Can't create a new file


#1

I have no idea what’s going on. I’ve read about a dozen forums about
creating a file but I still can’t seem to do it.

I’m running in Windows Vista.
In a folder called “RUBY” I have a ruby file called “filetest.rb”.
There are no restrictions on the “RUBY” directory.

In the ruby file there are only 3 lines:
myfile = File.new(“somefile.txt”, “r+”)
myfile.puts “Hello”
myfile.close

When I run “ruby filetest.rb” I get the following error:
filetest.rb:5:in initialize': No such file or directory - somefile.txt (Errno:: ENOENT) from filetest.rb:5:innew’
from filetest.rb:5

I know there is “no such file”, that’s why I’m creating it. scratches
head
. If I create the file manually then it works, but I can’t get it
to create the file from scratch. I passed no folder structure in the
arguments so I assume that it should try and create the file in the same
directory of the *.rb file. What am I missing?

Thanks.


#2

From: Nebs P. [mailto:removed_email_address@domain.invalid]

myfile = File.new(“somefile.txt”, “r+”)

myfile = File.new(“somefile.txt”, “w”)
^^^^^^^

myfile.puts “Hello”

myfile.close

try using the block form File.open since it opens and close for you, eg

create the file,

File.open(“somefile.txt”, “w”) do |f|
f.puts “Hello”
end
#=> nil

then read it back

File.open(“somefile.txt”, “r”) do |f|
puts f.gets
end
Hello
#=> nil


#3

Thanks, it works now. It had to do with opening for writing only. I
guess it makes sense that you can’t open a file for reading if it
doesn’t exist, I just thought that if you open for reading AND writing
it would be smart enough to create it anyways and just return nil on a
“gets” or similar request. Anyways, thanks again.


#4

2009/1/30 Nebs P. removed_email_address@domain.invalid:

Thanks, it works now. It had to do with opening for writing only. I
guess it makes sense that you can’t open a file for reading if it
doesn’t exist, I just thought that if you open for reading AND writing
it would be smart enough to create it anyways and just return nil on a
“gets” or similar request. Anyways, thanks again.

Well, you can do that but you need a different open mode: open for
writing /plus/ reading:

13:37:55 ~$ ls -l foo
ls: cannot access foo: No such file or directory
13:37:58 ~$ irb
Ruby version 1.8.7
irb(main):001:0> File.open(“foo”,“w+”) {|io|
io.puts(“test”);io.seek(0,IO::SEEK_SET); p io.read}
“test\n”
=> nil
irb(main):002:0> exit
13:38:10 ~$ ls -l foo
-rw-r–r-- 1 RKlemme Domain Users 5 Jan 30 13:38 foo
13:38:11 ~$

Kind regards

robert