在pyqt5中使用qthread的时候，要注意把所有qthread的对象在主类中的init(或者放在所有类函数的外面)中进行实例化，不然可能在多个qthread互相调用的时候，emit重复的信号。一般比较正确的写法如下所示，基本照着这种框架搭建都是没问题的。
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# -*- coding: utf-8 -*-
import sys
import time
from pyqt5.qtwidgets import *
from pyqt5.qtcore import *
class mainui(qwidget):
def __init__(self):
super(mainui, self).__init__()
self.resize(400, 200)
self.setwindowtitle('qthread例子')
# 实例化多线程对象
self.thread = worker()
# 实例化列表控件与按钮控件
self.listfile = qlistwidget()
self.btnstart = qpushbutton('开始')
self.btn_over = qpushbutton('结束')
# 把控件放置在栅格布局中
layout = qgridlayout(self)
layout.addwidget(self.listfile, 0, 0, 1, 2)
layout.addwidget(self.btnstart, 1, 0)
layout.addwidget(self.btn_over, 1, 1)
# 信号与槽函数的连接
self.btnstart.clicked.connect(self.slotstart)
self.btn_over.clicked.connect(self.slot_btn_over)
# 建立线程信号的槽连接
self.thread.trigger.connect(self.slotadd)
def slotadd(self, msg):
print(msg)
if int(msg) % 2 == 0:
self.listfile.additem(msg)
else:
pass
self.thread.exit()
def slotstart(self):
self.btnstart.setenabled(false)
self.thread.start()
def slot_btn_over(self):
self.btnstart.setenabled(true)
self.thread.terminate()
self.thread.num = 0
class worker(qthread):
trigger = pyqtsignal(str)
num = 0
def __init__(self):
super(worker, self).__init__()
def run(self):
while true:
print('num= ', self.num)
if self.num % 2 == 0:
self.trigger.emit(str(50))
elif self.num == 200:
self.num = 0
else:
pass
time.sleep(0.1)
self.num += 1
if __name__ == '__main__':
app = qapplication(sys.argv)
w = mainui()
w.show()
sys.exit(app.exec_())
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以上这篇pyqt5中qthread在使用时出现重复emit的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/shangxiaqiusuo1/article/details/90678857