I'm writing a script in Python that should communicate with a software "ConsoleApplication.exe"(wrote in C); this last one once started waits for a fixed lenght command(5 bytes) from his "stdin" and generates (after 2-3 seconds) on his "stdout" an output that I should read on my Python script.
#//This is the "ConsoleApplication.c" file
#include <stdio.h>
#include <function.h>
char* command[5];
int main()
{
while(1)
{
scanf("%s\n", &command);
output = function(command);
print("%s\n", output);
}
}
#this is Python code
import subprocess
#start the process
p = subprocess.Popen(['ConsoleApplication.exe'], shell=True, stderr=subprocess.PIPE)
#command to send to ConsoleApplication.exe
command_to_send = "000648"
#this seems to work well but I need to send a command stored into a buffer and if Itry
#to use sys.stdout.write(command_to_send)nothing will happen. The problem seem that
#sys.stdout.write expect an object I/O FILE
while True:
out = p.stderr.read(1)
if out == '' and p.poll() != None:
break
if out != '':
sys.stdout.write(out)
sys.stdout.flush()
Any suggestions? How can I fix it?
I tried to use
stdout = p.communicate(input='test\n')[0]
but Im getting the following error at runtime: "TypeError: 'str' does not support the buffer interface" I also tried this
from subprocess import Popen, PIPE, STDOUT
p = Popen(['ConsoleApplication.exe'], stdout=PIPE, stdin=PIPE, stderr=PIPE)
out, err = p.communicate(input='00056\n'.encode())
print(out)
out, err = p.communicate(input='00043\n'.encode())
print(out)
but I get this error: "ValueError: Cannot send input after starting communication"
