在 youtube 下载器 kivy 应用程序中没有响应

Question

我用Python写了这个程序：

import os
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from time import sleep
import pytube
import scrapetube
from pathlib import Path

save_addr = f"{os.environ['USERPROFILE']}\Downloads\Youtube DL"
print(save_addr)

layout = BoxLayout

def youtube_dl(video,addr):
        #yt = pytube.YouTube(f"{link.text}")
        #ys = yt.streams.get_highest_resolution()
        #ys.download()
        video = str(video.text)
        try:
            yt = pytube.YouTube(video)
            ys = yt.streams.get_highest_resolution()
            ys.download(output_path=addr)
        except pytube.exceptions.RegexMatchError:
            print('The Regex pattern did not return any matches for the video: {}'.format(video))          
        except pytube.exceptions.ExtractError:
            print('An extraction error occurred for the video: {}'.format(video))         
        except pytube.exceptions.VideoUnavailable:
            print('The following video is unavailable: {}'.format(video))

class cd:
    """Context manager for changing the current working directory"""
    def __init__(self, newPath):
        self.newPath = os.path.expanduser(newPath)

    def __enter__(self):
        self.savedPath = os.getcwd()
        os.chdir(self.newPath)

    def __exit__(self, etype, value, traceback):
        os.chdir(self.savedPath)


class MyGrid(layout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.orientation = "vertical"
        self.spacing = 20
        self.padding = [10, 10]
        self.cols = 1
        self.label = Label(text="Enter link of Video You Want to Download!")
        self.add_widget(self.label)
        self.link = TextInput(hint_text="Example: youtube.com/watch?v=MXDHK_MqRsk", multiline=False)
        self.add_widget(self.link)
        self.btn = Button(text="OK!")
        self.btn.bind(on_press=lambda x:self.callback())
        self.add_widget(self.btn)
        sleep(3)

    def callback(self):
        def dl(video,addr,DL=True):
            try:
                yt = pytube.YouTube(video)
                if DL:
                    ys = yt.streams.get_highest_resolution()
                    cd(addr)
                    ys.download(output_path=addr)
            except pytube.exceptions.RegexMatchError:
                print('The Regex pattern did not return any matches for the video: {}'.format(video))          
            except pytube.exceptions.ExtractError:
                print('An extraction error occurred for the video: {}'.format(video))         
            except pytube.exceptions.VideoUnavailable:
                print('The following video is unavailable: {}'.format(video))
            return yt
        video = str(self.link.text)
        title = str(dl(video,self.link,DL=False).title)
        self.label.text = f"Download : \"{title}\" , Save in:"
        self.link.text = f"{save_addr}"
        self.btn.text = "Download video!"
        self.btn.bind(on_press=lambda x:dl(video,self.link.text))

class MyKivy(App):
        def build(self):
            return MyGrid()

if __name__ == "__main__":
    MyKivy().run()

我的问题是，当我把视频 link 放到程序中并点击下载时，从 YouTube 下载视频时，显示没有响应的消息，但下载完成后，程序returns 正常：

image of this error

如何防止显示未响应的消息？

Answer 1

为了防止这种情况，您必须使用多线程，这意味着您可以同时执行多项任务，这将防止 UI 冻结，因为它运行在与下载器运行正在运行的同一线程中。您将像这样在线程中为运行下载器创建一个函数：

import threading
def run_thread(self,*args):
    thread_dl = thrading.Thread(target = self.downloader,args = (arg1,arg2,arg3))
    thread_dl.start()

您将把此函数编辑为按钮 on_press 函数

在 youtube 下载器 kivy 应用程序中没有响应

not responding in youtube downloader kivy app

python

kivy

pytube