首页 \ 问答 \ 包装类型为QWidget的c / c ++对象已被删除(wrapped c/c++ object of type QWidget has been deleted)

包装类型为QWidget的c / c ++对象已被删除(wrapped c/c++ object of type QWidget has been deleted)

class window25(QtWidgets.QMainWindow):
    def __init__(self):
        try:
            super(window25,self).__init__()
            self.lineedit=QtWidgets.QLineEdit()
            self.checkbox=QtWidgets.QCheckBox()
            self.optBox=QtWidgets.QRadioButton()
            self.btn=QtWidgets.QPushButton("press me")
            self.guichange()
            self.btn.clicked.connect(self.guichange)
            self.show()
        except Exception as E:
            print(E)
    def guichange(self):
        try:
            wid=QtWidgets.QWidget()
    #        self.setCentralWidget()
            myLayout=QtWidgets.QVBoxLayout()
            myLayout.addWidget(self.btn)
            myLayout.addWidget(random.choice([self.lineedit,self.checkbox,self.optBox]))
            wid.setLayout(myLayout)    
            self.setCentralWidget(wid)
        except Exception as E:
            print(E)


app=QtWidgets.QApplication([])
ex=window25()
sys.exit(app.exec_())
 
 我试图做实验。虽然我知道QStackedWidget改变窗口，但我尝试了一些按下按钮的其他东西，随机更改mainWindow中央小部件。一些成功后（即按下按钮3,4次正确工作）“）但之后我得到了一个错误  
 
  包装类型QCheckBox的c / c ++对象已被删除  
  包装类型为QLineEdit的c / c ++对象已被删除  
 
 我无法理解哪条语句导致了这个错误，以及我为什么或者错在哪里 

class window25(QtWidgets.QMainWindow):
    def __init__(self):
        try:
            super(window25,self).__init__()
            self.lineedit=QtWidgets.QLineEdit()
            self.checkbox=QtWidgets.QCheckBox()
            self.optBox=QtWidgets.QRadioButton()
            self.btn=QtWidgets.QPushButton("press me")
            self.guichange()
            self.btn.clicked.connect(self.guichange)
            self.show()
        except Exception as E:
            print(E)
    def guichange(self):
        try:
            wid=QtWidgets.QWidget()
    #        self.setCentralWidget()
            myLayout=QtWidgets.QVBoxLayout()
            myLayout.addWidget(self.btn)
            myLayout.addWidget(random.choice([self.lineedit,self.checkbox,self.optBox]))
            wid.setLayout(myLayout)    
            self.setCentralWidget(wid)
        except Exception as E:
            print(E)


app=QtWidgets.QApplication([])
ex=window25()
sys.exit(app.exec_())
 
I was trying to do the experiment.Although I know about QStackedWidget to change windows but I tried something else that is pressing a button randomly changes the mainWindow Central widget.After a couple of success(i.e. pressing button 3,4 times work correctly") but after that I got an error 
 
 wrapped c/c++ object of type QCheckBox has been deleted 
 wrapped c/c++ object of type QLineEdit has been deleted 
 
i am unable to understand which statement caused this error and why or where I am wrong

原文：https://stackoverflow.com/questions/48125641

更新时间：2023-11-19 11:11

最满意答案

 有一个在您使用的CSV模块的README中生成CSV的示例：  
file = File.open!("test.csv", [:write, :utf8])
table_data |> CSV.encode |> Enum.each(&IO.write(file, &1))
 
 请注意， IO.write/2将字节写入设备，而IO.inspect/3 根据给定选项使用IO设备检查第二个参数 。 此外， CSV.encode/1需要二维列表 。  
 也就是说，您可能应该坚持使用IO.write/2中提到的IO.write/2 ，并在count生成一个2d列表而不是Map ：  
defp count(words) when is_list(words) do
  words
  |> Enum.reduce(%{}, &update_count/2)
  |> Enum.reduce([], fn {k, v}, acc -> [[k, v] | acc] end)
end

defp tocsv(map) do
  file = File.open!("test.csv", [:write, :utf8])

  map
  |> IO.inspect
  |> CSV.encode
  |> Enum.each(&IO.write(file, &1))
end
 
 
 在这种简单的情况下，我只是使用裸Elixir生成一个文件，但（假设count返回一个映射，就像在你的原始代码中一样）：  
defp tocsv(map) do
  File.open("test.csv", [:write, :utf8], fn(file) ->
    Enum.each(map, &IO.write(file, Enum.join(Tuple.to_list(&1), ?,) <> "\n"))
  end)
end
 
 
 或者更简单：  
defp tocsv(map) do
  File.write!("test.csv", 
     map
     |> Enum.map(Enum.join(Tuple.to_list(&1), ?,))
     |> Enum.join("\n"))
end

There is an example of producing the CSV in the README of the CSV module you use: 
file = File.open!("test.csv", [:write, :utf8])
table_data |> CSV.encode |> Enum.each(&IO.write(file, &1))
 
Please note, that IO.write/2 writes the bytes to the device, while IO.inspect/3 inspects the second argument according to the given options using the IO device. Also, CSV.encode/1 expects a two-dimensional list. 
That said, you probably should stick with IO.write/2 as mentioned in the example, and produce a 2d list in count rather that a Map: 
defp count(words) when is_list(words) do
  words
  |> Enum.reduce(%{}, &update_count/2)
  |> Enum.reduce([], fn {k, v}, acc -> [[k, v] | acc] end)
end

defp tocsv(map) do
  file = File.open!("test.csv", [:write, :utf8])

  map
  |> IO.inspect
  |> CSV.encode
  |> Enum.each(&IO.write(file, &1))
end
 
 
In such an simple case, I would just use bare Elixir to produce a file, though (assuming count returns a map, as in your original code): 
defp tocsv(map) do
  File.open("test.csv", [:write, :utf8], fn(file) ->
    Enum.each(map, &IO.write(file, Enum.join(Tuple.to_list(&1), ?,) <> "\n"))
  end)
end
 
 
Or, even simpler: 
defp tocsv(map) do
  File.write!("test.csv", 
     map
     |> Enum.map(Enum.join(Tuple.to_list(&1), ?,))
     |> Enum.join("\n"))
end

包装类型为QWidget的c / c ++对象已被删除(wrapped c/c++ object of type QWidget has been deleted)

最满意答案

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