PySide 发出信号导致 python 崩溃 [英] PySide emit signal causes python to crash

问题描述

我正在阅读使用 Python 和 Qt 进行快速 GUI 编程"这本书，并且在信号/插槽项目上遇到了问题.我已经下载了作者的代码来与我自己的代码进行比较，看起来都一样，但是，当我从派生的旋转框类发出信号时，python 只是崩溃了.这是我拥有的完整代码:

I am working through the book "Rapid Gui Programming with Python and Qt" and am having a problem on the signals/slots project. I have downloaded the authors code to compare against my own, and it all looks the same, however, when I emit a signal from a derived spin box class, python just crashes. Here is the entire code that I have:

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_()

我的问题发生在 spinbox 归零时，调用 checkzero(self) 方法(ZeroSpinBox 类的)，self.zeros += 1 行是好的，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"，控制台报告进程已完成，退出代码为 -1073741819"

My problem occurs when the spinbox goes down to zero, the checkzero(self) method (of the ZeroSpinBox class) gets called, the self.zeros += 1 line is ok, then on the emit line windows reports that Python.exe has crashed. The error I get is "python.exe has stopped working" and the console reports "Process finished with exit code -1073741819"

知道为什么会这样吗?这是 Python 2.7.2 和 PyQT4 w/PySide.

Any idea why this is happening? This is Python 2.7.2 and PyQT4 w/PySide.

推荐答案

Substitute SIGNAL("atzero") with SIGNAL("atzero(int)")checkzero 和在 Form.__init__ 中，因为你声明它的方式，它没有参数.

Substitute SIGNAL("atzero") with SIGNAL("atzero(int)") both in checkzero and in Form.__init__, because the way you're declaring it, it carries no argument.

您在新式"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_()

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