Question

我在线程上已经阅读了很多内容，但我真的需要这方面的帮助：我有一个PyQt主GUI，使用scipy.minimize运行优化... 我不能不举一个例子，我使用“占位符”过程显示我的问题。

如果进程花费的时间太长，我想让主GUI仍然可以被用户停止结果。我的工作示例是这个，我使用与sympy的集成

import sympy as sp
import numpy as np
import matplotlib.pyplot as plt
import time, sys
from PyQt4.QtCore  import *
from PyQt4.QtGui import *

class IntegrationRunner(QObject):
    'Object managing the integration'

    def __init__(self):
        super(IntegrationRunner, self).__init__() 
        self._isRunning = True

    def longRunning(self):      
        # reset
        if not self._isRunning:
            self._isRunning = True  

        print("preparing Integration")
        #this is known to be time consuming and returning not the right integral
        #this is a placeholder for a "time consuming" operation that sould 
        #be handled by a thread outside the main GUI
        #imagine an optimization process or any other time consuming operation
        #that would freeze the Main GUI

        t=sp.symbols('t')
        exp=sp.sqrt((3*t+1)/t)
        sol=sp.integrate(exp,t)
        print(sol)

        print('finished...') 

    def stop(self):
        self._isRunning = False
        #this is displayed when the "stop button" is clicked 
        #but actually the integration process won´t stop
        print("Integration too long - User terminated")

class SimulationUi(QDialog):
    'PyQt interface'

    def __init__(self):
        super(SimulationUi, self).__init__()

        self.goButton = QPushButton('Run Integration')
        self.stopButton = QPushButton('Stop if too long')


        self.layout = QHBoxLayout()
        self.layout.addWidget(self.goButton)
        self.layout.addWidget(self.stopButton)

        self.setLayout(self.layout)

        self.simulThread = QThread()
        self.simulThread.start()

        self.simulIntegration = IntegrationRunner()
        self.simulIntegration.moveToThread(self.simulThread)
        #self.simulIntegration.stepIncreased.connect(self.currentStep.setValue)

        # call stop on Integr.Runner from this (main) thread on click
        self.stopButton.clicked.connect(lambda: self.simulIntegration.stop())
        self.goButton.clicked.connect(self.simulIntegration.longRunning)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    simul = SimulationUi()
    simul.show()
    sys.exit(app.exec_())

在集成自动停止之前单击“开始”按钮和“停止”按钮我得到了这个输出：

>>preparing Integration
>>Integration too long - User terminated
>>Integral(sqrt((3*t + 1)/t), t)
>>finished...

这不完全是我的问题，但我想了解如何使用我可以放置的线程耗时的计算并停止它们以尝试其他“参数”或“初始猜测” 使用Scipy Minimize之类的东西是否有可能从“外部”停止迭代功能并重新启动它而不会进入“无响应”？任何有待改进的帮助表示赞赏。我把这些例子作为指导 how-to-signal-from-a-running-qthread-back-to-... 和pastebin

PyQt：如果运行时间过长，如何使用Qthread使进程停止运行

0 个答案: