Question

我正在尝试为学校制作一个简单的聊天窗口。当我尝试使用entry.get（）函数时，它会给出一个错误，每次测试代码时都会更改。这是脚本：

import socket
import sys
import tkinter

global ready
ready = False
def setready():
    global ready
    ready = True
window = tkinter.Tk()
window.title("MAGENTA Chat Host v1 - send")
window.geometry("200x100")
window.configure(bg = "magenta")
but = tkinter.Button(window, text = "Send", command = (setready()))
lbl = tkinter.Label(window, bg = "magenta", fg = "snow", text = "Chat")
msgfield = tkinter.Entry(window)
but.pack(side = tkinter.RIGHT)
lbl.pack(side = tkinter.TOP)
msgfield.pack(side = tkinter.LEFT)
message = "Message"
UDP_IP = "127.0.0.1"

try:
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    lbl.config(text = "Socket successfully created")
except socket.error as err:
    lbl.config(text = "Socket creation failed with error %s" %(err))

window.mainloop()

while True:
    if ready == True:
        message = msgfield.get()
        if message == "exit":
            s.close()
            window.destroy()
            sys.exit()
        else:
            s.sendto(bytes(message, "utf-8"),(UDP_IP,5000))
            msgfield.select_clear()
            ready = False

这是错误：

Traceback (most recent call last):
  File "C:\Users\qscguest\Desktop\ChatSend.py", line 33, in <module>
    message = msgfield.get()
  File "C:\Program Files\Python35\lib\tkinter\__init__.py", line 2522, in get
    return self.tk.call(self._w, 'get')
_tkinter.TclError: invalid command name ".55573472"

我怎么这么糟糕？我该如何解决这个问题？

Answer 1

在根窗口被销毁之前，

window.mainloop()不会退出。尝试引用窗口小部件之后的任何代码都将失败，因为窗口小部件已被销毁。

Answer 2

我认为你试图让你的tkinter应用程序关闭程序，当你输入exit并点击发送以及做其他功能，如果否则。我修改了你的代码来做我认为你正在尝试的事情。

我换了一些东西。

我摆脱了全局，因为我们可以在循环时将ready移动到定义的函数。

我更改了按钮以使用lambda运行命令myWhile()循环，因此启动时不会调用myWhile。

我添加了一个名为myWhile()的函数来容纳while循环并执行您需要完成的任务。如果这是您正在寻找的，请告诉我，因为我不能100％确定您的需求。

import socket
import sys
import tkinter

window = tkinter.Tk()
window.title("MAGENTA Chat Host v1 - send")
window.geometry("200x100")
window.configure(bg = "magenta")
but = tkinter.Button(window, text = "Send", command = lambda: myWhile())
lbl = tkinter.Label(window, bg = "magenta", fg = "snow", text = "Chat")
msgfield = tkinter.Entry(window)
but.pack(side = tkinter.RIGHT)
lbl.pack(side = tkinter.TOP)
msgfield.pack(side = tkinter.LEFT)
message = "Message"
UDP_IP = "127.0.0.1"

try:
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    lbl.config(text = "Socket successfully created")
except socket.error as err:
    lbl.config(text = "Socket creation failed with error %s" %(err))


def myWhile():
    ready = True
    while ready == True:
        message = msgfield.get()
        print ('ready')
        if message == "exit":
            s.close()
            window.destroy()
            sys.exit()
        else:
            s.sendto(bytes(message, "utf-8"),(UDP_IP,5000))
            msgfield.select_clear()
            ready = False

window.mainloop()

Entry.get（）给出错误，每次都不同。命令名无效.55

2 个答案: