Ruby equivalent for python array

Question

I need a ruby equivalent for the following python code

import array
my_array = array.array('B', [0x00, 0x04, 0xcc, 0x50]).tostring()

UPDATE: I am trying to write 4 bytes to the serial port using ruby-serialport gem.

I was able to make it work in python by writing the above byte array to the serial port. Now I am trying to do the same in ruby.

What is it supposed to do? Did you try ['B', [0x00, 0x04, 0xcc, 0x50]].to_s? — Wukerplank
– Wukerplank, Commented Jul 18, 2011 at 6:36
You really need to beef up the question or else nobody will be able to help you. — Wukerplank
– Wukerplank, Commented Jul 18, 2011 at 6:42

mu is too short · Accepted Answer · 2011-07-18 06:45:02Z

6

Are you looking for Array#pack?

byte_string = [0x00, 0x04, 0xCC, 0x50].pack('C*')

From the fine manual:

arr.pack ( aTemplateString ) → aBinaryString
Packs the contents of arr into a binary sequence according to the directives in aTemplateString.

The C template is for unsigned eight bit integers (i.e. single bytes) and the * just means "use the preceding template for the rest of the elements in the array".

answered Jul 18, 2011 at 6:45

mu is too short

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3 Comments

Billy Samuel Over a year ago

Thanks mu, It helped me solved the issue. I have green signal and have given an upvote

mu is too short Over a year ago

@Billy: The reverse is String#unpack in case you need to read some bytes from the port and turn them into useful numbers and the like.

Billy Samuel Over a year ago

Hi mu, thanks again... The above comment helped me to read the data from the port.

qoyllur · Accepted Answer · 2011-07-18 06:49:09Z

1

Seems like you want to get the following string: \x00\x04\xccP. You can simply write "\x00\x04\xcc\x50"

answered Jul 18, 2011 at 6:49

qoyllur

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Comments

Tugrul Ates · Accepted Answer · 2011-07-18 07:03:37Z

1

You can put bytes, which are given in hexadecimal, directly into your string. Below piece is valid for both Python and Ruby.

"\x00\x04\xcc\x50"

edited Jul 18, 2011 at 7:03

answered Jul 18, 2011 at 6:47

Tugrul Ates

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