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目录

WxPython界面用pubsub实现多线程控制

用WxPython做界面时， 如果数据操作时间比较长，会使 WxPython 界面处于假死状态，用户体验非常不好。

WxPython是利用pubsub来完成消息的传送。

下面提供一个 WxPython界面利用pubsub 实现2个线程的控制的例子

实际使用， 只要修改WorkThread1、WorkThread2 里的 run 内容 及 MainFrame 里的 updateDisplay 内容即可。

在此基础上，可以实现多线程。

Python 3.7.3
wxPython          4.0.6
Pypubsub          4.0.3

在此之前有个单线程及进度条的例子，简单需求可以参考这个

下面提供本文的代码

# encoding: utf-8
"""
@author: 陈年椰子
@contact: hndm@qq.com
@version: 1.0
@project:test 
@file: wx_thread.py
@time: 2022-3-24 15:34
说明
"""
 
import wx
from pubsub import pub
from time import sleep
import time
import threading
import sys
from random import random
 
 
# 线程调用耗时长代码
class WorkThread1(threading.Thread):
    def __init__(self):
        """Init Worker Thread Class."""
        threading.Thread.__init__(self)
        self.breakflag = False
        self.start()
 
    def stop(self):
        self.breakflag = True
 
    # 耗时长的代码
    def workproc(self):
        while True:
            if self.breakflag:
                pub.sendMessage("update", mstatus="查询Thread中断")
                sleep(2)
                break
            ts1 = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time()))
            t_sum = "查询的结果"
            # print(ts1,t_sum)
            #  此处加的数据库代码
            pub.sendMessage("update", mstatus="{}:查询最后10个数据并汇总{}".format(ts1, t_sum))
            sleep(10)
        pub.sendMessage("update", mstatus="workdone")
        return ""
 
    def run(self):
        """Run Worker Thread."""
        pub.sendMessage("update", mstatus="workstart")
        self.workproc()
 
 
 
 
# 线程调用耗时长代码
class WorkThread2(threading.Thread):
    def __init__(self):
        """Init Worker Thread Class."""
        threading.Thread.__init__(self)
        self.breakflag = False
        self.start()
 
    def stop(self):
        self.breakflag = True
 
    # 耗时长的代码
    def workproc(self):
        while True:
            if self.breakflag:
                pub.sendMessage("update", mstatus="随机数Thread中断")
                sleep(2)
                break
            ts1 = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time()))
            t_info = "随机数{}".format(str(random()))
            # print(ts1, t_info)
            #  此处加的数据库代码
            pub.sendMessage("update", mstatus="{}:产生{}".format(ts1, t_info))
            sleep(1)
        pub.sendMessage("update", mstatus="workdone")
        return ""
 
    def run(self):
        """Run Worker Thread."""
        pub.sendMessage("update", mstatus="workstart")
        self.workproc()
 
 
 
class MainFrame(wx.Frame):
    """
    简单的界面
    """
 
    def __init__(self, *args, **kw):
        # ensure the parent"s __init__ is called
        super(MainFrame, self).__init__(*args, **kw)
        self.SetSize(size=(600, 400))
 
        # create a panel in the frame
        pnl = wx.Panel(self)
 
        # and put some text with a larger bold font on it
        self.st = wx.StaticText(pnl, label="分析工具 V 2022", pos=(25, 25))
        self.st2 = wx.StaticText(pnl, label="提示", pos=(25, 80))
        font = self.st.GetFont()
        font.PointSize += 2
        font = font.Bold()
 
        self.st.SetFont(font)
        self.st2.SetFont(font)
 
        # create a menu bar
        self.makeMenuBar()
 
        self.gauge = wx.Gauge(self, range=100, size=(500, 20))
        self.gauge.SetBezelFace(3)
        self.gauge.SetShadowWidth(3)
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.st, 0, wx.BOTTOM | wx.ALIGN_CENTER_VERTICAL, 0)
        sizer.Add(self.st2, 0, wx.BOTTOM | wx.ALIGN_CENTER_VERTICAL, 0)
        sizer.Add(self.gauge, 0, wx.BOTTOM | wx.ALIGN_CENTER_VERTICAL, 0)
 
        self.SetSizer(sizer)
 
