进程间通信Python

Question

我正在用Python语言编写一个脚本，它应该与软件“ConsoleApplication.exe”(用C编写)进行通信；最后一个脚本启动后，等待来自他的"stdin“的固定长度的命令(5个字节)，并在他的"stdout”上生成( 2-3秒后)我应该在我的Python脚本上读取的输出。

//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()

有什么建议吗？我怎么才能修复它？

我试着用

stdout = p.communicate(input='test\n')[0] 

但我在运行时收到以下错误："TypeError：'str‘不支持buffer接口“我也尝试了一下

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)

但是我得到了这个错误："ValueError: Cannot send input after starting“

Answer 1

看起来这个问题有你的答案

Python - How do I pass a string into subprocess.Popen (using the stdin argument)?

使用Popen.communicate()方法