由于计时器错误，PyQt 一直关闭很可能
PyQt keeps closing most likely due to timer error
我正在尝试让一行文本显示在 pyqt4 文本浏览器中。我能够让它显示，但每当我开始调整 window 的大小时，我 运行 函数 PyQt window 关闭。目前，它只是关闭而没有显示错误或其他任何内容。在它显示此错误之前：
QObject::startTimer: timers cannot be started from another thread
我已经尝试了 .append() 和 .instertPlainText()。附加是我从中得到错误的地方。感谢您的帮助，如有不明之处请见谅。
这是我的代码：
class MyForm(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.stopAutoRun=0
self.ui.autoButton.clicked.connect(self.autoRun)
self.waitTime=.2
'''
________________________________________________________________________________
autoRun
Description: will continously look for a new JSON file and process it once it appears
_______________________________________________________
'''
def autoRun(self):
self.task1=threading.Thread(target=self.autoRunThread)
self.task1.setDaemon(True)
self.task1.start()
def autoRunThread(self):
self.task1=threading.currentThread()
while getattr(self.task1,"run",True):
commands=powerSupply.setValuesFile()
data=powerSupply.readValues()
self.ui.commandOutput.insertPlainText(str(data))
time.sleep(self.waitTime)
ui:
from PyQt4 import QtCore, QtGui
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_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(1270, 805)
MainWindow.setMinimumSize(QtCore.QSize(0, 0))
MainWindow.setMouseTracking(True)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.verticalLayout_3 = QtGui.QVBoxLayout(self.centralwidget)
self.verticalLayout_3.setObjectName(_fromUtf8("verticalLayout_3"))
spacerItem = QtGui.QSpacerItem(20, 40, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout_3.addItem(spacerItem)
self.gridLayout_3 = QtGui.QGridLayout()
self.gridLayout_3.setObjectName(_fromUtf8("gridLayout_3"))
self.verticalLayout = QtGui.QVBoxLayout()
self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
spacerItem1 = QtGui.QSpacerItem(20, 60, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem1)
self.openButton = QtGui.QPushButton(self.centralwidget)
self.openButton.setMinimumSize(QtCore.QSize(140, 28))
self.openButton.setMaximumSize(QtCore.QSize(140, 28))
self.openButton.setObjectName(_fromUtf8("openButton"))
self.verticalLayout.addWidget(self.openButton)
spacerItem2 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem2)
self.runButton = QtGui.QPushButton(self.centralwidget)
self.runButton.setMinimumSize(QtCore.QSize(140, 28))
self.runButton.setMaximumSize(QtCore.QSize(140, 28))
self.runButton.setObjectName(_fromUtf8("runButton"))
self.verticalLayout.addWidget(self.runButton)
spacerItem3 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem3)
self.autoButton = QtGui.QPushButton(self.centralwidget)
self.autoButton.setObjectName(_fromUtf8("autoButton"))
self.verticalLayout.addWidget(self.autoButton)
spacerItem4 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem4)
self.stopAutoButton = QtGui.QPushButton(self.centralwidget)
self.stopAutoButton.setObjectName(_fromUtf8("stopAutoButton"))
self.verticalLayout.addWidget(self.stopAutoButton)
spacerItem5 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem5)
self.outputButton = QtGui.QPushButton(self.centralwidget)
self.outputButton.setMinimumSize(QtCore.QSize(140, 28))
self.outputButton.setMaximumSize(QtCore.QSize(140, 28))
self.outputButton.setStyleSheet(_fromUtf8("\n"
""))
self.outputButton.setObjectName(_fromUtf8("outputButton"))
self.verticalLayout.addWidget(self.outputButton)
spacerItem6 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem6)
self.powerOffButton = QtGui.QPushButton(self.centralwidget)
self.powerOffButton.setStyleSheet(_fromUtf8("background-color: rgb(255, 0, 0);"))
self.powerOffButton.setObjectName(_fromUtf8("powerOffButton"))
self.verticalLayout.addWidget(self.powerOffButton)
