Ruby File#sysread

ruby-talk
1

I am attempting to create a program that can transfer files. It so far
can send pure-text files no problem, but it has issues with reading
anything else. EG. It cut a 6 MB mp3 down to a 6 kb file.

After a bit of fiddling around I found that the program wasn't reading
the file properly. I'm currently using File#sysread to read the file and
File#syswrite to write the file. I don't know why it wont read the whole
file, can some body please help. Here is a copy of a similar program
with the same problem. (please dont mock it uselessness, it was made to
try and sort aforementioned problem).

f1 = File.new("BIG.txt")
f2 = File.new("big.txt", "w")

contents = f1.sysread(f1.stat.size-2)

print f1.stat.size.to_s + "\n"
print contents.length.to_s + "\n"

f2.syswrite contents

print f2.stat.size.to_s + "\n"

sleep 2

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2

Aatch wrote:

I am attempting to create a program that can transfer files. It so far
can send pure-text files no problem, but it has issues with reading
anything else. EG. It cut a 6 MB mp3 down to a 6 kb file.
  
On Windows? "rb"

···

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3

Tim Hunter wrote:

Aatch wrote:

I am attempting to create a program that can transfer files. It so far
can send pure-text files no problem, but it has issues with reading
anything else. EG. It cut a 6 MB mp3 down to a 6 kb file.
  
On Windows? "rb"

<.< >.> yes. I have no other choice. But yes, I was thinking it might be
windows fault

···

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4

Tim Hunter wrote:

Aatch wrote:

I am attempting to create a program that can transfer files. It so far
can send pure-text files no problem, but it has issues with reading
anything else. EG. It cut a 6 MB mp3 down to a 6 kb file.
  
On Windows? "rb"

<.< >.> yes. I have no other choice. But yes, I was thinking it might be windows fault

Just in case the answer wasn't clear, Windows pretends that "text" files
are different from "binary" files.

So you'll want to use "binary mode" to read/write binary files on Windows.

Thus, use "rb" instead of "r" to read a binary file, and "wb" instead of "w"
to write a binary file.

Hope this helps,

Bill

···

From: "James Milner" <bladeon@gmail.com>

5

Bill Kelly wrote:

From: "James Milner" <bladeon@gmail.com>

windows fault

Just in case the answer wasn't clear, Windows pretends that "text" files
are different from "binary" files.

So you'll want to use "binary mode" to read/write binary files on
Windows.

Thus, use "rb" instead of "r" to read a binary file, and "wb" instead of
"w"
to write a binary file.

Hope this helps,

Bill

Ahh, thanks. I've had little experience with the File class in ruby.
I'll test it now. It should ::prays:: work.

···

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6

Hi,

At Fri, 15 Jun 2007 13:09:49 +0900,
Aatch Random wrote in [ruby-talk:255684]:

I'll test it now. It should ::prays:: work.

It's an eternal curse against Windows programers. :slight_smile:

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Nobu Nakada