在 Python 中同时运行多个 qthreads [英] Run multiple qthreads concurrently in Python

问题描述

在附加的代码中，当您单击 start 时，它会创建一个 QSpinBox 并开始在 QThread 中计数到 20，但是如果我单击 start 在计数时再次开始，第一个 QSpinBox 停止，一个新的获得焦点，两个计数器都在其中运行，但我需要所有旋转同时单独运行:

In the attached code when you click start it creates a QSpinBox and starts counting to 20 in QThread, but if I click start again while it is counting, the first QSpinBox stops and a new one takes the focus, and both counters run in it, but I need all spins to run at the same time separately:

import sys
import time
from PySide.QtGui import *
from PySide.QtCore import *

class frmMain(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        self.btStart = QPushButton('Start')
        self.btStop = QPushButton('Stop')
        self.counter = QSpinBox()
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.btStart)
        self.layout.addWidget(self.btStop)
        self.layout.addWidget(self.counter)
        self.setLayout(self.layout)
        self.btStart.clicked.connect(self.start_thread)
        self.btStop.clicked.connect(self.stop_thread)
        self.boxes = []

    def stop_thread(self):
        self.th.stop()

    def loopfunction(self, x):
        self.boxes[-1].setValue(x)

    def start_thread(self):
        self.th = thread(2)
        self.th.loop.connect(self.loopfunction)
        self.th.setTerminationEnabled(True)
        self.boxes.append(QSpinBox())
        self.layout.addWidget(self.boxes[-1])
        self.th.start()

class thread(QThread):
    loop = Signal(object)

    def __init__(self, x):
        QThread.__init__(self)
        self.x = x

    def run(self):
        for i in range(20):
            self.x = i
            self.loop.emit(self.x)
            time.sleep(0.5)

    def stop(self):
        self.stop()


app = QApplication(sys.argv)
win = frmMain()

win.show()
sys.exit(app.exec_())

推荐答案

我做了一些关键的改变:

I made a few key changes:

• 在覆盖同一个线程对象时保留一个单独线程的列表，
• 修复了停止线程时的递归错误；使用 terminate 代替，
• 线程会跟踪它自己的索引，因此它知道要更新哪个旋转框.

当您按下停止键或停止后按下开始键时，您想要发生的事情并不是很清楚，但是这段代码或多或少应该对您有用:

It's not really clear what you want to happen when you press stop, or press start after stopping, but this code should more or less work for you:

import sys
import time
from PySide.QtGui import *
from PySide.QtCore import *

class frmMain(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        self.btStart = QPushButton('Start')
        self.btStop = QPushButton('Stop')
        #self.counter = QSpinBox()
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.btStart)
        self.layout.addWidget(self.btStop)
        #self.layout.addWidget(self.counter)
        self.setLayout(self.layout)
        self.btStart.clicked.connect(self.start_thread)
        self.btStop.clicked.connect(self.stop_thread)
        self.boxes = []
        self.threads = []

    def stop_thread(self):
        for th in self.threads:
            th.terminate()

    def loopfunction(self, n, index):
        self.boxes[index].setValue(n)

    def start_thread(self):
        index = len(self.threads)
        th = thread(index)
        th.loop.connect(self.loopfunction)
        th.setTerminationEnabled(True)
        th.start()
        self.threads.append(th)        
        self.boxes.append(QSpinBox())
        self.layout.addWidget(self.boxes[index])        


class thread(QThread):
    loop = Signal(int, int)

    def __init__(self, index):
        QThread.__init__(self)
        self.index = index

    def run(self):
        for n in range(20):
            self.loop.emit(n, self.index)
            time.sleep(0.5)


app = QApplication(sys.argv)
win = frmMain()

win.show()
sys.exit(app.exec_())

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