5

花了一些时间重定向标准输出并将输出记录到 tkinter 文本小部件，我决定需要一些帮助。我的代码如下：

#!/usr/bin/env python
from Tkinter import *
import logging
from threading import Thread

class IODirector(object):
    def __init__(self,text_area):
        self.text_area = text_area

class StdoutDirector(IODirector):
    def write(self,str):
        self.text_area.insert(END,str)
    def flush(self):
        pass

class App(Frame):

    def __init__(self, master):
        self.master = master
        Frame.__init__(self,master,relief=SUNKEN,bd=2)
        self.start()

    def start(self):
        self.master.title("Test")
        self.submit = Button(self.master, text='Run', command=self.do_run, fg="red")
        self.submit.grid(row=1, column=2)
        self.text_area = Text(self.master,height=2.5,width=30,bg='light cyan')
        self.text_area.grid(row=1,column=1)

    def do_run(self):
        t = Thread(target=print_stuff)
        sys.stdout = StdoutDirector(self.text_area)
        t.start()

def print_stuff():
    logger = logging.getLogger('print_stuff')
    logger.info('This will not show')
    print 'This will show'
    print_some_other_stuff()

def print_some_other_stuff():
    logger = logging.getLogger('print_some_other_stuff')
    logger.info('This will also not show')
    print 'This will also show'

def main():    
    logger = logging.getLogger('main')
    root = Tk()
    app = App(root)
    root.mainloop() 

if __name__=='__main__':
    main()

我知道可以基于文本小部件定义一个新的日志记录处理程序，但我无法让它工作。函数“print_stuff”实际上只是许多不同函数的包装器，它们都有自己的记录器设置。我需要帮助定义一个“全局”的新日志处理程序，以便可以从每个具有自己的记录器的函数中实例化它。任何帮助深表感谢。

4

2 回答 2

5

只是为了确保我理解正确：

您希望将日志消息同时打印到 STDout 和 Tkinter 文本小部件，但日志不会在标准控制台中打印。

如果这确实是你的问题，这里是如何做到的。

首先让我们在 Tkinter 中制作一个非常简单的控制台，它实际上可以是任何文本小部件，但为了完整起见，我将其包括在内：

class LogDisplay(tk.LabelFrame):
"""A simple 'console' to place at the bottom of a Tkinter window """
    def __init__(self, root, **options):
        tk.LabelFrame.__init__(self, root, **options);

        "Console Text space"
        self.console = tk.Text(self, height=10)
        self.console.pack(fill=tk.BOTH)

现在让我们重写日志处理程序以重定向到参数中的控制台并仍然自动打印到 STDout：

class LoggingToGUI(logging.Handler):
""" Used to redirect logging output to the widget passed in parameters """
    def __init__(self, console):
        logging.Handler.__init__(self)

        self.console = console #Any text widget, you can use the class above or not

    def emit(self, message): # Overwrites the default handler's emit method
        formattedMessage = self.format(message)  #You can change the format here

        # Disabling states so no user can write in it
        self.console.configure(state=tk.NORMAL)
        self.console.insert(tk.END, formattedMessage) #Inserting the logger message in the widget
        self.console.configure(state=tk.DISABLED)
        self.console.see(tk.END)
        print(message) #You can just print to STDout in your overriden emit no need for black magic

希望能帮助到你。

于 2013-08-12T18:58:00.943 回答
3

这是一个完全修改后的答案，可以满足您的要求。我试图指出您问题中的哪些代码行已更改以及在何处添加了新行。

默认情况下，内置logger.StreamHandler处理程序类将消息输出到sys.stderr，因此要使它们也重定向sys.stdout文本小部件，需要构建一个新的记录器，并设置一个自定义控制台处理程序来执行此操作。由于您希望将其应用于模块中的所有记录器，因此需要将此设置应用于所有其他命名记录器将从其继承其设置的无名“根”记录器。

from Tkinter import *
import logging
from threading import Thread

class IODirector(object):
    def __init__(self, text_area):
        self.text_area = text_area

class StdoutDirector(IODirector):
    def write(self, msg):
        self.text_area.insert(END, msg)
    def flush(self):
        pass

class App(Frame):
    def __init__(self, master):
        self.master = master
        Frame.__init__(self, master, relief=SUNKEN, bd=2)
        self.start()

    def start(self):
        self.master.title("Test")
        self.submit = Button(self.master, text='Run', command=self.do_run, fg="red")
        self.submit.grid(row=1, column=2)
        self.text_area = Text(self.master, height=2.5, width=30, bg='light cyan')
        self.text_area.grid(row=1, column=1)

    def do_run(self):
        t = Thread(target=print_stuff)
        sys.stdout = StdoutDirector(self.text_area)
        # configure the nameless "root" logger to also write           # added
        # to the redirected sys.stdout                                 # added
        logger = logging.getLogger()                                   # added
        console = logging.StreamHandler(stream=sys.stdout)             # added
        logger.addHandler(console)                                     # added
        t.start()

def print_stuff():
    logger = logging.getLogger('print_stuff') # will inherit "root" logger settings
    logger.info('This will now show')                                  # changed
    print 'This will show'
    print_some_other_stuff()

def print_some_other_stuff():
    logger = logging.getLogger('print_some_other_stuff') # will inherit "root" logger settings
    logger.info('This will also now show')                             # changed
    print 'This will also show'

def main():
    logging.basicConfig(level=logging.INFO) # enable logging           # added
    root = Tk()
    app = App(root)
    root.mainloop()

if __name__=='__main__':
    main()
于 2013-02-14T23:09:39.223 回答