multithreading - 如何使用wxpython线程来防止阻塞主循环

Question

我正在做一个学校项目，在 python 平台上开发一个定制的媒体播放器。问题是当我使用 time.sleep(duration) 时，它会阻塞我的 GUI 的主循环，阻止它更新。我咨询过我的主管并被告知使用多线程，但我不知道如何使用线程。有人会建议我如何在下面的场景中实现线程吗？

---

代码:

def load_playlist(self, event):
    playlist = ["D:\Videos\test1.mp4", "D:\Videos\test2.avi"]
    for path in playlist:
        #calculate each media file duration
        ffmpeg_command = ['C:\\MPlayer-rtm-svn-31170\\ffmpeg.exe', '-i' , path]

        pipe = subprocess.Popen(ffmpeg_command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        results = pipe.communicate()

        #Regular expression to get the duration
        length_regexp = 'Duration: (\d{2}):(\d{2}):(\d{2})\.\d+,'
        re_length = re.compile(length_regexp)

        # find the matches using the regexp that to compare with the buffer/string
        matches = re_length.search(str(results))
        #print matches

        hour = matches.group(1)
        minute = matches.group(2)
        second = matches.group(3)

        #Converting to second
        hour_to_second = int(hour) * 60 * 60
        minute_to_second = int(minute) * 60
        second_to_second = int(second)

        num_second = hour_to_second + minute_to_second + second_to_second
        print num_second

        #Play the media file
        trackPath = '"%s"' % path.replace("\\", "/")
        self.mplayer.Loadfile(trackPath)

        #Sleep for the duration of second(s) for the video before jumping to another video
        time.sleep(num_second) #THIS IS THE PROBLEM#

Answer 1

您可能想看看 wxPython wiki，其中有几个使用线程、队列和其他有趣事物的示例:

• http://wiki.wxpython.org/LongRunningTasks
• http://wiki.wxpython.org/Non-Blocking%20Gui

我还在这里写了一个关于这个主题的教程:http://www.blog.pythonlibrary.org/2010/05/22/wxpython-and-threads/

要记住的主要事情是，当您使用线程时，您不能直接调用您的 wx 方法(即 myWidget.SetValue 等)。相反，您需要使用 wxPython 线程安全方法之一:wx.CallAfter、wx.CallLater 或 wx.PostEvent