每次发送事件信号两次

Question

我正在开发GUI应用程序。从主窗口打开新的弹出窗口Dialog = myDialog（） （因此两者都打开）。如果我按新的弹出窗口上的按钮，捕捉信号，此代码：

class Ui_DialogCalibration(object): 
def setupUi(self, DialogCalibration): 
    DialogCalibration.setObjectName(_fromUtf8("DialogCalibration")) 
    DialogCalibration.resize(888, 378) 
    self.widget = QtGui.QWidget(DialogCalibration) 
    self.widget.setGeometry(QtCore.QRect(10, 150, 641, 144)) 
    self.widget.setObjectName(_fromUtf8("widget")) 
    self.horizontalLayout_5 = QtGui.QHBoxLayout(self.widget) 
    self.horizontalLayout_5.setMargin(0) 
    self.horizontalLayout_5.setObjectName(_fromUtf8("horizontalLayout_5")) 
    self.radioButtonManual = QtGui.QRadioButton(self.widget) 
    self.radioButtonManual.setObjectName(_fromUtf8("radioButtonManual")) 
    self.horizontalLayout_5.addWidget(self.radioButtonManual) 
    self.verticalLayout = QtGui.QVBoxLayout() 
    self.verticalLayout.setObjectName(_fromUtf8("verticalLayout")) 
    self.horizontalLayout_4 = QtGui.QHBoxLayout() 
    self.horizontalLayout_4.setObjectName(_fromUtf8("horizontalLayout_4")) 
    self.verticalLayout_4 = QtGui.QVBoxLayout() 
    self.verticalLayout_4.setObjectName(_fromUtf8("verticalLayout_4")) 
    self.pushButtonDesnoX = QtGui.QPushButton(self.widget) 
    self.pushButtonDesnoX.setObjectName(_fromUtf8("pushButtonDesnoX")) 
    self.verticalLayout_4.addWidget(self.pushButtonDesnoX) 
    self.lineEdit = QtGui.QLineEdit(self.widget) 
    self.lineEdit.setText(_fromUtf8("")) 
    self.lineEdit.setObjectName(_fromUtf8("lineEdit")) 
    self.verticalLayout_4.addWidget(self.lineEdit) 
    self.pushButtonLijevoX = QtGui.QPushButton(self.widget) 
    self.pushButtonLijevoX.setObjectName(_fromUtf8("pushButtonLijevoX")) 
    self.verticalLayout_4.addWidget(self.pushButtonLijevoX) 
    self.horizontalLayout_4.addLayout(self.verticalLayout_4) 
    self.verticalLayout_3 = QtGui.QVBoxLayout() 
    self.verticalLayout_3.setObjectName(_fromUtf8("verticalLayout_3")) 
    self.pushButtonDesnoY = QtGui.QPushButton(self.widget) 
    self.pushButtonDesnoY.setObjectName(_fromUtf8("pushButtonDesnoY")) 
    self.verticalLayout_3.addWidget(self.pushButtonDesnoY) 
    self.lineEdit_2 = QtGui.QLineEdit(self.widget) 
    self.lineEdit_2.setText(_fromUtf8("")) 
    self.lineEdit_2.setObjectName(_fromUtf8("lineEdit_2")) 
    self.verticalLayout_3.addWidget(self.lineEdit_2) 
    self.pushButtonLijevoY = QtGui.QPushButton(self.widget) 
    self.pushButtonLijevoY.setObjectName(_fromUtf8("pushButtonLijevoY")) 
    self.verticalLayout_3.addWidget(self.pushButtonLijevoY) 
    self.horizontalLayout_4.addLayout(self.verticalLayout_3) 
    self.verticalLayout_2 = QtGui.QVBoxLayout() 
    self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2")) 
    self.pushButtonDesnoZ = QtGui.QPushButton(self.widget) 
    self.pushButtonDesnoZ.setObjectName(_fromUtf8("pushButtonDesnoZ")) 
    self.verticalLayout_2.addWidget(self.pushButtonDesnoZ) 
    self.lineEdit_3 = QtGui.QLineEdit(self.widget) 
    self.lineEdit_3.setText(_fromUtf8("")) 
    self.lineEdit_3.setObjectName(_fromUtf8("lineEdit_3")) 
    self.verticalLayout_2.addWidget(self.lineEdit_3) 
    self.pushButtoLijevoZ = QtGui.QPushButton(self.widget) 
    self.pushButtoLijevoZ.setObjectName(_fromUtf8("pushButtoLijevoZ")) 
    self.verticalLayout_2.addWidget(self.pushButtoLijevoZ) 
    self.horizontalLayout_4.addLayout(self.verticalLayout_2) 
    self.verticalLayout.addLayout(self.horizontalLayout_4) 
    self.pushButtonSondaSettings = QtGui.QPushButton(self.widget) 
    self.pushButtonSondaSettings.setObjectName(_fromUtf8("pushButtonSondaSettings")) 
    self.verticalLayout.addWidget(self.pushButtonSondaSettings) 
    self.pushButtonReset = QtGui.QPushButton(self.widget) 
    self.pushButtonReset.setObjectName(_fromUtf8("pushButtonReset")) 
    self.verticalLayout.addWidget(self.pushButtonReset) 
    self.horizontalLayout_5.addLayout(self.verticalLayout) 
    self.verticalLayout_5 = QtGui.QVBoxLayout() 
    self.verticalLayout_5.setObjectName(_fromUtf8("verticalLayout_5")) 
    self.labelPozition = QtGui.QLabel(self.widget) 
    self.labelPozition.setObjectName(_fromUtf8("labelPozition")) 
    self.verticalLayout_5.addWidget(self.labelPozition) 
    self.horizontalLayout = QtGui.QHBoxLayout() 
    self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout")) 
    self.labelpozitionX = QtGui.QLabel(self.widget) 
    self.labelpozitionX.setObjectName(_fromUtf8("labelpozitionX")) 
    self.horizontalLayout.addWidget(self.labelpozitionX) 
    self.lineEditPozitionX = QtGui.QLineEdit(self.widget) 
    self.lineEditPozitionX.setObjectName(_fromUtf8("lineEditPozitionX")) 
    self.horizontalLayout.addWidget(self.lineEditPozitionX) 
    self.verticalLayout_5.addLayout(self.horizontalLayout) 
    self.horizontalLayout_2 = QtGui.QHBoxLayout() 
    self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2")) 
    self.labelPozitionY = QtGui.QLabel(self.widget) 
    self.labelPozitionY.setObjectName(_fromUtf8("labelPozitionY")) 
    self.horizontalLayout_2.addWidget(self.labelPozitionY) 
    self.lineEditPozitionY = QtGui.QLineEdit(self.widget) 
    self.lineEditPozitionY.setObjectName(_fromUtf8("lineEditPozitionY")) 
    self.horizontalLayout_2.addWidget(self.lineEditPozitionY) 
    self.verticalLayout_5.addLayout(self.horizontalLayout_2) 
    self.horizontalLayout_3 = QtGui.QHBoxLayout() 
    self.horizontalLayout_3.setObjectName(_fromUtf8("horizontalLayout_3")) 
    self.labelPozitionZ = QtGui.QLabel(self.widget) 
    self.labelPozitionZ.setObjectName(_fromUtf8("labelPozitionZ")) 
    self.horizontalLayout_3.addWidget(self.labelPozitionZ) 
    self.lineEditPozitionZ = QtGui.QLineEdit(self.widget) 
    self.lineEditPozitionZ.setObjectName(_fromUtf8("lineEditPozitionZ")) 
    self.horizontalLayout_3.addWidget(self.lineEditPozitionZ) 
    self.verticalLayout_5.addLayout(self.horizontalLayout_3) 
    self.horizontalLayout_5.addLayout(self.verticalLayout_5) 
    self.widget1 = QtGui.QWidget(DialogCalibration) 
    self.widget1.setGeometry(QtCore.QRect(20, 40, 631, 91)) 
    self.widget1.setObjectName(_fromUtf8("widget1")) 
    self.verticalLayout_6 = QtGui.QVBoxLayout(self.widget1) 
    self.verticalLayout_6.setMargin(0) 
    self.verticalLayout_6.setObjectName(_fromUtf8("verticalLayout_6")) 
    self.radioButtonAutomatic = QtGui.QRadioButton(self.widget1) 
    self.radioButtonAutomatic.setObjectName(_fromUtf8("radioButtonAutomatic")) 
    self.verticalLayout_6.addWidget(self.radioButtonAutomatic) 
    self.buttonBox = QtGui.QDialogButtonBox(self.widget1) 
    self.buttonBox.setOrientation(QtCore.Qt.Horizontal) 
    self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok) 
    self.buttonBox.setObjectName(_fromUtf8("buttonBox")) 
    self.verticalLayout_6.addWidget(self.buttonBox) 
    self.labelpozitionX.setBuddy(self.lineEditPozitionX) 
    self.labelPozitionY.setBuddy(self.lineEditPozitionY) 
    self.labelPozitionZ.setBuddy(self.lineEditPozitionZ) 
    self.radioButtonManual.toggle() 
    self.buttonBox.setEnabled(False) 
    self.pushButtonDesnoX.setEnabled(False) 
    self.pushButtonDesnoY.setEnabled(False) 
    self.pushButtonDesnoZ.setEnabled(False) 
    self.pushButtonLijevoX.setEnabled(False) 
    self.pushButtonLijevoY.setEnabled(False) 
    self.pushButtoLijevoZ.setEnabled(False) 
    self.pushButtonReset.setEnabled(False) 
    self.lineEdit.setText("1") 
    self.lineEdit_2.setText("1") 
    self.lineEdit_3.setText("1") 
    self.X=None 
    self.Y=None 
    self.Z=None 

