search
HomeBackend DevelopmentPython Tutorialwxpython中利用线程防止假死的实现方法

前段时间我编写了一个工业控制的软件,在使用中一直存在一个问题,就是当软件检索设备时,因为这个功能执行的时间比较长,导致GUI界面假死,让用户分辨不清楚软件到底仍在执行,还是真的挂掉了。(虽然我设计了同步log显示,但是这个也同样假死了)

程序截图如下:

代码解析如下:

# -*- coding: utf-8 -*-
 
import time
import wx
from threading import Thread
from wx.lib.pubsub import Publisher

time库用来执行定时函数,模拟需要长时间执行的功能。Publisher用来在线程间传输消息。

class TestThread(Thread):
 def __init__(self):
  #线程实例化时立即启动
  Thread.__init__(self)
  self.start()
 def run(self):
  #线程执行的代码
  for i in range(101):
   time.sleep(0.03)
   wx.CallAfter(Publisher().sendMessage, "update", i)
  time.sleep(0.5)
  wx.CallAfter(Publisher().sendMessage, "update", u"线程结束")


TestThread的__init__函数,定义线程实例化时就启动,run函数就是需要长时间执行的程序。
wx.CallAfter与Publisher().sendMessage用来向GUI发送消息。

class MyForm ( wx.Frame ):
 def __init__( self, parent ):
  wx.Frame.__init__ ( self, parent, id = wx.ID_ANY, title = u"Leniy,20140627", pos = wx.DefaultPosition, size = wx.Size( -1,-1 ), style = wx.DEFAULT_FRAME_STYLE|wx.TAB_TRAVERSAL )
  self.SetSizeHintsSz( wx.DefaultSize, wx.DefaultSize )
  gSizer2 = wx.GridSizer( 0, 3, 0, 0 )
  self.m_button2 = wx.Button( self, wx.ID_ANY, u"执行线程", wx.DefaultPosition, wx.DefaultSize, 0 )
  gSizer2.Add( self.m_button2, 0, wx.ALL|wx.ALIGN_CENTER_HORIZONTAL|wx.ALIGN_CENTER_VERTICAL, 5 )
  self.m_staticText2 = wx.StaticText( self, wx.ID_ANY, u"MyLabel", wx.DefaultPosition, wx.DefaultSize, 0 )
  self.m_staticText2.Wrap( -1 )
  gSizer2.Add( self.m_staticText2, 0, wx.ALL|wx.ALIGN_CENTER_HORIZONTAL|wx.ALIGN_CENTER_VERTICAL, 5 )
  self.m_gauge1 = wx.Gauge( self, wx.ID_ANY, 100, wx.DefaultPosition, wx.DefaultSize, wx.GA_HORIZONTAL )
  self.m_gauge1.SetValue( 0 ) 
  gSizer2.Add( self.m_gauge1, 0, wx.ALL|wx.ALIGN_CENTER_HORIZONTAL|wx.ALIGN_CENTER_VERTICAL, 5 )
  self.SetSizer( gSizer2 )
  self.Layout()
  gSizer2.Fit( self )
  self.Centre( wx.BOTH )
  self.m_button2.Bind( wx.EVT_BUTTON, self.onButton )
  Publisher().subscribe(self.updateDisplay, "update")
 def updateDisplay(self, msg):
  t = msg.data
  if isinstance(t, int):#如果是数字,说明线程正在执行,显示数字
   self.m_staticText2.SetLabel("%s%%" % t)
   self.m_gauge1.SetValue( t )
  else:#否则线程未执行,将按钮重新开启
   self.m_staticText2.SetLabel("%s" % t)
   self.m_button2.Enable()
 def onButton( self, event ):
  TestThread()
  self.m_staticText2.SetLabel(u"线程开始")
  event.GetEventObject().Disable()

这个就是GUI的主程序,__init__中使用Publisher().subscribe(self.updateDisplay, “update”)声明了获取线程消息以及显示的方法。

if __name__ == "__main__":
 app = wx.PySimpleApp()
 MyForm(None).Show()
 app.MainLoop()

