如何通过Python Subprocess捕获2PDF转换的进度信息

使用Python subprocess调用fcoder 2PDF命令行工具时，成功捕获了大部分输出内容，但无法获取到显示转换进度的实时更新行信息，需解决该标准输出捕获问题。

现有调用代码 #

import subprocess

# Define the command to run
command = [r"C:\Program Files (x86)\2PDF\2PDF.exe","-src", r"C:\Users\Rajkumar\Desktop\a\a2.docx" ,"-dst", r"C:\Users\Rajkumar\Desktop" ,"-options", "mswildc:no" ,"-pdf", "ocr:yes", "ocr_lang:English"]

# Use subprocess to run the command and capture the output
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)

# Read and print the output while the process is running
while True:
    output = process.stdout.readline()
    if output == '' and process.poll() is not None:
        break
    if output:
        print(output.strip())

当前捕获到的输出 #

2PDF, Version 2.0, (c) fCoder SIA 2022

---------------------------------------------------------------

Loading files list, please wait...

1 of 1. "C:\Users\Rajkumar\Desktop\a\a2.docx" -> Pdf
...........
Ok

All files converted successfully

期望捕获的进度信息 #

需要捕获的是实时更新的单行进度内容（类似通过回车符\r刷新的"Processing page X of Y"类进度行），这类进度信息目前未被现有代码捕获。

已验证的Python脚本进度捕获方案 #

已实现捕获Python子进程的单行刷新进度，具体代码如下：

demo7.py（模拟进度输出的子进程） #

import time
import sys
num=1
for i in range(11):
    text="#"*i+"."*(10-i)
    print(f"[{text}] {i*10}%",end="\r")
    time.sleep(0.5)

demo8.py（捕获进度的父进程） #

import subprocess,os
command=["python",r"E:\PythonDIR\PdfUtil\demo7.py"]
# Set PYTHONUNBUFFERED environment variable
env = os.environ.copy()
env['PYTHONUNBUFFERED'] = '1'
# Run demo7.py using subprocess with line buffering
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, 
                           universal_newlines=True, env=env)
# Continuously read and print the live output
while True:
    output=process.stdout.readline()
    if output == '' and process.poll() is not None:
        break
    print(output ,end='')

该方案能正常捕获Python子进程的实时刷新进度，但针对2PDF这类外部exe无效，希望通过Windows核心API（如ctypes模块）解决该问题。

内容的提问来源于stack exchange，提问作者Raj1234