在Python上运行背景循环

Question

我正在尝试创建一个Python串口侦听器应用程序。

我的问题是在后台运行监听器功能而不会杀死GUI。

这是代码：

import sys
import getopt
import serial
from time import sleep
from threading import *
from Tkinter import *
import io
#ser = serial.serial_for_url('loop://', timeout=1)
#sio = io.TextIOWrapper(io.BufferedRWPair(ser, ser))

runing = True
ser = None
class App:
  global ser
  def __init__(self, master):
    varCOM = StringVar(master)
    varCOM.set("COM1")
    listbox = OptionMenu(master, varCOM, "COM1", "COM2", "COM3", "COM4")
    listbox.grid(row=0, column=0)

    varBaudRate = StringVar(master)
    varBaudRate.set(4800)
    listboxBaudrate = OptionMenu(master, varBaudRate, 300, 1200, 2400, 4800, 9600, 14400, 19200, 38400)
    listboxBaudrate.grid(row=0, column=1) 

    varParity = StringVar(master)
    varParity.set("None")
    listboxParity = OptionMenu(master, varParity, "None", "Even", "ODD", "Mark", "Space")
    listboxParity.grid(row=1, column=0)

    varDataBits = StringVar(master)
    varDataBits.set(8)
    listboxDataBits = OptionMenu(master, varDataBits, 5, 6, 7, 8)
    listboxDataBits.grid(row=1, column=1)

    varStopBits = StringVar(master)
    varStopBits.set(2)
    listboxStopBits = OptionMenu(master, varStopBits, 1, 2)
    listboxStopBits.grid(row=2, column=0)

  def detener():
    global runing
    runing = False
    detencion = Thread(target=detener)

  def detencionRun():
    detencion.run()

  def write():
    while runing == True:
      #sleep(10)
      line = ser.read(14)
      if line:
        print line
        file.write(line)
    itinerancia = Thread(target=write)

  def openPort(port='COM1', baudrate=1920, bytesize=8, parity='N', stopbits=1):
    try:
      global ser
      global file
      port = varCOM.get()
      baudrate = int(varBaudRate.get())
      bytesize = int(varDataBits.get())
      stopbits = int(varStopBits.get()) 
      ser = serial.Serial(port=port, baudrate=baudrate, bytesize=bytesize, parity=parity, stopbits=stopbits)
      file = open("lecture.txt", "a")
      file.write("-- INICIO PROGRAMA --\n")

      itinerancia.run()
      #while runing == True:
      #  line = ser.read(14)
      #  if line:
      #    print line
      #    file.write(line)
      file.write("\n-- FIN DEL PROGRAMA --\n")
      file.close()
    except serial.SerialException:
        print 'No se pudo abrir el puerto'
    return

  def ejecutar():
    detener = Button(master, text="Detener", command=detencionRun)
    detener.grid(row=3, column=0)

    t = Thread(target=openPort)
    t.run()

    ejecutar = Button(master, text="Ejecutar", command=ejecutar)
    ejecutar.grid(row=3, column=1)


if __name__ == '__main__':
  root = Tk()
  app = App(root)
  root.mainloop()

应用程序在while循环中冻结。 抱歉我的英文和编码不好（我是Python的新手）

Answer 1

您可以尝试多线程化您的应用程序并将轮询和文件写入其他线程，或者您可以尝试将端口读取和文件写入更大的程序循环中的较小块，以便处理大块数据不会完全阻止程序的执行。 请记住，如果您尝试将其包装出去，您可能希望使用读写缓冲区进行设置，以便在完全编写或处理之前不会意外地转储或覆盖内存中的数据。它。