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我使用 Pywin32 工具和 NSSM 为我的 Flask 应用程序创建了一个 Windows 服务。我注意到该服务不会开始给我消息：

The service did not return an error. This could be an internal Windows error or an internal service error

我注意到，当我删除对 config.json 文件（用于连接到数据库）的所有引用时，创建的服务就会启动。我的 service.py 是：

import win32serviceutil
import win32service
import win32event
import servicemanager
from multiprocessing import Process

from app import app


class Service(win32serviceutil.ServiceFramework):
    _svc_name_ = "TestService"
    _svc_display_name_ = "Test Service"
    _svc_description_ = "Tests Python service framework by receiving and echoing messages over a named pipe"

    def __init__(self, *args):
        super().__init__(*args)

    def SvcStop(self):
        self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
        self.process.terminate()
        self.ReportServiceStatus(win32service.SERVICE_STOPPED)

    def SvcDoRun(self):
        self.process = Process(target=self.main)
        self.process.start()
        self.process.run()

    def main(self):
        app.run()


if __name__ == '__main__':
    if len(sys.argv) == 1:
        servicemanager.Initialize()
        servicemanager.PrepareToHostSingle(RouterService)
        servicemanager.StartServiceCtrlDispatcher()
    else:
        win32serviceutil.HandleCommandLine(RouterService)

app.py 的以下示例实现有效：

from flask import Flask
import json
import socket

app = Flask(__name__)


host = "<IP>"
user = "<username>"
passwd = "XXXXX"
DB = "YYYYY"

@app.route('/')
def hello_world():
    return 'Hello, World!'

app.run(host = "0.0.0.0",debug = False, port=9000, threaded=True)

但是，只要我添加代码以从 config.json 文件读取数据库凭据，创建的服务就会给我一个错误：

conf = open('.\\config.json', "r")
data = json.loads(conf.read())
db_conf = data['db_connection']

host = db_conf['host']
user = db_conf['username']
passwd = db_conf['password']
DB = db_conf['DB']

pywin32读取json文件有什么问题吗？当我从命令提示符运行相同的 app.py 文件时，它会读取所有 json 文件并运行没有问题。

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