这是使用QObject.moveToThread 实现PyQt 多线程程序的简化版本。基本上,我在单独的线程上查询网页并提取 HMTL 内容。
我在从 IDLE 运行代码或 Windows 命令行挂起 python 时遇到这个问题。 Windows cmd 显示“QThread:线程仍在运行时已被销毁”。但是,如果我从 Pycharm 运行它,一切正常。
您可以获得.ui 文件here
有什么想法吗?
import requests
import sys
from PyQt4 import QtGui, uic
from PyQt4.QtCore import QObject, pyqtSlot, pyqtSignal, QThread
qtCreatorFile = "window.ui"
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)
class HttpClient(QObject):
finished = pyqtSignal(str)
def __init__(self):
QObject.__init__(self)
@pyqtSlot()
def retrieve_page(self, url):
response = requests.get(url)
self.finished.emit(response.text)
class HtmlGetter(QtGui.QMainWindow, Ui_MainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
Ui_MainWindow.__init__(self)
self.setupUi(self)
self.go_button.clicked.connect(self.query_page)
def query_page(self):
http_client = HttpClient()
temp_thread = QThread()
http_client.moveToThread(temp_thread)
temp_thread.started.connect(
lambda: http_client.retrieve_page("http://www.google.com/"))
http_client.finished.connect(self.show_html)
# Terminating thread gracefully.
http_client.finished.connect(temp_thread.quit)
http_client.finished.connect(http_client.deleteLater)
temp_thread.finished.connect(temp_thread.deleteLater)
temp_thread.start()
def show_html(self, html_text):
print(html_text)
def main():
app = QtGui.QApplication(sys.argv)
window = HtmlGetter()
window.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
最佳答案
我想通了:
http_client 和temp_thread 都必须是属性或HtmlGetter 类。我认为这是因为否则 python 在退出函数时会丢弃它们。这是工作代码:
import requests
import sys
from PyQt4 import QtGui, uic
from PyQt4.QtCore import QObject, pyqtSlot, pyqtSignal, QThread
qtCreatorFile = "window.ui"
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)
class HttpClient(QObject):
finished = pyqtSignal()
send_text = pyqtSignal(str)
def __init__(self):
QObject.__init__(self)
@pyqtSlot()
def retrieve_page(self, url):
response = requests.get(url)
self.send_text.emit(response.text)
self.finished.emit()
class HtmlGetter(QtGui.QMainWindow, Ui_MainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
Ui_MainWindow.__init__(self)
self.setupUi(self)
self.go_button.clicked.connect(self.query_page)
def query_page(self):
self.http_client = HttpClient()
self.temp_thread = QThread()
self.http_client.moveToThread(self.temp_thread)
self.temp_thread.started.connect(
lambda: self.http_client.retrieve_page("http://www.google.com/"))
self.http_client.send_text.connect(self.show_html)
# Terminating thread gracefully.
self.http_client.finished.connect(self.temp_thread.quit)
self.http_client.finished.connect(self.http_client.deleteLater)
self.temp_thread.finished.connect(self.temp_thread.deleteLater)
self.temp_thread.start()
def show_html(self, html_text):
print(html_text)
def main():
app = QtGui.QApplication(sys.argv)
window = HtmlGetter()
window.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
关于python - 从 Windows cmd 或 IDLE 而不是 PyCharm 运行时出现 "QThread: Destroyed while thread is still running"?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38829023/