Davinci Resolve子进程检测代码问题排查与优化咨询

一、DaVinci Resolve启动进程流程 #

• 启动DaVinci Resolve时，加载阶段会启动名为Resolve的子进程
  
• 加载完成后，Resolve子进程关闭，同时启动名为Project Manager的子进程
  

二、现有代码的问题 #

你提供的代码存在以下明确错误：

• 函数未定义：遍历进程的逻辑没有封装成is_process_running函数，后续调用时会触发NameError
• 变量未定义：遍历逻辑中用到的process_name没有传入或定义
• 引号格式错误：代码中使用了中文引号（“”），Python仅支持英文引号（""），会引发语法错误
• 冗余导入：导入了subprocess但未实际使用，属于无效代码

修正后的基础可用代码：

import time
import psutil

def is_process_running(process_name):
    for proc in psutil.process_iter(['pid', 'name']):
        try:
            if proc.info['name'] == process_name:
                return True
        except (psutil.NoSuchProcess, psutil.AccessDenied):
            # 忽略已结束或无权限访问的进程
            continue
    return False

print("Waiting for the 'Project Manager' sub-process")
while not is_process_running("Project Manager.exe"):
    time.sleep(1)

print("Subprocess 'Project Manager' is open")

三、Windows内置命令替代方案 #

不需要依赖psutil，可以通过Windows自带的tasklist命令结合subprocess实现进程检测：

import subprocess
import time

def is_process_running(process_name):
    result = subprocess.run(
        ['tasklist', '/fi', f'IMAGENAME eq {process_name}'],
        capture_output=True,
        text=True
    )
    # 排除空结果的情况，确认进程存在
    return process_name in result.stdout and 'INFO: No tasks are running' not in result.stdout

print("Waiting for the 'Project Manager' sub-process")
while not is_process_running("Project Manager.exe"):
    time.sleep(1)

print("Subprocess 'Project Manager' is open")

四、更高效可靠的检测方式 #

time.sleep(1)轮询属于被动等待，效率较低，推荐两种更优方案：

1. 实时监听进程创建事件（Windows API） #

通过pywin32调用Windows WMI接口，实时监听新进程创建事件，无需轮询：

import win32com.client
import pythoncom

def wait_for_process(process_name):
    pythoncom.CoInitialize()
    wmi = win32com.client.GetObject("winmgmts:")
    # 设置0.1秒的监听间隔，接近实时触发
    watcher = wmi.ExecNotificationQuery(
        "SELECT * FROM __InstanceCreationEvent WITHIN 0.1 WHERE TargetInstance ISA 'Win32_Process'"
    )
    while True:
        event = watcher.NextEvent()
        if event.TargetInstance.Name == process_name:
            print(f"Subprocess '{process_name}' is open")
            break

wait_for_process("Project Manager.exe")

这种方式无轮询延迟，是效率最高的检测方式。

2. 关联父进程检测 #

由于Project Manager是DaVinci Resolve的子进程，可以先定位主Resolve进程，再监听其子进程创建，避免误判其他同名进程：

import psutil
import time

def get_main_resolve_pid():
    for proc in psutil.process_iter(['pid', 'name']):
        if proc.info['name'] == "Resolve.exe":
            return proc.info['pid']
    return None

def wait_for_child_process(parent_pid, child_name):
    while True:
        try:
            parent = psutil.Process(parent_pid)
            for child in parent.children(recursive=True):
                if child.name() == child_name:
                    print(f"Subprocess '{child_name}' is open")
                    return
        except psutil.NoSuchProcess:
            print("Main Resolve process exited before Project Manager started")
            return
        time.sleep(0.5)

main_pid = get_main_resolve_pid()
if main_pid:
    wait_for_child_process(main_pid, "Project Manager.exe")
else:
    print("Main Resolve process not found")

这种方式准确性更高，不会混淆系统中的其他同名进程。

内容的提问来源于stack exchange，提问作者Phill