需要帮助从 python 项目中的 pygtk GUI 实时捕获 STDOUT

发布于 2024-11-05 20:05:09 字数 1588 浏览 6 评论 0原文

我正在开发一个项目，我想在 python pygtk GUI 中使用命令行实用程序 cdparanoia。我正在使用 Glade 进行 UI 开发。我尝试导入 subprocess 并使用 subprocess.Popen。它可以工作，但在进程执行时它会冻结我的 GUI（甚至不允许重新绘制窗口）。对于用户来说这不是一个很好的交互。我怎样才能防止这种行为？我想在窗口上放置一个取消按钮，但这会起作用，因为它会“冻结”程序。最终，我想捕获stderr（如下所示，音频信息通过stdout传输到sox）并将其呈现为gtk.Expander，当它安装程序时，用户能够看到它，其外观与Synaptic类似事情是实时发生的。另外，我想使用进度指示器中的文本（如下所示）来构建真正的进度指示器小部件。如何让 shell 实时将信息传递回 python，而不是在进程完成后（当它将所有信息作为一个大的信息转储提供时）？

需要捕获的实时信息：

Working on me - me - DISK 01.flac
cdparanoia III release 10.2 (September 11, 2008)

Ripping from sector       0 (track  1 [0:00.00])
      to sector  325195 (track 15 [1:56.70])

outputting to stdout

 (== PROGRESS == [>                             | 004727 00 ] == :-) O ==)

这是我迄今为止使用的代码：

        quick = " -Z" if self.quick == True else ""
        command = "cdparanoia -w%s 1- -| sox -t wav - \"%s - %s - DISK %s%s.flac\"" %\
                    (
                        quick,
                        self.book_name.replace(" ", "_"),
                        self.author_name.replace(" ", "_"),
                        "0" if disc < 10 else "", 
                        disc
                    )
        print command
        shell = subprocess.Popen(command, shell=True, executable="/bin/bash",
                                    stdin=subprocess.PIPE,
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE
                                )
        data, err = shell.communicate(command)

谢谢，纳尼

原文

I am working on a project in which I want to use the command line utility cdparanoia from a python pygtk GUI. I'm using Glade for UI development. I have tried importing subprocess and using subprocess.Popen. It works, but it freezes my GUI (won't even allow repainting of the windows) while the process is executing. Not a very nice interaction for the user. How can I prevent this behaviour? I would like put a cancel button on the window but this would work as it "freezes" the program. Ultimately, I would like to capture stderr (as below, audio info is piped to sox via stdout) and present it in as a gtk.Expander with a similar look to Synaptic when it is installing a program with the ability of the user to see things happening in real time. Also, I would like to use the text from the progress indicator (as seen below) to build a real progress indicator widget. How can I get a shell to pass info back to python in real-time rather than once the process is finished (when it gives it all as one big info dump)?

Real-time info needing captured:

Working on me - me - DISK 01.flac
cdparanoia III release 10.2 (September 11, 2008)

Ripping from sector       0 (track  1 [0:00.00])
      to sector  325195 (track 15 [1:56.70])

outputting to stdout

 (== PROGRESS == [>                             | 004727 00 ] == :-) O ==)

Here is the code I've used so far:

        quick = " -Z" if self.quick == True else ""
        command = "cdparanoia -w%s 1- -| sox -t wav - \"%s - %s - DISK %s%s.flac\"" %\
                    (
                        quick,
                        self.book_name.replace(" ", "_"),
                        self.author_name.replace(" ", "_"),
                        "0" if disc < 10 else "", 
                        disc
                    )
        print command
        shell = subprocess.Popen(command, shell=True, executable="/bin/bash",
                                    stdin=subprocess.PIPE,
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE
                                )
        data, err = shell.communicate(command)

With Thanks,
Narnie

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指尖上得阳光 2024-11-12 20:05:09

我曾经编写过一个 Python shell 实现，它确实运行了 wget 和具有完整功能输出的实际 Python 控制台。

您需要使用subprocess.Popen并直接写入sys.stdout：

process = subprocess.Popen(shlex.split(command), stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
complete = False

while True:
  output = process.stdout.read(1)

  if output == '' and process.poll() != None:
    break

  if output != '':
    sys.stdout.write(output)
    sys.stdout.flush()

I wrote a Python shell implementation once, and it did run wget and the actual Python console with fully functional output.

You need to use subprocess.Popen and write directly to sys.stdout:

process = subprocess.Popen(shlex.split(command), stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
complete = False

while True:
  output = process.stdout.read(1)

  if output == '' and process.poll() != None:
    break

  if output != '':
    sys.stdout.write(output)
    sys.stdout.flush()

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演多会厌 2024-11-12 20:05:09

如果您编写一个从文件句柄读取的 GUI 程序，则需要使用调度程序将文件描述符事件集成到 GUI 事件循环中。事件循环的一般描述可以在 Wikipedia 中找到。 Gtk+的具体描述可以参见参考。

问题的解决方案：使用函数 g_io_add_watch 将您的操作集成到主事件循环中。这里是一个 C 语言的示例。Python 应该是类似的。

回复收藏 0 原文

迎风吟唱 2024-11-12 20:05:09

是的，这里有两个问题。
首先，您需要指定读取超时，以便
在子进程完成之前您不会阻塞。
第二个是可能发生不希望的缓冲。

解决第一个问题，从子进程异步读取
你可以尝试我的 subProcess 模块，但有超时：
http://www.pixelbeat.org/libs/subProcess.py
请注意，这很简单，但也很旧并且仅限 Linux。
它被用作新的 python subprocess 模块的基础，
所以如果你需要便携性，你最好选择它。

要了解/控制可能发生的任何额外缓冲，请参阅：
http://www.pixelbeat.org/programming/stdio_buffering/