        # and a status bar
        self.CreateStatusBar()
        self.SetStatusText("启动完成!")
 
        pub.subscribe(self.updateDisplay, "update")
 
    def makeMenuBar(self):
        """
        A menu bar is composed of menus, which are composed of menu items.
        This method builds a set of menus and binds handlers to be called
        when the menu item is selected.
        """
 
        # Make a file menu with Hello and Exit items
        fileMenu = wx.Menu()
        # The "\t..." syntax defines an accelerator key that also triggers
        # the same event
        # helloItem = fileMenu.Append(-1, "&Hello...\tCtrl-H",
        #         "Help string shown in status bar for this menu item")
        self.startItem = fileMenu.Append(-1, "开始",
                                         "开始工作")
        self.stopItem = fileMenu.Append(-1, "停止",
                                        "中断工作")
        fileMenu.AppendSeparator()
        self.exitItem = fileMenu.Append(-1, "退出",
                                        "退出")
 
        # Now a help menu for the about item
        helpMenu = wx.Menu()
        aboutItem = helpMenu.Append(-1, "关于",
                                    "WxPython 界面与线程通讯的例子")
 
        # Make the menu bar and add the two menus to it. The "&" defines
        # that the next letter is the "mnemonic" for the menu item. On the
        # platforms that support it those letters are underlined and can be
        # triggered from the keyboard.
        self.menuBar = wx.MenuBar()
        self.menuBar.Append(fileMenu, "工作")
        self.menuBar.Append(helpMenu, "信息")
 
        # Give the menu bar to the frame
        self.SetMenuBar(self.menuBar)
        self.stopItem.Enable(False)
 
        self.count = 0
 
        # Finally, associate a handler function with the EVT_MENU event for
        # each of the menu items. That means that when that menu item is
        # activated then the associated handler functin will be called.
        self.Bind(wx.EVT_MENU, self.OnStart, self.startItem)
        self.Bind(wx.EVT_MENU, self.OnStop, self.stopItem)
        self.Bind(wx.EVT_MENU, self.OnExit, self.exitItem)
        self.Bind(wx.EVT_MENU, self.OnAbout, aboutItem)
 
    def OnExit(self, event):
        """Close the frame, terminating the application."""
        try:
            self.work1.stop()
            self.work2.stop()
            sleep(2)
        except:
            pass
        self.Close(True)
        sys.exit()
 
    def OnStart(self, event):
        self.work1 = WorkThread1()
        self.work2 = WorkThread2()
 
    def OnStop(self, event):
        self.work1.stop()
        self.work2.stop()
 
    def OnAbout(self, event):
        """Display an About Dialog"""
        wx.MessageBox("分析工具 v2019",
                      "关于",
                      wx.OK | wx.ICON_INFORMATION)
 
    def updateDisplay(self, mstatus):
        """
        Receives data from thread and updates the display
        """
        # print("pub display", mstatus)
        if mstatus.find("workstart") >= 0:
            self.SetStatusText("开始工作，代码不提供中断线程语句，请等待！")
            self.startItem.Enable(False)
            self.stopItem.Enable(True)
            self.exitItem.Enable(False)
        if mstatus.find("workdone") >= 0:
            self.SetStatusText("完成！")
            self.stopItem.Enable(False)
            self.startItem.Enable(True)
            self.exitItem.Enable(True)
        else:
            if mstatus.find("查询")>=0:
                self.st.SetLabel(mstatus)
            else:
                self.st2.SetLabel(mstatus)
            # if mstatus.find(",") > 0 and mstatus.find("计算") >= 0:
            #     mdata = mstatus.split(",")
            #     # 示范 ， 实际使用需要传送进度
            #     # print(int(mdata[0].replace("计算","")))
            #     g_count = int(mdata[0].replace("计算", ""))
            #     self.gauge.SetValue(g_count)
 
 
def test():
    app = wx.App()
    frm = MainFrame(None, title="分析工具")
    frm.Show()
    app.MainLoop()
 
 
if __name__ == "__main__":
    test()

运行后， 点击 工作-开始。 2个线程开始工作，直到点击工作-结束

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。

关键词： 开始工作 多线程控制 假死状态 使用需要 操作时间