问PyQt5:如何向工作线程发送信号
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Stack Overflow用户

提问于 2016-12-07 19:44:36

回答 1查看 4.5K关注 0票数 4

我知道如何将信号从工作线程发送回主GUI线程，但是如何将信号从主线程发送到工作线程？

下面是一些示例代码，其中包含一个信号和插槽。在这里，我正在向主线程发送信号，但是我如何才能向相反的方向前进呢？

这里的目标是在我想要线程停止时发送一个信号，将self.do的值更改为0。

下面是主文件，我将把UI文件放在下面

from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QMainWindow
from PyQt5.QtCore import QThread, QObject, pyqtSignal, pyqtSlot
from progressUI import Ui_Form

import sys
import time

class ProgressBar(QObject):
    progress = pyqtSignal(int)
    kill = pyqtSignal()

    def __init__(self, timer, parent=None):
        super(ProgressBar, self).__init__(parent)
        self.time = timer
        self.do = 1

    def work(self):

        while self.do == 1:
            y = 0
            for _ in range(100):
                time.sleep(.1)
                y += 1
                self.progress.emit(y)
            break

        self.kill.emit()

    @pyqtSlot(str)
    def worker_slot(self, sentence):
        print(sentence)

class Go(QMainWindow, Ui_Form, QObject):
    custom_signal = pyqtSignal(str)

    def __init__(self, parent=None):
        QMainWindow.__init__(self, parent)
        self.setupUi(self)
        self.progressBar.setValue(0)
        self.startThread()

    @pyqtSlot(int)
    def updateProgress(self, val):
        self.progressBar.setValue(val)
        self.custom_signal.emit('hi from main thread')

    def startThread(self):
        self.progressThread = ProgressBar(60)
        self.thread = QThread()
        self.progressThread.moveToThread(self.thread)

        self.progressThread.progress.connect(self.updateProgress)
        self.progressThread.kill.connect(self.thread.quit)
        self.custom_signal.connect(self.progressThread.worker_slot)
        self.thread.started.connect(self.progressThread.work)

        self.thread.start()



if __name__ == '__main__':
     app = QtWidgets.QApplication(sys.argv)
     MainApp = Go()
     MainApp.show()
     sys.exit(app.exec_())

这是UI文件。

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(658, 118)
        self.progressBar = QtWidgets.QProgressBar(Form)
        self.progressBar.setGeometry(QtCore.QRect(30, 40, 601, 23))
        self.progressBar.setProperty("value", 24)
        self.progressBar.setObjectName("progressBar")
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(45, 75, 581, 26))
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "TextLabel"))