Question

我正在尝试在Python中为一个学校项目组建一个gui，但我收到一个错误并且不明白为什么。

self.prompt.addAnswer（i，self.ansControls [i] .GetValue（））文件 “C：\ Python27 \ lib \ site-packages \ wx-3.0-msw \ _wx_core.py”，第16712行，的 GETATTR raise PyDeadObjectError（self.attrStr％self._name）wx._core.PyDeadObjectError：TextCtrl对象的C ++部分有已删除，不再允许属性访问。

我理解错误的含义，TextCtrl对象不再存在，所以我无法访问它。我不明白为什么TextCtrl对象不再存在。流程如下：

框架显示标签，TextCtrls和按钮。用户输入数据并点击下一步。一切顺利。然后创建相同PromptFrame类的不同实例，并发生相同的事情。然而，这次，当用户点击下一个时，我得到上述错误。这是代码：

运行show的后台服务：

class AppService(object):

    prompts = [Prompt_1, Prompt_2, Prompt_3, Prompt_4, Prompt_5, Prompt_6, Prompt_7,
            Prompt_8, Prompt_9, Prompt_10, Prompt_11, Prompt_12, Prompt_13, Prompt_14,
             Prompt_15, Prompt_16, Prompt_17, Prompt_18, Prompt_19]

    skippedPromptIndices = []

    def __init__(self):
        print "Service Started"
        PromptFrame(self, self.prompts[0], 0, len(self.prompts))

    def doBack(self, curIndex, curPrompt):
        if curIndex >= 0:
            self.prompts[curIndex] = curPrompt
            PromptFrame(self, self.prompts[curIndex - 1], curIndex - 1, len(self.prompts))
        else:
            posCurIndex = (curIndex * -1) - 1
            self.prompts[posCurIndex] = curPrompt

            backIndex = self.skippedPromptIndices.index(curIndex) - 1
            nextPromptIndex = 0
            if backIndex < 0:
                nextPromptIndex = len(self.prompts) - 1
            else:
                nextPromptIndex = self.skippedPromptIndices[backIndex]

            PromptFrame(self, self.prompts[(nextPromptIndex * -1) - 1], nextPromptIndex, len(self.prompts))

    def doSkip(self, curIndex, curPrompt):
        skipIndex = (curIndex + 1) * -1
        if self.skippedPromptIndices.count(skipIndex) > 0:
            self.skippedPromptIndices.remove(skipIndex)

        self.skippedPromptIndices.append(skipIndex)
        self.doNext(curIndex, curPrompt)

    def doNext(self, curIndex, curPrompt):
        if curIndex >= 0:
            self.prompts[curIndex] = curPrompt
        else:
            self.prompts[(curIndex * -1) - 1] = curPrompt


        if (curIndex >= 0 and curIndex < (len(self.prompts) - 1)):
            PromptFrame(self, self.prompts[curIndex + 1], curIndex + 1, len(self.prompts))
        elif len(self.skippedPromptIndices) > 0:
            skipIndex = self.skippedPromptIndices.pop(0)
            nextIndex = (skipIndex * -1) - 1
            PromptFrame(self, self.prompts[nextIndex], skipIndex, len(self.prompts))
        else:
            dlg = wx.MessageDialog(self, "Done!", "Message", wx.OK)
            dlg.ShowModal() # Shows it
            dlg.Destroy() # finally destroy it when finished.

这是PromptFrame类：

class PromptFrame(wx.Frame):

    appService = None
    prompt = None
    promptIndex = 0
    numPrompts = 0
    ansControls = []

    def __init__(self, appService, prompt=testPrompt, promptIndex=0, numPrompts=0):
        print "New Prompt Frame!"
        self.appService = appService
        self.prompt = prompt
        self.promptIndex = promptIndex
        self.numPrompts = numPrompts

        wx.Frame.__init__(self, None, wx.ID_ANY, title=prompt.title)
        self.panel = wx.Panel(self, wx.ID_ANY)
        self.panel.SetBackgroundColour('#2FC0E0') #0013E3, #66DFFA, #2FC0E0
        self.Maximize()
        self.CreateStatusBar() # A Statusbar in the bottom of the window


        # Setting up the menu.
        filemenu= wx.Menu()
        menuAbout= filemenu.Append(wx.ID_ABOUT, "&About"," Information about this program")
        menuExit = filemenu.Append(wx.ID_EXIT,"E&xit"," Terminate the program")

        # Creating the menubar.
        menuBar = wx.MenuBar()
        menuBar.Append(filemenu,"&File") # Adding the "filemenu" to the MenuBar
        self.SetMenuBar(menuBar)  # Adding the MenuBar to the Frame content.