    self.retranslateUi(DialogCalibration) 
    QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("accepted()")), DialogCalibration.accept) 
    QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("rejected()")), DialogCalibration.reject) 
    QtCore.QMetaObject.connectSlotsByName(DialogCalibration) 

class myDialog(QtGui.QDialog,Ui_DialogCalibration): 
def __init__(self,sonda, parent=None): 
    super(myDialog, self).__init__(parent) 
    self.toupleSonda=sonda 
    self.setupUi(self) 
def on_pushButtonDesnoX_clicked(self): 

    value=int(self.lineEdit.text()) 
    self.X=self.X+value 
    print self.X 

def retranslateUi(self, DialogCalibration): 
    DialogCalibration.setWindowTitle(QtGui.QApplication.translate("DialogCalibration", "Calibration", None, QtGui.QApplication.UnicodeUTF8)) 
    self.radioButtonManual.setText(QtGui.QApplication.translate("DialogCalibration", "manual", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtonDesnoX.setText(QtGui.QApplication.translate("DialogCalibration", "Desno X", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtonLijevoX.setText(QtGui.QApplication.translate("DialogCalibration", "Lijevo X", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtonDesnoY.setText(QtGui.QApplication.translate("DialogCalibration", "Naprijed Y", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtonLijevoY.setText(QtGui.QApplication.translate("DialogCalibration", "Nazad Y", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtonDesnoZ.setText(QtGui.QApplication.translate("DialogCalibration", "Gore Z", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtoLijevoZ.setText(QtGui.QApplication.translate("DialogCalibration", "Dolje Z", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtonSondaSettings.setText(QtGui.QApplication.translate("DialogCalibration", "Load", None, QtGui.QApplication.UnicodeUTF8)) 
    self.pushButtonReset.setText(QtGui.QApplication.translate("DialogCalibration", "Reset", None, QtGui.QApplication.UnicodeUTF8)) 
    self.labelPozition.setText(QtGui.QApplication.translate("DialogCalibration", "Current pozition", None, QtGui.QApplication.UnicodeUTF8)) 
    self.labelpozitionX.setText(QtGui.QApplication.translate("DialogCalibration", "X", None, QtGui.QApplication.UnicodeUTF8)) 
    self.labelPozitionY.setText(QtGui.QApplication.translate("DialogCalibration", "Y", None, QtGui.QApplication.UnicodeUTF8)) 
    self.labelPozitionZ.setText(QtGui.QApplication.translate("DialogCalibration", "Z", None, QtGui.QApplication.UnicodeUTF8)) 
    self.radioButtonAutomatic.setText(QtGui.QApplication.translate("DialogCalibration", "automatic", None, QtGui.QApplication.UnicodeUTF8)) 

我得到这个oouput

因此，已执行此方法两次。我该如何解决这个问题？ 同样发生在emmitted上弹出窗口

Answer 1

从docs引用每隔一个信号：

[连接信号的两个变型]还与采取可选参数信号发生。 Qt 使用多个信号实现此功能。例如， QtGui.QAbstractButton具有以下信号：

void clicked(bool checked = false); 

Qt的实现此，如下所示：

void clicked(); 
void clicked(bool checked); 

的pyqtSlot()装饰可被用于指定哪一个信号 的应被连接到狭槽。

所以你的问题来自clicked信号QPushButton有两个过载的事实。由于Qt可以将信号连接到参数较少的插槽，因此connectSlotsByName可以成功将两个过载连接到您的插槽，因此每次点击都会调用插槽两次。

您需要通过pyqtSlot指定适当的过载：

@QtCore.pyqtSlot() # signal with no arguments 
def on_pushButtonDesnoX_clicked(self): 
    value=int(self.lineEdit.text()) 
    self.X=self.X+value 
    print self.X