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