spacerItem7 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem7)
self.powerButton = QtGui.QPushButton(self.centralwidget)
self.powerButton.setMinimumSize(QtCore.QSize(140, 28))
self.powerButton.setMaximumSize(QtCore.QSize(100, 28))
self.powerButton.setMouseTracking(True)
self.powerButton.setAcceptDrops(False)
self.powerButton.setStatusTip(_fromUtf8(""))
self.powerButton.setStyleSheet(_fromUtf8("background-color: rgb(255, 0, 0);"))
self.powerButton.setObjectName(_fromUtf8("powerButton"))
self.verticalLayout.addWidget(self.powerButton)
spacerItem8 = QtGui.QSpacerItem(20, 40, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Expanding)
self.verticalLayout.addItem(spacerItem8)
self.gridLayout_3.addLayout(self.verticalLayout, 0, 0, 1, 1)
self.horizontalLayout_2 = QtGui.QHBoxLayout()
self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2"))
self.verticalLayout_2 = QtGui.QVBoxLayout()
self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
self.label = QtGui.QLabel(self.centralwidget)
self.label.setObjectName(_fromUtf8("label"))
self.verticalLayout_2.addWidget(self.label)
self.commandInput = QtGui.QTextBrowser(self.centralwidget)
self.commandInput.setMinimumSize(QtCore.QSize(600, 300))
self.commandInput.setObjectName(_fromUtf8("commandInput"))
self.verticalLayout_2.addWidget(self.commandInput)
self.horizontalLayout_2.addLayout(self.verticalLayout_2)
self.gridLayout_3.addLayout(self.horizontalLayout_2, 0, 1, 1, 1)
self.verticalLayout_3.addLayout(self.gridLayout_3)
self.label_2 = QtGui.QLabel(self.centralwidget)
self.label_2.setObjectName(_fromUtf8("label_2"))
self.verticalLayout_3.addWidget(self.label_2)
self.commandOutput = QtGui.QTextBrowser(self.centralwidget)
self.commandOutput.setMaximumSize(QtCore.QSize(16777215, 100))
self.commandOutput.setObjectName(_fromUtf8("commandOutput"))
self.verticalLayout_3.addWidget(self.commandOutput)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 1270, 26))
self.menubar.setObjectName(_fromUtf8("menubar"))
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.openButton.setToolTip(_translate("MainWindow", "manually chose a JSON file to run", None))
self.openButton.setText(_translate("MainWindow", "Open File", None))
self.runButton.setToolTip(_translate("MainWindow", "runs the chosen JSON file", None))
self.runButton.setText(_translate("MainWindow", "Run File", None))
self.autoButton.setToolTip(_translate("MainWindow", "starts to automatically run new JSON files in directory", None))
self.autoButton.setText(_translate("MainWindow", "Auto Run", None))
self.stopAutoButton.setToolTip(_translate("MainWindow", "Stops the auto run funtion", None))
self.stopAutoButton.setText(_translate("MainWindow", "Stop Auto Run", None))
self.outputButton.setToolTip(_translate("MainWindow", "changes where the file is being stored during while this GUI instance is open", None))
self.outputButton.setText(_translate("MainWindow", "Change Output File", None))
self.powerOffButton.setToolTip(_translate("MainWindow", "Turns off Voltage output", None))
self.powerOffButton.setText(_translate("MainWindow", "Voltage Off", None))
self.powerButton.setToolTip(_translate("MainWindow", "Closes Voltage Output and shuts down GUI", None))
self.powerButton.setText(_translate("MainWindow", "Voltage Off and Exit", None))
self.label.setText(_translate("MainWindow", "Command Input", None))
self.label_2.setText(_translate("MainWindow", "Command Output", None))
主线程是唯一应该更新 GUI 的线程，如果你想从另一个线程更新视图的任何部分，你必须使用信号，在你的情况下：
class MyForm(QtGui.QMainWindow):
signal = QtCore.pyqtSignal(str)
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.signal.connect(self.ui.commandOutput.insertPlainText)
[...]
def autoRun(self):
[...]
