我想问一下，在我开始一些措施后，如何刷新QLCDNumbers。 我创建了一个 GUI 线程来像这样将信号连接到 QLCDNumbers:
class BtDialog(QtGui.QDialog, Dlg):
def __init__(self):
QtGui.QDialog.__init__(self)
self.setupUi(self)
self.thread = WorkerThread()
#Configure slots
self.connect(self.startButton, QtCore.SIGNAL("clicked()"), self.onStart)
self.connect(self.stopButton, QtCore.SIGNAL("clicked()"), self.onStop)
#QLCDNumber Slot
self.connect(self.thread, self.thread.voltage, self.lcdVoltage.display)
def onStart(self):
self.thread.start()
def onStop(self):
self.emit(self.thread.voltage, 0) #Trying to refresh
abort()
这里我连接了两个按钮，一个用于启动工作线程，另一个用于停止进程。当我停止该过程时，我想通过显示“0”来刷新 QLCDNumber，但它不起作用。 在工作线程中，我像这样初始化信号:
def __init__(self, parent = None):
QtCore.QThread.__init__(self, parent)
self.voltage = QtCore.SIGNAL("voltage")
当进程运行时，我发出信号
self.emit(self.voltage, volt_act)
测量后。到目前为止有效。但是当我想再次启动工作进程时停止后，信号不会再次发送到 QLCDNumber。为此，我必须重新启动 GUI。如何解决我的两个问题，即我想刷新 QLCDNumber 并在停止并刷新再次发出信号后解决这个问题？
请您参考如下方法:
无法从您发布的代码中看出问题出在哪里，但这应该可以帮助您修改它，还可以查看 new-style signal/slot connections 的文档和 further reference (modal dialogs, timers, etc) :
#!/usr/bin/env python
#-*- coding:utf-8 -*-
import time
from PyQt4 import QtGui, QtCore
class MyThread(QtCore.QThread):
countChange = QtCore.pyqtSignal(int)
countReset = QtCore.pyqtSignal(int)
def __init__(self, parent=None):
super(MyThread, self).__init__(parent)
self.stopped = QtCore.QEvent(QtCore.QEvent.User)
def start(self):
self.stopped.setAccepted(False)
self.count = 0
super(MyThread, self).start()
def run(self):
while not self.stopped.isAccepted():
self.count += 1
self.countChange.emit(self.count)
time.sleep(1)
self.countReset.emit(0)
def stop(self):
self.stopped.setAccepted(True)
class MyWindow(QtGui.QDialog):
def __init__(self, parent=None):
super(MyWindow, self).__init__(parent)
self.lcdNumber = QtGui.QLCDNumber(self)
self.pushButtonStart = QtGui.QPushButton(self)
self.pushButtonStart.setText("Start")
self.pushButtonStart.clicked.connect(self.on_pushButtonStart_clicked)
self.pushButtonStop = QtGui.QPushButton(self)
self.pushButtonStop.setText("Stop")
self.pushButtonStop.clicked.connect(self.on_pushButtonStop_clicked)
self.pushButtonDone = QtGui.QPushButton(self)
self.pushButtonDone.setText("Done")
self.pushButtonDone.clicked.connect(self.on_pushButtonDone_clicked)
self.layoutHorizontal = QtGui.QHBoxLayout(self)
self.layoutHorizontal.addWidget(self.lcdNumber)
self.layoutHorizontal.addWidget(self.pushButtonStart)
self.layoutHorizontal.addWidget(self.pushButtonStop)
self.layoutHorizontal.addWidget(self.pushButtonDone)
self.thread = MyThread(self)
self.thread.countChange.connect(self.lcdNumber.display)
self.thread.countReset.connect(self.lcdNumber.display)
@QtCore.pyqtSlot()
def on_pushButtonStart_clicked(self):
self.thread.start()
@QtCore.pyqtSlot()
def on_pushButtonStop_clicked(self):
self.thread.stop()
@QtCore.pyqtSlot()
def on_pushButtonDone_clicked(self):
sys.exit()
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
app.setApplicationName('MyWindow')
main = MyWindow()
main.exec_()
sys.exit(app.exec_())
