the third block size parameter, and instead returns data to the code block line by line.
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