def autoRunThread(self):
self.task1=threading.currentThread()
while getattr(self.task1,"run",True):
commands=powerSupply.setValuesFile()
data=powerSupply.readValues()
self.signal.emit(str(data))
time.sleep(self.waitTime)
我正在尝试让一行文本显示在 pyqt4 文本浏览器中。我能够让它显示，但每当我开始调整 window 的大小时，我 运行 函数 PyQt window 关闭。目前，它只是关闭而没有显示错误或其他任何内容。在它显示此错误之前：
QObject::startTimer: timers cannot be started from another thread
我已经尝试了 .append() 和 .instertPlainText()。附加是我从中得到错误的地方。感谢您的帮助，如有不明之处请见谅。
这是我的代码：
class MyForm(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.stopAutoRun=0
self.ui.autoButton.clicked.connect(self.autoRun)
self.waitTime=.2
'''
________________________________________________________________________________
autoRun
Description: will continously look for a new JSON file and process it once it appears
_______________________________________________________
'''
def autoRun(self):
self.task1=threading.Thread(target=self.autoRunThread)
self.task1.setDaemon(True)
self.task1.start()
def autoRunThread(self):
self.task1=threading.currentThread()
while getattr(self.task1,"run",True):
commands=powerSupply.setValuesFile()
data=powerSupply.readValues()
self.ui.commandOutput.insertPlainText(str(data))
time.sleep(self.waitTime)
ui:
from PyQt4 import QtCore, QtGui
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_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(1270, 805)
MainWindow.setMinimumSize(QtCore.QSize(0, 0))
MainWindow.setMouseTracking(True)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.verticalLayout_3 = QtGui.QVBoxLayout(self.centralwidget)
self.verticalLayout_3.setObjectName(_fromUtf8("verticalLayout_3"))
spacerItem = QtGui.QSpacerItem(20, 40, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout_3.addItem(spacerItem)
self.gridLayout_3 = QtGui.QGridLayout()
self.gridLayout_3.setObjectName(_fromUtf8("gridLayout_3"))
self.verticalLayout = QtGui.QVBoxLayout()
self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
spacerItem1 = QtGui.QSpacerItem(20, 60, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem1)
self.openButton = QtGui.QPushButton(self.centralwidget)
self.openButton.setMinimumSize(QtCore.QSize(140, 28))
self.openButton.setMaximumSize(QtCore.QSize(140, 28))
self.openButton.setObjectName(_fromUtf8("openButton"))
self.verticalLayout.addWidget(self.openButton)
spacerItem2 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem2)
self.runButton = QtGui.QPushButton(self.centralwidget)
self.runButton.setMinimumSize(QtCore.QSize(140, 28))
self.runButton.setMaximumSize(QtCore.QSize(140, 28))
self.runButton.setObjectName(_fromUtf8("runButton"))
self.verticalLayout.addWidget(self.runButton)
spacerItem3 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem3)
self.autoButton = QtGui.QPushButton(self.centralwidget)
self.autoButton.setObjectName(_fromUtf8("autoButton"))
self.verticalLayout.addWidget(self.autoButton)
spacerItem4 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem4)
self.stopAutoButton = QtGui.QPushButton(self.centralwidget)
self.stopAutoButton.setObjectName(_fromUtf8("stopAutoButton"))
self.verticalLayout.addWidget(self.stopAutoButton)
spacerItem5 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem5)
self.outputButton = QtGui.QPushButton(self.centralwidget)
self.outputButton.setMinimumSize(QtCore.QSize(140, 28))
self.outputButton.setMaximumSize(QtCore.QSize(140, 28))
self.outputButton.setStyleSheet(_fromUtf8("\n"
""))
self.outputButton.setObjectName(_fromUtf8("outputButton"))
self.verticalLayout.addWidget(self.outputButton)
spacerItem6 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem6)
self.powerOffButton = QtGui.QPushButton(self.centralwidget)
self.powerOffButton.setStyleSheet(_fromUtf8("background-color: rgb(255, 0, 0);"))
self.powerOffButton.setObjectName(_fromUtf8("powerOffButton"))
self.verticalLayout.addWidget(self.powerOffButton)
spacerItem7 = QtGui.QSpacerItem(20, 10, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Preferred)
