Making a file?

[Ulqiorra]

I found a strange error with File.open (which can be used to make files that don't exist)
where i used the filename 'File.gtdata', and got:

No such file or directory "File.gtdata"

Is there a method to make files without opening them?

 

[Ellie]

I'm not sure but I'd suggest what can be useful is something like:

p File.methods

As if you think a method might exist but don't know what it's called that can help.

 

[Ulqiorra]

i did that, but i didn't see anything that looked like it would make a file.

 

[Glitchfinder]

actually, you didn't include the full set of methods. In this case, you want to tell it your are opening a file to write data to it. So, you would use the following code:

file = File.open("File.gtdata", "wb")

Now, the "wb" stands for "write binary". There are other strings you can use, like "r" or "rb", which both amount to "read binary", as well as seperate versions for text files. If I remember correctly, they are the same as if you were writing in C/C++, so if you must, go ahead and look it up.

Also, a quote from the help file on the open command:

open(file[, mode]) {|io| ... }

Opens file and returns a File object. mode specifies one of the following strings. When mode is omitted, the default is "r".

• "r": Opens file in read mode.
• "w": Opens file in write mode. If a file already exists when file is opened, the previous file's contents will be deleted.
• "a": Opens file in write mode. Output will always be appended to the end of the file.

Using "+" opens the file in read-write mode (RDWR):

• "r+": Sets the read-write position to the beginning of the file.
• "w+": The same as "r+", but if a file already exists when file is opened, the previous file's contents will be deleted.
• "a+": The same as "r+", but if a file already exists when file is opened, the read-write position will be set to the end of the file.

The "b" flag can also be added to any of these (in the format "r+b") to open the file in binary mode.

When open is called along with a block, it opens the file, executes the block, then closes the file when execution is complete. In this case, returns the result of the block evaluation. That is:

open(path, mode) do |f|

   ...

end

 

# almost identical to the above

f = open(path, mode)

begin

   ...

ensure

  f.close

end

You know, it's amazing how helpful the RMXP help file is when compared to most programs. I mean, it not only tells you how to use the basic program, but how to do a lot of stuff in Ruby and RGSS.

 

[Ulqiorra]

Oh, I actually did have the "wb" in the method, sorry.

And also, for opening txt/rb/rxdata files to read, i've always used 'r+', is that any different from 'r' or 'rb'?