我试图使用qthread运行一个worker类。如果使用workerObject = workerClass（）实例化worker，我可以毫无问题地执行此操作。如果工人类需要始终执行退出？
，我该怎么做呢？以下是尝试执行此操作的示例代码。不幸的是，通过运行它，退出函数不会被执行，很可能这是因为线程不知道with / as语句
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import QThread, QObject, pyqtSignal, pyqtSlot
import sys
import time
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName(_fromUtf8("Dialog"))
Dialog.resize(400, 284)
self.textEdit = QtGui.QTextEdit(Dialog)
self.textEdit.setGeometry(QtCore.QRect(20, 20, 361, 191))
self.textEdit.setObjectName(_fromUtf8("textEdit"))
self.pushButton = QtGui.QPushButton(Dialog)
self.pushButton.setGeometry(QtCore.QRect(170, 250, 75, 23))
self.pushButton.setObjectName(_fromUtf8("pushButton"))
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
Dialog.setWindowTitle(_translate("Dialog", "Dialog", None))
self.pushButton.setText(_translate("Dialog", "Print", None))
class UI_MainWindow(QtGui.QMainWindow, Ui_Dialog):
def __init__(self, parent=None):
super(UI_MainWindow, self).__init__(parent)
self.setupUi(self)
self.pushButton.clicked.connect(self.run)
def run(self):
self.t = QThread()
self.x = None
with worker() as self.x:
self.x.signal.connect(self.write)
self.x.moveToThread(t)
t.started.connect(self.x.run)
t.start()
@pyqtSlot(str)
def write(self, text):
self.textEdit.append("Running")
qtObject.processEvents()
class worker(QObject):
signal = pyqtSignal(str)
def __init__(self, parent = None):
super(worker, self).__init__(parent)
def __enter__(self):
return self
def run(self):
self.signal.emit("Running")
time.wait(5)
raise Exception
def __exit__(self, exc_type, exc_value, traceback):
if exc_type:
self.signal.emit("Exception")
def main(qtObject, guiObj):
guiObj.show()
qtObject.exec_()
qtObject.processEvents()
qtObject = QtGui.QApplication(sys.argv)
guiObj = UI_MainWindow()
main(qtObject, guiObj)
LE：上下文涉及需要在QTextEdit窗口中打印来自worker类的任何失败消息。在worker类执行期间引发的任何异常都在其exit函数中处理，这样无论发生什么错误，脚本都会优雅地为用户提供有意义的信息和指令。
答案 0 :(得分：0)
__exit__函数 执行 执行，问题是由于线程的非阻塞性质，with构造立即在工人＆＃34;完成之前终止（调用worker.__exit__）＆＃34;并提出异常。
实现所需目标的一种方法是使用worker.run()语句将try/except中的代码包围起来，以捕获任何未处理的异常并执行任何清理或发出信号。
def run(self):
try:
self.signal.emit("Running")
time.sleep(5)
raise Exception
except:
self.signal.emit("Exception")
答案 1 :(得分：0)
从user3419537解决方案开始，我已经完成了以下解决方案。第二个信号（statusSignal）用于将所有与异常相关的信息传回主类，以便可以调用exit函数。
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import QThread, QObject, pyqtSignal, pyqtSlot
import sys
import time
class err(Exception):
def __init__(self, *args):
self.args = [a for a in args]
mainThread = QtCore.QThread.currentThread()
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName(_fromUtf8("Dialog"))
Dialog.resize(400, 284)
self.textEdit = QtGui.QTextEdit(Dialog)
self.textEdit.setGeometry(QtCore.QRect(20, 20, 361, 191))
self.textEdit.setObjectName(_fromUtf8("textEdit"))
self.pushButton = QtGui.QPushButton(Dialog)
self.pushButton.setGeometry(QtCore.QRect(170, 250, 75, 23))
self.pushButton.setObjectName(_fromUtf8("pushButton"))
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
Dialog.setWindowTitle(_translate("Dialog", "Dialog", None))
self.pushButton.setText(_translate("Dialog", "Print", None))
class UI_MainWindow(QtGui.QMainWindow, Ui_Dialog):
def __init__(self, parent=None):
super(UI_MainWindow, self).__init__(parent)
self.setupUi(self)
self.pushButton.clicked.connect(self.run)
def run(self):
self.t = QThread()
self.x = worker()
self.x.signal.connect(self.write)
self.x.statusSignal.connect(self.runExit)
self.x.moveToThread(self.t)
self.t.started.connect(self.x.run)
self.t.start()
@pyqtSlot(str)
def write(self, text):
self.textEdit.append(text)
qtObject.processEvents()
@pyqtSlot(object, object, object)
def runExit(self, exc_type, exc_value, exc_traceback):
self.t2 = QThread()
self.x.moveToThread(self.t2)
self.t2.started.connect(lambda: self.x.__exit__(exc_type, exc_value, exc_traceback))
self.t2.start()
class worker(QObject):
signal = pyqtSignal(str)
statusSignal = pyqtSignal(object, object, object)
def __init__(self, parent = None):
super(worker, self).__init__(parent)
def run(self):
try:
self.signal.emit("Run")
time.sleep(2)
self.moveToThread(mainThread)
raise err("err message")
except err:
exc_type, exc_value, exc_traceback = sys.exc_info()
self.statusSignal.emit(exc_type, exc_value, exc_traceback)
def __exit__(self, exc_type, exc_value, traceback):
if exc_type:
self.signal.emit(exc_value.args[0])
def main(qtObject, guiObj):
guiObj.show()
qtObject.exec_()
qtObject.processEvents()
qtObject = QtGui.QApplication(sys.argv)
guiObj = UI_MainWindow()
main(qtObject, guiObj)
最有可能仍然会对代码进行一些调整，但就目前而言，它完美无缺。