self.verticalLayout.addItem(spacerItem7)
self.powerButton = QtGui.QPushButton(self.centralwidget)
self.powerButton.setMinimumSize(QtCore.QSize(140, 28))
self.powerButton.setMaximumSize(QtCore.QSize(100, 28))
self.powerButton.setMouseTracking(True)
self.powerButton.setAcceptDrops(False)
self.powerButton.setStatusTip(_fromUtf8(""))
self.powerButton.setStyleSheet(_fromUtf8("background-color: rgb(255, 0, 0);"))
self.powerButton.setObjectName(_fromUtf8("powerButton"))
self.verticalLayout.addWidget(self.powerButton)
spacerItem8 = QtGui.QSpacerItem(20, 40, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Expanding)
self.verticalLayout.addItem(spacerItem8)
self.gridLayout_3.addLayout(self.verticalLayout, 0, 0, 1, 1)
self.horizontalLayout_2 = QtGui.QHBoxLayout()
self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2"))
self.verticalLayout_2 = QtGui.QVBoxLayout()
self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
self.label = QtGui.QLabel(self.centralwidget)
self.label.setObjectName(_fromUtf8("label"))
self.verticalLayout_2.addWidget(self.label)
self.commandInput = QtGui.QTextBrowser(self.centralwidget)
self.commandInput.setMinimumSize(QtCore.QSize(600, 300))
self.commandInput.setObjectName(_fromUtf8("commandInput"))
self.verticalLayout_2.addWidget(self.commandInput)
self.horizontalLayout_2.addLayout(self.verticalLayout_2)
self.gridLayout_3.addLayout(self.horizontalLayout_2, 0, 1, 1, 1)
self.verticalLayout_3.addLayout(self.gridLayout_3)
self.label_2 = QtGui.QLabel(self.centralwidget)
self.label_2.setObjectName(_fromUtf8("label_2"))
self.verticalLayout_3.addWidget(self.label_2)
self.commandOutput = QtGui.QTextBrowser(self.centralwidget)
self.commandOutput.setMaximumSize(QtCore.QSize(16777215, 100))
self.commandOutput.setObjectName(_fromUtf8("commandOutput"))
self.verticalLayout_3.addWidget(self.commandOutput)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 1270, 26))
self.menubar.setObjectName(_fromUtf8("menubar"))
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.openButton.setToolTip(_translate("MainWindow", "manually chose a JSON file to run", None))
self.openButton.setText(_translate("MainWindow", "Open File", None))
self.runButton.setToolTip(_translate("MainWindow", "runs the chosen JSON file", None))
self.runButton.setText(_translate("MainWindow", "Run File", None))
self.autoButton.setToolTip(_translate("MainWindow", "starts to automatically run new JSON files in directory", None))
self.autoButton.setText(_translate("MainWindow", "Auto Run", None))
self.stopAutoButton.setToolTip(_translate("MainWindow", "Stops the auto run funtion", None))
self.stopAutoButton.setText(_translate("MainWindow", "Stop Auto Run", None))
self.outputButton.setToolTip(_translate("MainWindow", "changes where the file is being stored during while this GUI instance is open", None))
self.outputButton.setText(_translate("MainWindow", "Change Output File", None))
self.powerOffButton.setToolTip(_translate("MainWindow", "Turns off Voltage output", None))
self.powerOffButton.setText(_translate("MainWindow", "Voltage Off", None))
self.powerButton.setToolTip(_translate("MainWindow", "Closes Voltage Output and shuts down GUI", None))
self.powerButton.setText(_translate("MainWindow", "Voltage Off and Exit", None))
self.label.setText(_translate("MainWindow", "Command Input", None))
self.label_2.setText(_translate("MainWindow", "Command Output", None))
主线程是唯一应该更新 GUI 的线程，如果你想从另一个线程更新视图的任何部分，你必须使用信号，在你的情况下：
class MyForm(QtGui.QMainWindow):
signal = QtCore.pyqtSignal(str)
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.signal.connect(self.ui.commandOutput.insertPlainText)
[...]
def autoRun(self):
[...]
def autoRunThread(self):
self.task1=threading.currentThread()
while getattr(self.task1,"run",True):
commands=powerSupply.setValuesFile()
data=powerSupply.readValues()
self.signal.emit(str(data))
time.sleep(self.waitTime)