子进程的关闭
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from multiprocessing import Process, Queue
import threading
import time
class MyProcess(Process):
def __init__(self, q, data):
super().__init__()
self.q = q
self.data = data
def run(self):
time.sleep(20)
print('子进程开始put数据')
self.data.append('123')
self.q.put(self.data)
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.q = Queue()
self.data = ['111', '222', '333'] # 要传递的列表
self.button = QPushButton('启动子进程', self)
self.button.clicked.connect(self.start_child_process)
def start_child_process(self):
def run_child_process():
p = MyProcess(self.q, self.data)
p.start()
p.join()
p.close() # 关闭子进程
# 子进程完成后的逻辑
result = self.q.get()
print('主进程获取Queue数据:', result)
self.q.close() # 关闭队列
thread = threading.Thread(target=run_child_process)
thread.start()
# 允许GUI事件循环继续处理其他事件
while thread.is_alive():
QApplication.processEvents()
if __name__ == '__main__':
app = QApplication([])
window = MainWindow()
window.show()
app.exec_()
子线程的关闭
import inspect
import ctypes
def _async_raise(tid, exctype):
"""raises the exception, performs cleanup if needed"""
tid = ctypes.c_long(tid)
if not inspect.isclass(exctype):
exctype = type(exctype)
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, ctypes.py_object(exctype))
if res == 0:
raise ValueError("invalid thread id")
elif res != 1:
# """if it returns a number greater than one, you're in trouble,
# and you should call it again with exc=NULL to revert the effect"""
ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, None)
raise SystemError("PyThreadState_SetAsyncExc failed")
def stop_thread(thread):
_async_raise(thread.ident, SystemExit)
停止线程
stop_thread(myThread)
