python - PySide 发出信号导致 python 崩溃

Question

我正在阅读“Rapid Gui Programming with Python and Qt”一书，但在信号/槽项目上遇到了问题。我已经下载了作者的代码与我自己的代码进行比较，它们看起来都一样，但是，当我从派生的旋转框类发出信号时，python 就崩溃了。这是我的全部代码:

import sys
from PySide.QtCore import *
from PySide.QtGui import *

class ZeroSpinBox(QSpinBox):
    zeros = 0

    def __init__(self, parent=None):
        super(ZeroSpinBox, self).__init__(parent)
        self.connect(self, SIGNAL("valueChanged(int)"), self.checkzero)

    def checkzero(self):
        if self.value() == 0:
            self.zeros += 1
            self.emit(SIGNAL("atzero"), self.zeros)

class Form(QDialog):
    def __init__(self, parent= None):
        super(Form, self).__init__(parent)

        dial = QDial()
        dial.setNotchesVisible(True)
        spinbox = ZeroSpinBox()
        spinbox.setRange(0,200)
        dial.setRange(0,200)

        layout = QHBoxLayout()
        layout.addWidget(dial)
        layout.addWidget(spinbox)
        self.setLayout(layout)

        self.connect(dial, SIGNAL("valueChanged(int)"), spinbox, SLOT("setValue(int)"))
        self.connect(spinbox, SIGNAL("valueChanged(int)"), dial, SLOT("setValue(int)"))
        self.connect(spinbox, SIGNAL("atzero"), self.announce)

        self.setWindowTitle("Signals and Slots Part 2")

    def announce(self, zeros):
        print "ZeroSpinBox has been at zero %d times" % zeros


if __name__ == "__main__":
    app = QApplication(sys.argv)
    form = Form()
    form.show()
    app.exec_()

当旋转框降为零时，我的问题出现了，checkzero(self) 方法(属于 ZeroSpinBox 类)被调用，self.zeros += 1 行正常，然后在发射行上 windows 报告 Python. exe崩溃了。我得到的错误是“python.exe 已停止工作”并且控制台报告“进程已完成，退出代码为 -1073741819”

知道为什么会这样吗？这是带有 PySide 的 Python 2.7.2 和 PyQT4。

Answer 1

在 checkzero 和 Form 中用 SIGNAL("atzero(int)") 替换 SIGNAL("atzero") .__init__，因为您声明它的方式不包含任何参数。

编辑:“新式”中的代码，

import sys
from PySide.QtCore import *
from PySide.QtGui import *

class ZeroSpinBox(QSpinBox):
    zeros = 0

    def __init__(self, parent=None):
        super(ZeroSpinBox, self).__init__(parent)
        self.valueChanged.connect(self.checkzero)

    atzero = Signal(int)

    def checkzero(self):
        if self.value() == 0:
            self.zeros += 1
            self.atzero.emit(self.zeros)

class Form(QDialog):
    def __init__(self, parent= None):
        super(Form, self).__init__(parent)

        dial = QDial()
        dial.setNotchesVisible(True)
        spinbox = ZeroSpinBox()
        spinbox.setRange(0,200)
        dial.setRange(0,200)

        layout = QHBoxLayout()
        layout.addWidget(dial)
        layout.addWidget(spinbox)
        self.setLayout(layout)

        dial.valueChanged.connect(spinbox.setValue)
        spinbox.valueChanged.connect(dial.setValue)
        spinbox.atzero.connect(self.announce)

        self.setWindowTitle("Signals and Slots Part 2")

    @Slot(int)
    def announce(self, zeros):
        print "ZeroSpinBox has been at zero %d times" % zeros


if __name__ == "__main__":
    app = QApplication(sys.argv)
    form = Form()
    form.show()
    app.exec_()