        # Creating fonts for the controls
        titleFont = wx.Font(24, wx.DECORATIVE, wx.ITALIC, wx.BOLD)
        qFont = wx.Font(12, wx.FONTFAMILY_DECORATIVE, wx.FONTSTYLE_NORMAL, wx.FONTWEIGHT_NORMAL)

        #Creating layout
        vertSizer = wx.BoxSizer(wx.VERTICAL)

        lblTitle = wx.StaticText(self.panel, wx.ID_ANY, prompt.title)
        lblTitle.SetFont(titleFont)

        vertSizer.Add(lblTitle, 0, wx.ALIGN_CENTER | wx.TOP, border=30)
        vertSizer.Add(wx.StaticLine(self.panel, wx.ID_ANY), 0, wx.EXPAND)
        vertSizer.AddStretchSpacer(2)

        for i in range(len(prompt.questions)):
            if prompt.qTypes[i] == 0:
                lbl = wx.StaticText(self.panel, wx.ID_ANY, prompt.questions[i], size=(200, -1))
                lbl.SetFont(qFont)
                lbl.Wrap(200)                                    
                ans = wx.TextCtrl(self.panel, wx.ID_ANY, size=(200,-1))
                if not prompt.answers[i] == None:
                    ans.SetValue(prompt.answers[i])
                self.ansControls.append(ans)

                horizSizer = wx.BoxSizer(wx.HORIZONTAL)
                horizSizer.Add((30, -1), 0)
                horizSizer.Add(lbl, 0)
                horizSizer.Add((20, -1), 0)
                horizSizer.Add(self.ansControls[len(self.ansControls) - 1], 0)

                vertSizer.Add(horizSizer, 0)
                vertSizer.AddStretchSpacer(1)

        print self.ansControls

        vertSizer.Add(wx.StaticLine(self.panel, wx.ID_ANY), 0, wx.EXPAND)

        self.btnBack = wx.Button(self.panel, wx.ID_ANY, "Back")
        self.btnSkip = wx.Button(self.panel, wx.ID_ANY, "Skip")
        self.btnNext = wx.Button(self.panel, wx.ID_ANY, "Next")

        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        btnSizer.Add(self.btnBack, 0, wx.RIGHT, border=30)
        btnSizer.Add(self.btnSkip, 0)
        btnSizer.Add(self.btnNext, 0, wx.LEFT, border=30)
        btnSizer.AddStretchSpacer(1)

        vertSizer.AddStretchSpacer(2)
        vertSizer.Add(btnSizer, 0, wx.ALIGN_CENTER)        
        vertSizer.AddStretchSpacer(2)

        lblPage = wx.StaticText(self.panel, wx.ID_ANY, "Page: " + str(self.promptIndex) + "/" + str(self.numPrompts))
        vertSizer.Add(lblPage, 0, wx.ALIGN_BOTTOM | wx.ALIGN_RIGHT | wx.ALL, border=20)

        self.panel.SetSizer(vertSizer)

        # Events.
        self.Bind(wx.EVT_MENU, self.OnExit, menuExit)
        self.Bind(wx.EVT_MENU, self.OnAbout, menuAbout)
        self.Bind(wx.EVT_BUTTON, self.OnBack, self.btnBack)
        self.Bind(wx.EVT_BUTTON, self.OnSkip, self.btnSkip)
        self.Bind(wx.EVT_BUTTON, self.OnNext, self.btnNext)

        self.Show()

    def OnAbout(self,e):
        # Create a message dialog box
        aboutString = "This program was designed by students of Worcester Polytechnic Institute to aid water supply " \
                  "officials apply the World Health Organization's Water Safety Plans."
        dlg = wx.MessageDialog(self, aboutString, "About Water Safety Plan Helper", wx.OK)
        dlg.ShowModal() # Shows it
        dlg.Destroy() # finally destroy it when finished.

    def OnExit(self,e):
        self.Close(True)  # Close the frame.

    def OnBack(self, e):
        if (self.promptIndex > 0):
            self.SaveAns()
            self.appService.doBack(self.promptIndex, self.prompt)
            self.Close(True)
        else:
            errorString = "There are no previous pages to go back to"
            dlg = wx.MessageDialog(self, errorString, "Error", wx.OK)
            dlg.ShowModal() # Shows it
            dlg.Destroy() # finally destroy it when finished.

    def OnSkip(self, e):
        self.SaveAns()
        self.appService.doSkip(self.promptIndex, self.prompt)
        self.Close(True)

    def OnNext(self, e):
        self.SaveAns()
        self.appService.doNext(self.promptIndex, self.prompt)
        self.Close(True)

    def SaveAns(self):
        print self.ansControls
        for i in range(len(self.ansControls)):
            if self.prompt.qTypes[i] == 0:
                self.prompt.addAnswer(i, self.ansControls[i].GetValue())

感谢您的帮助！

编辑：这是我的 init .py文件：

from MainFrame import MainFrame
import wx

app = wx.App(False)
frame = MainFrame(None, "My App")
app.MainLoop()

Answer 1

ansControls目前被定义为类变量。这意味着任何窗口中定义的任何控件都会添加到其中。

您在第一个实例中创建一个控件，它被添加到类中，但该窗口属于该实例。因此，当您销毁该类时，实例将被销毁，但指向它的python对象仍然存在。

然后打开第二个窗口，添加更多控件，然后点击循环它们的循环。循环中的第一个将不再有一个有效的C ++对象，它将失败。

不确定为什么将它们定义为类变量，但是您需要保留指向根窗口的指针，删除父控件时删除类控件，或者（更简单）只需要使ansControls成为实例变量而不是类变量...

正在删除WxPython C ++部分的TextCtrl

1 个答案: