python实现在windows服务中新建进程的方法

#!python
import win32serviceutil 
import win32service 
import win32event
import os 
from subprocess import Popen, PIPE
import json
import signal
run_proc = None
class DMA_WS(win32serviceutil.ServiceFramework): 
 _svc_name_ = "DMA_WS"
 _svc_display_name_ = "DMA_WS"
 def __init__(self, args): 
  win32serviceutil.ServiceFramework.__init__(self, args) 
  self.hWaitStop = win32event.CreateEvent(None, 0, 0, None) 
 def SvcStop(self):   
  self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING) 
  win32event.SetEvent(self.hWaitStop) 
 def SvcDoRun(self):
  f = file('C:/DXMonitorSystem/dma.conf')
  host = json.load(f)
  f.close()
  dxsrv = os.path.join(host['app_path'], 'DXHttpServer.py')
  run_proc = Popen([host['ironpython'], dxsrv],
      stdin=PIPE, stdout=PIPE, stderr=PIPE, shell=False,
      cwd=host['app_path'])
      #这里新建进程，注意cwd参数必不可少且要是绝对路径
  #res, err = run_proc.communicate()
  #这个函数内的上面部分都是逻辑处理的部分，可以根据自己的需求订制，但下面这行代码任何服务都需要
  win32event.WaitForSingleObject(self.hWaitStop, win32event.INFINITE) 
  run_proc.kill() # 用于关闭服务所创建的子进程
  #os.kill(run_proc.pid, signal.SIGTERM)
if __name__=='__main__':
 win32serviceutil.HandleCommandLine(DMA_WS)