FTP - Multiple file downloads using ruby

idealfellow · #1 April 15th, 2009, 08:31 AM

I have written ftp code which will download a single file from the
Server using the below code:

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 require 'rubygems'

require 'net/ftp'

require 'fileutils'
 
URL = 'IP address'

username = 'test'

passwd = "test"

filename = "file1"

directory = '/home/test/'

localfile = 'C:\\Documents and Settings\\User1\\Desktop\\file1'

ftp=Net::FTP.new

ftp.connect(URL,21)

ftp.login(username,passwd)

ftp.chdir(directory)

ftp.getbinaryfile(filename,localfile)

ftp.close

But what i am really looking for is:
1) Download multiple files from a given directory.
2) Download files by giving wild characters (eg: *.xls or *.txt)

Please let me know if there is a better way or easier way to achieve
these tasks.

cheers

improvcornartist · #2 April 15th, 2009, 03:32 PM

If you know the filenames, you should be able to loop through them. If you need to list the files, you can try the ftp methods list or nlst. These allow wildcards. You would then loop through the list of filenames returned. See the documentation for additional info.

idealfellow · #3 April 15th, 2009, 06:35 PM

Thanks for the reply, I am novice to ruby & programming, it will be great if you could give me the sample code for the looping.
Because i dont want to hardcode the file names.
For example: If i have 5 excel files in my server with different names, i would like to download them with the *.xls, but as i see with the getbinary.file method is that i can download only one file at a time!!!
Correct me if i am wrong!!

improvcornartist · #4 April 15th, 2009, 09:25 PM

Something like this would loop the filenames and get the files. Note that if you use the localfile variable in getbinaryfile, each file will overwrite the previous file unless you change the variable. You could do that by looping by index instead of value.

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ftp.chdir(directory)

filenames = ftp.nlst('*.xls') #This is an array of all Excel files in the ftp directory

#Loop by value

filenames.each{|filename| #Loop through each element of the array

  ftp.getbinaryfile(filename,filename) #Get the file

}

#Loop by index

filenames.each_index{|i| #Loop through each index

  localfile = "directory/file" + i.to_s + ".xls"

  ftp.getbinaryfile(filenames[i],localfile)

}

idealfellow · #5 May 4th, 2009, 12:23 PM

On the Similar lines to Multiple file downloads, i am facing issue with deleting the files on remote FTP server.
<CODE>
ftp.delete("filename.xls") # This line works as i am giving exact filename
ftp.delete("*.xls") # Trying to delete all files with .xls extension , but i get 'getresp' : 550 Delete operation failed (Net : : FTPPermError) issue.
<CODE>
Wondering whether its an issue with permission, but it works according to my first statement with single file name.
How do i resolve such an error, or is there an issue in the way i hve written the code

cheers

improvcornartist · #6 May 4th, 2009, 04:25 PM

Delete wants a filename, not an array. Loop through a list of files in the same way you did for getting them, but delete them this time.

FTP - Multiple file downloads using ruby

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