在Python中并发运行多个qthreads

Question

在所附的代码中，当您单击开始时，它将创建一个QSpinBox，并开始在QThread中计数到20，但如果我在计数时再次单击开始，第一个QSpinBox停止，一个新的开始占据焦点，两个计数器都在其中运行，但我需要所有的旋转同时单独运行：

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_())

Answer 1

我做了一些关键的改变：

• 在重写同一个线程对象时保留了一个单独线程的列表
• 修复了停止线程时的递归错误；改为使用terminate
• 线程跟踪自己的索引，以便知道要更新哪个数字调整框。在

现在还不清楚您在按stop或在停止后按start时希望发生什么，但下面的代码应该或多或少对您有用：

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_())