多线程是在 pysimplegui 脚本中跟踪传递时间的唯一方法吗？

如何解决多线程是在 pysimplegui 脚本中跟踪传递时间的唯一方法吗？

所以，我正在编写一个需要检查经过时间并以特定时间间隔执行某些操作的脚本。看起来 pysimplegui main_loop 结构完全是事件驱动的，所以我不能只向 while 循环添加经过时间检查。我之前做过一次多线程，但我不太理解，我想尽可能简单。

#!/usr/bin/python3

import PySimpleGUI as sg
import os.path
from datetime import datetime
import csv

csvName = ''
currentTime = datetime.Now()
fileStartTime = datetime.Now()
workingVideoFile = ''
recordingFlag = False

def mainLoop():
    global recordingFlag
    global csvName
    global currentTime
    global fileStartTime
    global workingVideoFile

    while True:
        event,values = window.read()
        if event == "Exit" or event == sg.WIN_CLOSED:
            break
        
        if event == "-FOLDER-":
            folder = values["-FOLDER-"]
            try:
                csvSetup(str(folder))
                window.FindElement("Start Recording").Update(disabled=False)
                window.FindElement("Submit Log with Time Stamp").Update(disabled=False)
            except:
                print ('Trying to set destination folder')
                print (Exception)
        
        if event == "Start Recording":
            try:
                window.FindElement("Start Recording").Update(disabled=True)
                window.FindElement("Stop Recording").Update(disabled=False)
                fileStartTime = datetime.Now()
                # Sent Bash command or whatever
                recordingFlag = True
            except:
                print ('Trying to start recording')
                print (Exception)

        if event == "Stop Recording":
            try:
                window.FindElement("Start Recording").Update(disabled=False)
                window.FindElement("Stop Recording").Update(disabled=True)
                # Send bash command or whatever
                recordingFlag = False
            except:
                print ('Trying to stop recording')
                print (Exception)
        
        if event == "Submit Log with Time Stamp":

            log = values["logText"].replace('\n',' ')
            Now = datetime.Now().strftime("%m/%d/%Y %H:%M:%s")
            currentVideoName = "video 50:relative time" # get this
            logEntry = [Now,currentVideoName,log]

            try:
                with open(csvName,"a") as logFile:
                    logWriter = csv.writer(logFile,delimiter=',',quotechar='"',quoting=csv.QUOTE_MINIMAL)
                    logWriter.writerow(logEntry)

                window.FindElement("logText").Update('')
            except:
                print ('Trying to write CSV')
                print (Exception)

        if recordingFlag:
            print (datetime.Now()-fileStartTime)

        if recordingFlag and (datetime.Now() - fileStartTime).total_seconds() >= 5:
            print ('it has been an hour')

    window.close()

def windowSetup():

    global window
    global layout

    sg.theme('DarkBlue')

    firstColumn = [
        [
            sg.Text("Select Location to Save Video File:"),sg.In(size=(40,1),enable_events=True,key="-FOLDER-"),sg.Folderbrowse(),],[
            sg.Text("                         ")
        ],[
            sg.Multiline(size=(200,50),key='logText')
        ],[
            sg.Text ("                                                                                      "),sg.Button("Submit Log with Time Stamp",disabled=True),]

    secondColumn = [
        [
            sg.Button("Start Recording",[
            sg.Text("               ")
        ],[
            sg.Button("Stop Recording",]

    layout = [
        [
            sg.Column(firstColumn),sg.Column(secondColumn)
        
        ]
    ]

def csvSetup(dirr):
    global csvName

    Now = datetime.Now().strftime("%m-%d-%Y")
    csvName = dirr + "/" + Now + ".csv"
    
    if  not os.path.exists(csvName):
        try:
            with open(csvName,"w") as logFile:
                logWriter = csv.writer(logFile,quoting=csv.QUOTE_MINIMAL)
                logWriter.writerow(['TIMESTAMP','VIDEO TIMESTAMP','LOG'])
        except:
            print('In csvSetup Function')
            print(Exception)
    
windowSetup()
window = sg.Window("Video Recorder",layout)
mainLoop()

解决方法

我添加了一个超时时间

event,values = window.read()

文件为

event,values = window.read(timeout=500)

强制循环每半秒运行一次，这样我就可以将经过时间检查添加到循环的末尾

,

如果您想跟踪实际花费的时间并获得准确的时钟滴答，那么您需要根据 Python 报告的时间进行测量。否则，您的代码会随着时间的推移而漂移。

例如，如果发生按钮点击，那么您的 window.read() 将立即返回并且您的超时时间不会过去。

如果我知道确切的时间很重要，我会使用与此类似的代码来计算它。

import PySimpleGUI as sg
from time import time


def main():

    layout = [  [sg.Text('My Window')],[sg.Input(key='-IN-')],[sg.Text(size=(12,1),key='-OUT-')],[sg.Button('Go'),sg.Button('Exit')]  ]

    window = sg.Window('Window Title',layout)

    start_time = last_time = time()

    while True:
        event,values = window.read(timeout=1000)
        if event in (sg.WIN_CLOSED,'Exit'):
            break

        delta_from_last = time() - last_time
        elapsed_time = time()- start_time
        print(delta_from_last,elapsed_time)
        last_time = time()

    window.close()

if __name__ == '__main__':
    main()