Tix ComboBox会导致Python2.7崩溃

Question

我一直在使用tix来创建一个组合框，如果输入框留空，则会导致间歇性崩溃。

我是python的新手，非常新的gui编程，所以我一直在使用榜样来教授自己的东西。

当使用以下示例代码时，您应该能够在条目框中输入值，或者选择表单下拉菜单，但是如果您将条目字段留空并按Go，它将导致Python崩溃。

import Tix
import tkMessageBox

class App(object):
    def __init__(self, window):
        window.winfo_toplevel().wm_title("test")
        self.window = window

        self.combo = Tix.ComboBox(window)
        self.combo.insert(Tix.END, 'thing1')
        self.combo.insert(Tix.END, 'thing2')
        self.combo.entry['state'] = "normal"
        self.combo['editable'] = True
        self.combo.pack()

        button = Tix.Button(window)
        button['text'] = "Go"
        button['command'] = self.go
        button.pack()

    def go(self):
        tkMessageBox.showinfo('info', self.combo['selection'])

if __name__ == '__main__':
    root = Tix.Tk()
    App(root)
    root.mainloop()

.

========================= 崩溃细节：

  Problem signature:
  Problem Event Name:   APPCRASH
  Application Name: python2.7.exe
  Application Version:  0.0.0.0
  Application Timestamp:    4cfbf049
  Fault Module Name:    ntdll.dll
  Fault Module Version: 6.1.7600.16385
  Fault Module Timestamp:   4a5bdb3b
  Exception Code:   c0000005
  Exception Offset: 0002e23e
  OS Version:   6.1.7600.2.0.0.256.48
  Locale ID:    2057
  Additional Information 1: 0a9e
  Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
  Additional Information 3: 0a9e
  Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

.

所以

a]是一个例子是错误的吗？

b]有更好的方法吗？

c]我应该使用tix吗？

我注意到有些人似乎远离tix，只使用tkinter。是否有一个原因？我应该不使用tix吗？

++++++++++++++++++++++++++++

好的，所以我通过添加值=''来扫描它，因此返回字符串不为空，然后lip（）当我需要它时值。

self.combo = Tix.ComboBox(window, value =' ')
...
tkMessageBox.showinfo('info', self.combo['selection'].lstrip())

.

非常丑陋，但现在阻止我崩溃;直到有人更聪明地给我一个更好的答案。 如果用户删除了空间，然后按“GO”，它会再次导致崩溃！

Answer 1

I am not Tix expert, but this should fix the problem:

tkMessageBox.showinfo('info', self.combo.entry.get())

In between the lines, I would recommend using wxPython for learning GUI programming. It was great for me as a learning environment.

import wx

class MainWin(wx.Frame):
    def __init__(self, *args, **kwargs):
        wx.Frame.__init__(self, *args, **kwargs)

        self.combo = wx.ComboBox(self, choices=["Thing 1", "Thing 2"])      
        self.button = wx.Button(self, label="Go")
        self.button.Bind(wx.EVT_BUTTON, self.OnButton)

        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.combo, 0, wx.EXPAND)
        self.sizer.Add(self.button, 0, wx.EXPAND)
        self.SetSizerAndFit(self.sizer)     

        self.Show()

    def OnButton(self, e):
        wx.MessageBox(self.combo.GetValue())

app = wx.App(False)
main_win = MainWin(None)
app.MainLoop()