binary data

[Alwin Blok]

Hello!

I'm new to ruby. I'm learning it and it seems to be a very nice
language.

However, I do have a question about binary handling. I'd like to write
binary data directly to a file.
I found that I can use myfile.write(["1001010100"].pack("B10")), but
i'd like to be able to write, for example 0b1001010100 directly to a
file. How do I do that, or else, are ther other useful ways to write
binary data to a file

Thanks in advance

Alwin

 

[Alwin Blok]

Is my question to hard or to easy to answer? Can someone please
comment? I'm playing with ruby + fbdev on my laptop so I can make
mandelbrots everywhere I go!

Thanks,
Alwin

 

[Jamis Buck]

However, I do have a question about binary handling. I'd like to
write binary data directly to a file.
I found that I can use myfile.write(["1001010100"].pack("B10")), but
i'd like to be able to write, for example 0b1001010100 directly to a
file. How do I do that, or else, are ther other useful ways to write
binary data to a file?

I'd be interested in an answer to this one, too, from someone who is "in
the know." Whenever I've needed to write binary data in the past I've
had to pack it into a string first... shouldn't there be a routine
somewhere that will write a value directly without first converting it
to a string?

Yes, I know it isn't hard to create a method that will take a value and
convert it to a binary string representation, but I'm wondering if there
is already a solution to this in the existing Ruby libraries.

- Jamis

 

[Dave Wilson]

However, I do have a question about binary handling. I'd like to write
binary data directly to a file.
I found that I can use myfile.write(["1001010100"].pack("B10")), but
i'd like to be able to write, for example 0b1001010100 directly to a
file. How do I do that, or else, are ther other useful ways to write
binary data to a file?

I don't know of a more appropriate method, but what about

class IO
def raw_write bits
bits = [bits.to_s].pack('B*') if bits.is_a? Fixnum
write bits
end
end

myfile.raw_write 0b1001010100

Dave

 

[quillion]

Hello!

I'm new to ruby. I'm learning it and it seems to be a very nice language.

However, I do have a question about binary handling. I'd like to write
binary data directly to a file.
I found that I can use myfile.write(["1001010100"].pack("B10")), but i'd
like to be able to write, for example 0b1001010100 directly to a file.
How do I do that, or else, are ther other useful ways to write binary
data to a file

Thanks in advance

Alwin

very old coding style, may be of interest

begin
out_file = your data
f = File.new("file name", "w")
end

begin
out_file.each{ |ch|
f.binmode.putc(ch)
}
ensure
f.close
end



neil

 

[daz]

Hello!

I'm new to ruby. I'm learning it and it seems to be a very nice language.

However, I do have a question about binary handling. I'd like to write
binary data directly to a file.
I found that I can use myfile.write(["1001010100"].pack("B10")), but i'd
like to be able to write, for example 0b1001010100 directly to a file.
How do I do that, or else, are ther other useful ways to write binary
data to a file

Thanks in advance

Alwin

very old coding style, may be of interest

begin
out_file = your data
f = File.new("file name", "w")
end

begin
out_file.each{ |ch|
f.binmode.putc(ch)
}
ensure
f.close
end



neil

Like Neil said ...


File.open('tbinary.dat', 'wb') do |fb|
fb.putc 0b11011011
fb.putc 255
fb.putc 0xAB
fb.putc 0x42
end

## See what happened ...
File.open('tbinary.dat', 'rb') do |fb|
bd = fb.read
puts bd.unpack('H*')
end


#-> dbffab42


daz