Ruby File#sysread

Ruby
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

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”

3

Tim H. 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

4

From: “James Milner” [email protected]

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

5

Hi,

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

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

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

6

Bill K. wrote:

From: “James Milner” [email protected]

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.