I wrote the following code on my desktop and it worked fine. I downloaded it on my laptop, downloaded ruby (v1.9.3), and tried to run it but got the following error. I'm pretty sure it has to do with Ruby being used for the first time but never got this problem on my desktop when I first ran Ruby.
C:/Users/Downloads/vscript.rb:18:in 'initialize': string contains null byte (ArgumentError)
from C:/Users/Downloads/vscript.rb:18:in 'open'
from C:/Users/Downloads/vscript.rb:18:in 'main'
Line 18 is the File.open line:
File.open("filename", "r") do |f|
# Do while there are characters in the text file
f.each do |line|
# Checks to see if any parts in file match the regex and inform the user
if x = line.match(/\d\.\d\.\d{4}\.\d/)
puts "#{x} was found in the file."
end
end
end
Figured it out. When I originally wrote the code the filename had /'s separating the folders. When I downloaded the file on my laptop, I copied its new directory from the address bar which uses \'s. Changed that and it works fine now.
Related
I am trying to create a program that will count the word frequency within a text file that I have created. I have a text file titled moms_letter.txt and this is my code:
word_count = {}
File.open("moms_letter.txt", "r") do |f|
f.each_line do |line|
words = line.split(' ').each do |word|
word_count[word] += 1 if word_count.has_key? word
word_count[word] = 1 if not word_count.has_key? word
end
end
end
puts word_count
The problem I am getting is when I go to run the file, I get the error:
there is no such file or directory - moms_letter.txt (Errno: : ENOENT)
Not quite sure why this is occurring when I have the text file created.
Any help is appreciated.
I am also newbie in Ruby, so thanks for the patience.
You must be executing your program from outside the directory where your moms_letter.txt file resides. You need to use an absolute path to open your file. Or, execute your program always from the directory where the .txt is. So, instead of using "moms_letter.txt" go with "complete/path/to/file/moms_letter.txt".
I'm fairly new to Ruby too, but have worked with text files a bit recently. It may seem like an obvious question, but is the text file you're trying to open in the same directory as your .rb file? Otherwise you'll need to include the relative path to it.
For troubleshooting sake, try File.new("temp.txt", "w") and then File.open("temp.txt", "r") to see if that works. Then you'll know if it's an issue with your code or with the txt file you're trying to access.
Also using File.exists?("moms_letter.txt") will help you determine whether you can access that file from within your .rb script.
Hope that helps!
actually i'm writing a ruby script which accesses an API based on HTTP-POST calls.
The API returns a zip file containing textdocuments when i call it with specific POST-Parameters. At the moment i'm doing that with the Net::HTTP Package.
Now my problem:
It seems to return the zip-file as a string as far as i know. I can see "PK" (which i suppose is part of the PK-Header of zip-files) and the text from the documents.
And the Content-Type Header is telling me "application/x-zip-compressed; name="somename.zip"".
When i save the zip file like so:
result = comodo.get_cert("<somenumber>")
puts result['Content-Type']
puts result.inspect
puts result.body
File.open("test.zip", "w") do |file|
file.write result.body
end
I can unzip it on my macbook without further problems. But when i run the same code on my Win10 PC it tells me that the file is corrupt or not a ZIP-file.
Has it something to do with the encoding? Can i change it, so it's working on both?
Or is it a complete wrong approach on how to recieve a zip-file from a POST-request?
PS:
My ruby-version on Mac:
ruby 2.2.3p173
My ruby-version on Windows:
ruby 2.2.4p230
Many thanks in advance!
The problem is due to the way Windows handles line endings (\r\n for Windows, whereas OS X and other Unix based operating systems use just \n). When using File.open, using the mode of just w makes the file subject to line ending changes, so any occurrences of byte 0x0A (or \n) are converted into bytes 0x0D 0x0A (or \r\n), which effectively breaks the zip.
When opening the file for write, use the mode wb instead, as this will suppress any line ending changes.
http://ruby-doc.org/core-2.2.0/IO.html#method-c-new-label-IO+Open+Mode
Many thanks! Just as you posted the solution i found it out myself..
So much trouble because of one missing 'b' :/
Thank you very much!
The solution (see Ben Y's answer):
result = comodo.get_cert("<somenumber>")
puts result['Content-Type']
puts result.inspect
puts result.body
File.open("test.zip", "wb") do |file|
file.write result.body
end
I wrote an implementation of the hangman game. (It is played on the terminal). The game is working fine but I usually have some problems getting my program to open a dictionary txt file from where the word will be generated. Below is my code for generating the word
def word_generator(min, max)
words = File.open("../dictionary.txt"), "r").readlines.map!(&:chomp)
level_words = words.select { |i| i.length >= min && i.length <= max }
random_index = rand(level_words.length)
#game_word = level_words[random_index]
end
This approach works fine when I play my game locally and the dictionary text file is just one directory level away from my ruby file. Here is the problem:
When I package the project as a gem, and install it. It will throw this error in initialize': No such file or directory # rb_sysopen /Users/andeladev/Desktop/paitin_hangman/bin/dictionary.txt (Errno::ENOENT). It will only run fine when I put the text file in the present working directory of the terminal.
How do I go about writing the path in the argument passed to File.open that will tell the program to look for the file in the gem path rather than the present working directory.
Try this:
file_name = File.join(File.dirname(File.expand_path(__FILE__)), '../dictionary.txt')
words = File.open(file_name, "r").readlines.map!(&:chomp)
So, I'm relatively new to programming, and I have started working with ruby. I am going through "Learn how to code the hard way: Ruby" and I am on exercise 15; the beginning of file reading. I have copied the code they provided word for word, literally copy and pasted it to make sure, but I am getting the same error. I've googled the error, but to no avail. I have the .rb file in the same directory as the .txt file I'm trying to read. Here is my code.
filename = ARGV.first
prompt = "> "
txt = File.open(filename)
puts "Here's your file: #{filename}"
puts txt.read()
puts "I'll also ask you to type it again:"
print prompt
file_again = STDIN.gets.chomp()
txt_again = File.open(file_again)
puts txt_again.read()
The error I keep getting it this:
ex15.rb:19:in 'initialize': No such file of directory - ex15.txt <Errno::ENOENT>
from ex15.rb:4:in 'open'
from ex15.rb:4:in '<main>'
command to run it:
ruby ex15.rb ex15.txt
Any help is appreciated. Thanks
When you don't specify the mode argument for File.open(), the default is 'r', which stands for read. And to read a file, it has to exist already. The error message is telling you that there is no file named 'ex15.txt' in the current directory for ruby to read.
To get rid of the error, create a file called ex15.txt in the current directory, and type 'hello world' in the file.
When trying to delete a directory (+ contents) and after reading the files inside, FileUtils.rm_rf(path) will not delete all the folders, although it does delete all the files and some of the folders.
After some experimentation it seems to be related to a File.open block. (I actually do a regex match inside the block, but I'm just using a puts here to keep things clear)
File.open(file).each do |line|
puts line
end
From what I've read, the above should automatically close the file but when using this, FileUtils fails to complete its task.
However, if I use the following code, FileUtils works as desired.
open_file = File.open(file)
open_file.each do |line|
puts line
end
open_file.close
It's no big deal to use the code in the second example, but I do prefer the cleanliness of the first.
Is there any reason why that first example breaks FileUtils?
P.S. I'm new to both Ruby and Stack Overflow....Hi. My system is Ubuntu 11.04 (64bit), running RVM with Ruby 1.9.2-p180
You should use something like this:
File.open(file) do |f|
f.each{|line| puts line}
end
In your example the block is supplied to the each method and the version of open without a block is executed returning an IO object on which the each method is called.