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.

解决方法:

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!!

标签：python,pyqt,pyqt4,qthread

来源： https://codeday.me/bug/20190702/1360083.html