我正在尝试在QThread中使用单次计时器,但它不起作用。以下是我正在使用的代码:
class thread1((QtCore.QThread):
def __init__(self,parent):
QtCore.QThread.__init__(self, parent)
self.Timer1 = None
def __del__(self):
self.wait()
def timerPINNo(self):
print "Timer completed"
def run(self):
tempVal0 = getData()
if tempVal0 == 0:
self.Timer1 = QtCore.QTimer()
self.Timer1.timeout.connect(self.timerPINNo)
self.Timer1.setSingleShot(True)
self.Timer1.start(5000)
else: pass
我面临的问题是超时后,timerPINNo 函数永远不会被调用。单次拍摄在正常使用时有效,但当我从 QThread 调用它时则不起作用。我哪里犯了错误?
导致此问题的原因是,如果 run 方法完成执行,线程将完成其执行,因此它被消除,因此计时器也会被消除。解决方案是保持运行方法运行,必须使用QEventLoop
。
import sys
from PyQt4 import QtCore
class thread1(QtCore.QThread):
def __init__(self,*args, **kwargs):
QtCore.QThread.__init__(self, *args, **kwargs)
self.Timer1 = None
def __del__(self):
self.wait()
def timerPINNo(self):
print("Timer completed")
def run(self):
tempVal0 = getData()
if tempVal0 == 0:
self.Timer1 = QtCore.QTimer()
self.Timer1.timeout.connect(self.timerPINNo)
self.Timer1.setSingleShot(True)
self.Timer1.start(5000)
loop = QtCore.QEventLoop()
loop.exec_()
if __name__ == "__main__":
app = QtCore.QCoreApplication(sys.argv)
th = thread1()
th.start()
sys.exit(app.exec_())