Question

我使用QT来构建我的GUI，并使用装饰器来记录日志。当我在插槽上使用装饰器时，GUI会崩溃。

代码是：

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


def LogInfos(func):

    def wrapper(*s, **gs):
        print('log')
        ret = func(*s, **gs)
        return ret

    return wrapper
class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        layout = QHBoxLayout(self)
        btn = QPushButton('test')
        layout.addWidget(btn)
        btn.clicked.connect(self.testSlot)

    @LogInfos
    def testSlot(self):
        print('test slot')


@LogInfos
def testLog():
    print('test log')

if __name__ == '__main__':

    testLog()

    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

我已经测试过装饰器功能没问题，删除装饰器后GUI就可以了。

Answer 1

请参阅@ ekhumoro对原因的解释，但使用插槽中的修饰方法会因签名错误而导致问题。

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


def LogInfos(func):

    def wrapper(*s, **gs):
        print('log')
        ret = func(*s, **gs)
        return ret

    return wrapper
class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        layout = QHBoxLayout(self)
        btn = QPushButton('test')
        layout.addWidget(btn)
        btn.clicked.connect(self.testSlot)

    @LogInfos
    def testSlot(self, checked=False):
        print('test slot')


@LogInfos
def testLog():
    print('test log')

if __name__ == '__main__':

    testLog()

    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

Answer 2

试一试：btn.clicked.connect（lambda：self.testSlot（））

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


def LogInfos(func):

    def wrapper(*s, **gs):
        print('log')
        ret = func(*s, **gs)
        return ret

    return wrapper
class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        layout = QHBoxLayout(self)
        btn = QPushButton('test')
        layout.addWidget(btn)
        #btn.clicked.connect(self.testSlot)
        btn.clicked.connect(lambda: self.testSlot())         

    @LogInfos
    def testSlot(self):
        print('test slot')


@LogInfos
def testLog():
    print('test log')

if __name__ == '__main__':

    testLog()

    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

插槽上的装饰器（PyQt）

2 个答案: