将命令行结果重定向到tkinter GUI

我创建了一个在命令行上打印结果的程序.(它是服务器,它在命令行上打印日志.)

现在,我希望看到与GUI相同的结果.

如何将命令行结果重定向到GUI？

请提出一个技巧,以便轻松将控制台应用程序转换为简单的GUI.

请注意,它应该适用于Linux和Windows.

您可以创建一个脚本包装器,将命令行程序作为子进程运行,然后将输出添加到文本小部件之类的内容中.

from tkinter import *
import subprocess as sub
p = sub.Popen('./script',stdout=sub.PIPE,stderr=sub.PIPE)
output, errors = p.communicate()

root = Tk()
text = Text(root)
text.pack()
text.insert(END, output)
root.mainloop()

脚本是你的程序.显然,你可以用不同的颜色或类似的颜色打印错误.

要在GUI 仍在运行时在GUI中显示子进程的输出,在Python 2和3上都可以使用的便携式stdlib解决方案必须使用后台线程:

#!/usr/bin/python
"""
- read output from a subprocess in a background thread
- show the output in the GUI
"""
import sys
from itertools import islice
from subprocess import Popen, PIPE
from textwrap import dedent
from threading import Thread

try:
    import Tkinter as tk
    from Queue import Queue, Empty
except ImportError:
    import tkinter as tk # Python 3
    from queue import Queue, Empty # Python 3

def iter_except(function, exception):
    """Works like builtin 2-argument `iter()`, but stops on `exception`."""
    try:
        while True:
            yield function()
    except exception:
        return

class DisplaySubprocessOutputDemo:
    def __init__(self, root):
        self.root = root

        # start dummy subprocess to generate some output
        self.process = Popen([sys.executable, "-u", "-c", dedent("""
            import itertools, time

            for i in itertools.count():
                print("%d.%d" % divmod(i, 10))
                time.sleep(0.1)
            """)], stdout=PIPE)

        # launch thread to read the subprocess output
        #   (put the subprocess output into the queue in a background thread,
        #    get output from the queue in the GUI thread.
        #    Output chain: process.readline -> queue -> label)
        q = Queue(maxsize=1024)  # limit output buffering (may stall subprocess)
        t = Thread(target=self.reader_thread, args=[q])
        t.daemon = True # close pipe if GUI process exits
        t.start()

        # show subprocess' stdout in GUI
        self.label = tk.Label(root, text="  ", font=(None, 200))
        self.label.pack(ipadx=4, padx=4, ipady=4, pady=4, fill='both')
        self.update(q) # start update loop

    def reader_thread(self, q):
        """Read subprocess output and put it into the queue."""
        try:
            with self.process.stdout as pipe:
                for line in iter(pipe.readline, b''):
                    q.put(line)
        finally:
            q.put(None)

    def update(self, q):
        """Update GUI with items from the queue."""
        for line in iter_except(q.get_nowait, Empty): # display all content
            if line is None:
                self.quit()
                return
            else:
                self.label['text'] = line # update GUI
                break # display no more than one line per 40 milliseconds
        self.root.after(40, self.update, q) # schedule next update

    def quit(self):
        self.process.kill() # exit subprocess if GUI is closed (zombie!)
        self.root.destroy()


root = tk.Tk()
app = DisplaySubprocessOutputDemo(root)
root.protocol("WM_DELETE_WINDOW", app.quit)
# center window
root.eval('tk::PlaceWindow %s center' % root.winfo_pathname(root.winfo_id()))
root.mainloop()

解决方案的本质是:

将子进程输出放入后台线程的队列中

从GUI线程中获取队列的输出.

即,process.readline()在主线程中调用后台线程 - >队列 - >更新GUI标签.相关kill-process.py(无轮询 - event_generate在后台线程中使用的不太便携的解决方案).