Extracting output from .exe in real-time and storing it

Question

I have a .exe programme that produces real-time data. I want to extract the output when running the programme in real-time, however It's my first time trying this out, and so I wanted help in approaching this.

I have opened it with the following:

cmd = r'/Applications/StockSpy Realtime Stocks Quote.app/Contents/MacOS/StockSpy Realtime Stocks Quote'

import subprocess

with open('output.txt', 'wb') as f:
    subprocess.check_call(cmd, stdout=f)

# to read line by line
with open('output.txt') as f:
    for line in f:
        print(line)
# output = qx(cmd)

with the aim to store the output. However, it does not save any of the output, I get a blank textfile.

I managed to save the output by following this code:

from subprocess import STDOUT, check_call as x

with open(os.devnull, 'rb') as DEVNULL, open('output.txt', 'wb') as f:
    x(cmd, stdin=DEVNULL, stdout=f, stderr=STDOUT)

from How do I get all of the output from my .exe using subprocess and Popen?

Answer 1

What you are trying to do can be achieved with python using something like this:

import subprocess
with subprocess.Popen(['/path/to/executable'], stdout=subprocess.PIPE) as proc:
    data = proc.stdout.read()   # the data variable will contain the 
                                # what would usually be the output 
    """Do something with data..."""