我有一個對象的數據庫,您可以在列表框中查看數據庫中的項目,並且有一個按鈕可以刪除項目並創建項目。打開項目類的對話窗口,然後將項目的數據存儲在數據庫中。我通過非常簡單的設置複製了該問題(請參閱下面的代碼)。tkinter listbox插入錯誤「無效的命令名」.50054760.50055432「
每當我添加一個新的項,添加成功(下次打開數據庫對話框),但列表框不插入項目,並且當我關閉數據庫對話框時,出現以下錯誤:
Exception in Tkinter callback Traceback (most recent call last):
File "C:\Python33\lib\tkinter__init__.py", line 1442, in call return self.func(*args) File "", line 21, in addRecord File "C:\Python33\lib\tkinter__init__.py", line 2604, in insert self.tk.call((self._w, 'insert', index) + elements) _tkinter.TclError: invalid command name ".50054760.50055432"
如果我只是嘗試創建對象並填充其值而不調用其輸入GUI(這對於將事物插入到我的數據庫中是必需的),則不會出現同樣的問題。我在另一個線程中看到了類似的錯誤(對不起,但我似乎無法再找到它),問題出在多線程。我不知道我正在做什麼線程,不想下載另一個包來處理tkinter線程。有任何想法嗎?解決方法?如果有幫助,我正在使用Python v3.3和64位Windows 7。
這裏是我的簡單的數據庫代碼:
import tkinter
import traceback
# Test =========================================================================
class Test:
def __init__(self):
"""A database of objects' IDs and values."""
self.data = {1: 'a', 2: 'b', 3: 'c'}
#---------------------------------------------------------------------------
def addRecord(self):
"""Opens up a new item for editing and saves that ability to the
database."""
print('hi0')
newItem = OtherObject()
newItem.create(self.root)
print('hi1')
self.data[newItem.ID] = newItem.value
print('hi2')
self.listbox.insert(tkinter.END, self.formatItem(newItem.ID))
print('hi3')
#---------------------------------------------------------------------------
def delRecord(self):
"""Removes selected item from the database."""
try:
index = self.listbox.curselection()[0]
selection = self.listbox.get(index)
except:
return
ID = int(selection.split(':')[0])
self.data.pop(ID)
self.listbox.delete(index)
#---------------------------------------------------------------------------
def dataframe(self, master):
"""Assembles a tkinter frame with a scrollbar to view database objects.
(Returns Frame, Scrollbar widget, Listbox widget)
master: (Tk or Toplevel) tkinter master widget."""
frame = tkinter.Frame(master)
# scrollbar
scrollbar = tkinter.Scrollbar(frame)
scrollbar.pack(side=tkinter.LEFT, fill=tkinter.Y)
# listbox
listbox = tkinter.Listbox(frame, yscrollcommand=scrollbar.set)
listbox.pack(side=tkinter.LEFT, fill=tkinter.BOTH)
# fill listbox
for ID in self.data:
listbox.insert(tkinter.END, self.formatItem(ID))
return (frame, listbox, scrollbar)
#---------------------------------------------------------------------------
def destroyLB(self, e):
for line in traceback.format_stack():
print(line.strip())
#---------------------------------------------------------------------------
def formatItem(self, ID):
"""Creates a nice string representation of an item in the database."""
return '{0}:{1}'.format(ID, self.data[ID])
#---------------------------------------------------------------------------
def listboxSelect(self, e):
"""Manages events when the selection changes in the database interface.
e: (Event) tkinter event."""
try:
selection = self.listbox.get(self.listbox.curselection()[0])
except:
return
# set description label
ID = int(selection.split(':')[0])
self.lblstr.set(self.data[ID])
#---------------------------------------------------------------------------
def view(self):
"""Displays database interface."""
self.root = tkinter.Tk()
# listbox frame
self.frame, self.listbox, self.scrollbar = self.dataframe(self.root)
self.frame.grid(column=0, row=0)
self.listbox.bind('<<ListboxSelect>>', self.listboxSelect)
self.listbox.bind('<Destroy>', self.destroyLB)
# record display frame
self.lblstr = tkinter.StringVar()
self.lbl = tkinter.Label(self.root, textvariable=self.lblstr)
self.lbl.grid(column=1, row=0, sticky=tkinter.N)
# buttons frame
self.frame_btn = tkinter.Frame(self.root)
self.frame_btn.grid(row=1, columnspan=2, sticky=tkinter.E+tkinter.W)
# 'create new' button
self.btn_new = tkinter.Button(
self.frame_btn, text='+', command=self.addRecord)
self.btn_new.grid(row=0, column=0)
# 'delete record' button
self.btn_del = tkinter.Button(
self.frame_btn, text='-', command=self.delRecord)
self.btn_del.grid(row=0, column=1)
# display
self.root.mainloop()
# Test =========================================================================
# OtherObject ==================================================================
class OtherObject:
"""An object with an ID and value."""
def __init__ (self):
self.ID = 0
self.value = ''
#---------------------------------------------------------------------------
def create(self, master=None):
"""open a dialog for the user to entry a new object ID and value.
master: (Tk or Toplevel) tkinter master widget."""
self.stuff = tkinter.Toplevel(master)
# ID
tkinter.Label(self.stuff, text='ID: ').grid(row=0, column=0)
self.IDvar = tkinter.StringVar(self.stuff)
self.IDvar.set(self.ID)
IDwidget = tkinter.Entry(self.stuff, textvariable=self.IDvar)
IDwidget.grid(row=0, column=1)
# value
tkinter.Label(self.stuff, text='Value: ').grid(row=1, column=0)
self.valueVar = tkinter.StringVar(self.stuff)
self.valueVar.set(self.value)
valueWidget = tkinter.Entry(self.stuff, textvariable=self.valueVar)
valueWidget.grid(row=1, column=1)
# OK button
tkinter.Button(self.stuff, text='OK', command=self.OK).grid(row=2)
self.stuff.mainloop()
#---------------------------------------------------------------------------
def OK(self):
try: self.ID = int(self.IDvar.get())
except: self.ID = 0
self.value = self.valueVar.get()
self.stuff.destroy()
# OtherObject ==================================================================
在此先感謝
我只是嘗試將OtherObject更改爲Toplevel(在這個笨拙的代碼和我的主代碼中),它顯示/像以前一樣工作,但我仍然有同樣的問題和錯誤。我也試圖讓測試中的一個(「主」窗口)也是一個Toplevel小部件,這給了我同樣的錯誤,但也打開了一個我在開始時並不需要的額外窗口。 – Breez 2013-04-20 16:59:52
我只是再次嘗試,將我的主「根」小部件(使其成爲self.root)傳遞給OtherObject,並使OtherObject的Toplevel小部件使用Test的根作爲它的主。現在它在同一位置(列表框)給我一個錯誤,但是出現以下錯誤: _tkinter.TclError:invalid command name「.49660480。48661896「 – Breez 2013-04-20 18:01:54
@Breez:在mainloop存在後的任何代碼都無法訪問任何與Tkinter(小部件,StringVars,IntVars等)有關的任何東西,因爲那時所有的Tkinter對象都將被銷燬。 – 2013-04-20 19:16:34