python – 暂停和恢复QThread

2019年8月6日 485次阅读

我正在尝试暂停QThread并恢复它.

所以,我在QThread中有一个RFID读取循环,我想在阅读器获得RFID代码时暂停无限循环.之后,有一个数据库检查.在检查结束时,我想恢复RFID阅读循环以获取其他代码.

MVCE：

def main():
    global Thread
    app = QtGui.QApplication(sys.argv)
    main = Main()
    Thread = RFID_Thread()
    Thread.rfid_event.connect(Main().on_event)
    Thread.start()
    sys.exit(app.exec_())

class Main(object):
    def __init__(self):
        self.accueil = MainWindow(self)
        self.access = AccessWindow()
        self.accueil.show()

    def on_event(self, data):
        # I WANT TO PAUSE THE QTHREAD HERE

        ###################################
        #   CHECKING DB & SHOWING UI      #
        ###################################

        # AND RESUME IT HERE
class RFID_Thread(QtCore.QThread):
    rfid_event = pyqtSignal(str, name='rfid_event')
    def run(self):
        while 1:
            ser = serial.Serial(port=Serial_Port, baudrate=Serial_Baudrate)
            a = ser.read(19).encode('hex')
            ser.close()
            if len(a) <> 0:
                Code = a[14:]
                self.rfid_event.emit(Code)
                time.sleep(2)

if __name__=='__main__':
    main()

代码无法再现,因为您需要RFID阅读器,但我们可以通过这两行来模拟他,而不是打开串口并从中读取数据：

a = "**************e20030654408021520403f4b"
time.sleep(4)

我试图使用状态变量,但它不起作用.

最佳答案 最后我自己解决了这个问题

MVCE：

def main():
    global Thread
    app = QtGui.QApplication(sys.argv)
    main = Main()
    Thread = RFID_Thread()
    Thread.rfid_event.connect(Main().on_event)
    Thread.start()
    sys.exit(app.exec_())

class Main(object):
    def __init__(self):
        self.accueil = MainWindow(self)
        self.access = AccessWindow()
        self.accueil.show()

    def on_event(self, data):
        # I WANT TO PAUSE THE QTHREAD HERE

        Thread.Pause = False
        ###################################
        #   CHECKING DB & SHOWING UI      #
        ###################################

        # AND RESUME IT HERE
        Thread.Pause = True
class RFID_Thread(QtCore.QThread):
    rfid_event = pyqtSignal(str, name='rfid_event')
    Pause = True
    def run(self):
        while 1:
            if Pause:
                  ser = serial.Serial(port=Serial_Port, baudrate=Serial_Baudrate)
                  a = ser.read(19).encode('hex')
                  ser.close()
                  if len(a) <> 0:
                         Code = a[14:]
                         self.rfid_event.emit(Code)
                         time.sleep(2)
            else:
                  continue
 if __name__=='__main__':
    main()

最后,状态变量是解决方案!!

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