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,我想在读取器获得 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 读取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()
代码无法重现,因为你需要一个RFID Reader,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)
我尝试使用状态变量,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!!
关于python - 暂停和恢复 QThread,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30281621/