最后将窗口MyForm(None).Show()显示出来,程序就完成了。

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Python's Execution Model: Compiled, Interpreted, or Both?Python's Execution Model: Compiled, Interpreted, or Both?May 10, 2025 am 12:04 AM

Pythonisbothcompiledandinterpreted.WhenyourunaPythonscript,itisfirstcompiledintobytecode,whichisthenexecutedbythePythonVirtualMachine(PVM).Thishybridapproachallowsforplatform-independentcodebutcanbeslowerthannativemachinecodeexecution.

Is Python executed line by line?Is Python executed line by line?May 10, 2025 am 12:03 AM

Python is not strictly line-by-line execution, but is optimized and conditional execution based on the interpreter mechanism. The interpreter converts the code to bytecode, executed by the PVM, and may precompile constant expressions or optimize loops. Understanding these mechanisms helps optimize code and improve efficiency.

What are the alternatives to concatenate two lists in Python?What are the alternatives to concatenate two lists in Python?May 09, 2025 am 12:16 AM

There are many methods to connect two lists in Python: 1. Use operators, which are simple but inefficient in large lists; 2. Use extend method, which is efficient but will modify the original list; 3. Use the = operator, which is both efficient and readable; 4. Use itertools.chain function, which is memory efficient but requires additional import; 5. Use list parsing, which is elegant but may be too complex. The selection method should be based on the code context and requirements.

Python: Efficient Ways to Merge Two ListsPython: Efficient Ways to Merge Two ListsMay 09, 2025 am 12:15 AM

There are many ways to merge Python lists: 1. Use operators, which are simple but not memory efficient for large lists; 2. Use extend method, which is efficient but will modify the original list; 3. Use itertools.chain, which is suitable for large data sets; 4. Use * operator, merge small to medium-sized lists in one line of code; 5. Use numpy.concatenate, which is suitable for large data sets and scenarios with high performance requirements; 6. Use append method, which is suitable for small lists but is inefficient. When selecting a method, you need to consider the list size and application scenarios.

Compiled vs Interpreted Languages: pros and consCompiled vs Interpreted Languages: pros and consMay 09, 2025 am 12:06 AM

Compiledlanguagesofferspeedandsecurity,whileinterpretedlanguagesprovideeaseofuseandportability.1)CompiledlanguageslikeC arefasterandsecurebuthavelongerdevelopmentcyclesandplatformdependency.2)InterpretedlanguageslikePythonareeasiertouseandmoreportab

Python: For and While Loops, the most complete guidePython: For and While Loops, the most complete guideMay 09, 2025 am 12:05 AM

In Python, a for loop is used to traverse iterable objects, and a while loop is used to perform operations repeatedly when the condition is satisfied. 1) For loop example: traverse the list and print the elements. 2) While loop example: guess the number game until you guess it right. Mastering cycle principles and optimization techniques can improve code efficiency and reliability.

Python concatenate lists into a stringPython concatenate lists into a stringMay 09, 2025 am 12:02 AM

To concatenate a list into a string, using the join() method in Python is the best choice. 1) Use the join() method to concatenate the list elements into a string, such as ''.join(my_list). 2) For a list containing numbers, convert map(str, numbers) into a string before concatenating. 3) You can use generator expressions for complex formatting, such as ','.join(f'({fruit})'forfruitinfruits). 4) When processing mixed data types, use map(str, mixed_list) to ensure that all elements can be converted into strings. 5) For large lists, use ''.join(large_li

Python's Hybrid Approach: Compilation and Interpretation CombinedPython's Hybrid Approach: Compilation and Interpretation CombinedMay 08, 2025 am 12:16 AM

Pythonusesahybridapproach,combiningcompilationtobytecodeandinterpretation.1)Codeiscompiledtoplatform-independentbytecode.2)BytecodeisinterpretedbythePythonVirtualMachine,enhancingefficiencyandportability.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use