# File: testwrapper.py
# Date: 2-19-2017
# Description: A python test program that program that prints output from a subprocess.

import subprocess
import time

def main():
    launch_executable()
    
def launch_executable():
    """ Launches the command-line program """
    
    print("Launch started")
    program_name = "top"    # this can be any command that continually prints output
    list = [program_name]
    process = subprocess.Popen(list, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    while process.poll() == None:
        print("subprocess still running")
        print("Value = " + process.stdout.readline())
        time.sleep(0.1)
        
    print("Exit")
    
if __name__ == "__main__":
    main()