有人可以帮助我,应用只是崩溃。
我完成了研究,发现this 以下是我的代码:
from PyQt5.QtCore import QThread, pyqtSignal
import threading
import time
class Job(QThread):
data_downloaded = pyqtSignal(str)
def __init__(self, url):
QThread.__init__(self)
# self.__flag = threading.Event()
# self.__flag.set()
# self.__running = threading.Event()
# self.__running.set()
def run(self):
for i in range(100):
self.data_downloaded.emit("B") # 朝connect的函数发射一个进度信号
time.sleep(1)
# def pause(self):
# self.__flag.clear() # 设置为False, 让线程阻塞
#
# def resume(self):
# self.__flag.set() # 设置为True, 让线程停止阻塞
#
# def stop(self):
# self.__flag.set() # 将线程从暂停状态恢复, 如何已经暂停的话
# self.__running.clear() # 设置为False
主窗口:
from xxx import Job
class SearchWindow(QWidget):
......
...... # There's a QTableWidget on main window, after right clicked "Start Download", Job will be created
......
def right_click_from_download_list_context(self):
row_num = []
for i in self.download_list.selectionModel().selection().indexes():
row_num.append(i.row())
popMenu = QMenu(self)
self.start_download_action = QAction('Start Download', self)
self.remove_task_action = QAction('删除此任务', self)
self.start_download_action.triggered.connect(self.start_download)
self.remove_task_action.triggered.connect(partial(self.remove_task, row_num))
popMenu.addAction(self.start_download_action)
popMenu.addAction(self.remove_task_action)
popMenu.exec_(QCursor.pos())
def start_download(self):
print("AAAA")
downloader = Job("http://www.baidu.com")
print("BBB")
downloader.data_downloaded.connect(self.update_download_process)
print("ccc")
downloader.start()
print("ddd")
@pyqtSlot(str)
def update_download_process(self, data_process):
print(data_process)
我做了一些调试,“AAAA”,“BBB”,“ccc”,“ddd”可以成功打印出来,所以我猜错误是在我的Job QThread中。
有人帮我一个忙,我只是找不到错误的地方。在此先感谢:)
答案 0 :(得分:1)
问题是因为只要函数执行,函数内创建的变量就会存在,而downloader
的消除也会消除该线程。为此,有两种解决方案:
downloader
成员:def start_download(self):
print("AAAA")
self.downloader = Job("http://www.baidu.com")
print("BBB")
self.downloader.data_downloaded.connect(self.update_download_process)
print("ccc")
self.downloader.start()
print("ddd")
class Job(QThread):
data_downloaded = pyqtSignal(str)
def __init__(self, url, parent=None):
QThread.__init__(self, parent)
[...]
class SearchWindow(QWidget):
[...]
def start_download(self):
print("AAAA")
downloader = Job("http://www.baidu.com", self)
print("BBB")
downloader.data_downloaded.connect(self.update_download_process)
print("ccc")
downloader.start()
print("ddd")