Linux中Python父进程与C子进程之间的通信

Question

I am developing a Python application that needs to spawn a child process (written in C) from time to time, to feed it some binary data and to get a reply. The child process will only be spawned when needed and will only serve one request. What are my options here? Is it safe to use stdin/stdout?

Answer 1

from subprocess import Popen,PIPE

# Example with output only
p = Popen(["echo", "This is a test"], stdout=PIPE)
out, err = p.communicate()
print out.rstrip()

# Example with input and output
p = Popen("./TestProgram", stdin=PIPE, stdout=PIPE)
out, err = p.communicate("This is the input\n")
print out.rstrip()

The program TestProgram reads one line from stdin and writes it to stdout . I have added the .rstrip() to the output to remove trailing new line characters, for your binary data you probably will not want to do this.