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.

Answer 1

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”.