Question

我正在使用Youtube（用于异步），htmlpy和pafy（以及youtube-dl）为trollius个视频制作小型下载程序。现在我有一个问题，一旦我点击下载按钮，在backend正在下载视频时，用户界面会冻结。

我试图让downloader类成为自己的主题并在UI旁边运行，但这似乎不起作用。我还尝试使用coroutine在UI继续时异步进行视频下载。似乎都没有用。

这是一些代码

class Downloader(htmlPy.Object,threading.Thread):
dd = os.path.join(os.getenv('USERPROFILE'), 'Downloads')  # dd = download director
dd = dd + "/vindownload/"

def __init__(self, app):
    threading.Thread.__init__(self)
    super(Downloader, self).__init__()
    # Initialize the class here, if required.
    self.app = app
    return

@htmlPy.Slot(str)
def download_single(self, json_data):
    form_data = json.loads(json_data)
    print json_data
    url = form_data["name"]
    dt = form_data["dt"]  # Download type is audio or video
    if url.__contains__("https://www.youtube.com/watch?v="):
        if dt == 'audio':
            print "hello1"
            loop = trollius.get_event_loop()
            loop.run_until_complete(self._downloadVid(url, vid=False))
            loop.stop()
        else:
            print "hello1"
            loop = trollius.get_event_loop()
            loop.run_until_complete(self._downloadVid(url, vid=True))
            loop.stop()
        self.app.evaluate_javascript("document.getElementById('form').reset()")
    else:
        print "Incorrect url"
    print form_data

 @trollius.coroutine
def _downloadVid(self, url, vid=False, order_reverse=False, vinName=None):
    print "hello123"
    video = pafy.new(url)
    print video
    name = u''.join(video.title).encode('utf8')
    name = re.sub("[<>:\"/\\|?*]", "", name)
    if not vid:
        file = video.getbestaudio()
    else:
        file = video.getbest()
    if (order_reverse):
        file.download(self.dd + vinName + name + ".mp4", quiet=False,callback=self.mycb)
    else:
        file.download(self.dd + name + ".mp4", quiet=False,callback=self.mycb)

def mycb(self,total, recvd, ratio, rate, eta):
    print(recvd, ratio, eta)

和我的initialize.py

BASE_DIR = os.path.abspath(os.path.dirname("initilize.py"))

app = htmlPy.AppGUI(title=u"Vin download", width=700, height=400, resizable=False)

app.static_path = os.path.join(BASE_DIR, "static/")
app.template_path = os.path.join(BASE_DIR, "templates/")

app.web_app.setMaximumWidth(830)
app.web_app.setMaximumHeight(600)

download  = Downloader(app)
download.start()

# Register back-end functionalities
app.bind(download)
app.template = ("./index.html", {"template_variable_name": "value"})

# Instructions for running application
if __name__ == "__main__":
    # The driver file will have to be imported everywhere in back-end.
    # So, always keep app.start() in if __name__ == "__main__" conditional
    app.start()

现在我的问题是。有没有办法让我可以在下载时释放UI，这样就不会让应用程序崩溃。

我正在使用：Python 2.7，Trollius，Pafy，Youtube-dl，HTMLPY。

感谢您的时间。

Answer 1

好吧，我找到了问题的答案，这就是我所做的。我将download_single方法更改为以下内容：

@htmlPy.Slot(str)
def download_single(self, json_data):
    form_data = json.loads(json_data)
    print json_data
    url = form_data["name"]
    dt = form_data["dt"]  # Download type is audio or video
    videoDown = videoDownload(url, dt, self.app, self.dd)
    videoDown.start()
    print form_data

我之前在其中的代码现在转移到一个名为videoDownload的新类，它采用上述所有属性。

videoDownload.py

class videoDownload(threading.Thread):
def __init__(self, url, dt, app, dd):
    threading.Thread.__init__(self)
    self.url = url
    self.dt = dt
    self.app = app
    self.dd = dd

def run(self):
    threads.append(self)
    if self.url.__contains__("https://www.youtube.com/watch?v="):
        if self.dt == 'audio':
            print "hello1"
            self._downloadVid(self.url, vid=False)
        else:
            print "hello1"
            self._downloadVid(self.url, vid=True)
    else:
        print "Incorrect url"

def _downloadVid(self, url, vid=False, order_reverse=False, vinName=None):
    print "hello123"
    video = pafy.new(url)
    print video
    name = u''.join(video.title).encode('utf8')
    name = re.sub("[<>:\"/\\|?*]", "", name)
    if not vid:
        file = video.getbestaudio()
    else:
        file = video.getbest()
    if (order_reverse):
        file.download(self.dd + vinName + name + ".mp4", quiet=False, callback=self.mycb)
    else:
        file.download(self.dd + name + ".mp4", quiet=False, callback=self.mycb)
    threads.remove(self)

def mycb(self, total, recvd, ratio, rate, eta):
    pass

这解决了我被封锁的问题。一旦离开run方法，线程将自行结束，并且它将从类上方定义的线程数组中删除。

度过美好的一天

〜Ellisan

如何阻止htmlpy ui阻止

1 个答案: