tkinter实现下载进度条（python）

た入场券 2021-12-20 16:29 462阅读 0赞

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需求：

利用python爬取网站数据进行下载时，显示下载进度

# 设置下载进度条
    tk.Label(window, text='下载进度:').place(x=40, y=80)
    canvas = tk.Canvas(window, width=600, height=16, bg="white")
    canvas.place(x=20, y=90)
    # 下载按钮函数
    def usr_download():
        response = session.get(url_str, headers=headers2, cookies=cookies_xxx, verify=False, stream=True)  # stream=True表示请求成功后并不会立即开始下载，而是在调用iter_content方法之后才会开始下载
        chunk_size = 40960  # 设置每次下载的块大小
        content_size = int(m4a.headers['content-length'])  # 从返回的response的headers中获取文件大小
        # 填充进度条
        fill_line = canvas.create_rectangle(1.5, 1.5, 0, 23, width=0, fill="green")
        raise_data = 600 / (content_size/chunk_size)    # 增量大小，600为进度条的长度
    
        # 将下载的数据写入文件
        with open(title + '.m4a', 'wb') as f:
              n = 0
              for data in response.iter_content(chunk_size=chunk_size):  # 在循环读取文件时，刷新进度条  
                  f.write(data)
                  n = n + raise_data    
                  canvas.coords(fill_line, (0, 0, n, 60))
                  window.update()
    
    # 清空进度条
    def clean_progressbar():
        # 清空进度条
        fill_line = canvas.create_rectangle(1.5, 1.5, 0, 23, width=0, fill="white")
        x = 500  # 未知变量，可更改
        n = 600 / x  # 465是矩形填充满的次数
    
        for t in range(x):
            n = n + 600 / x
            # 以矩形的长度作为变量值更新
            canvas.coords(fill_line, (0, 0, n, 60))
            window.update()
    
    # 下载按钮
    btn_download = tk.Button(window, text='开始下载', command=usr_download)
    btn_download.place(x=600, y=28)

效果图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FzZGZnNjU0MQ_size_16_color_FFFFFF_t_70][]

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参考文章：

[https://www.twblogs.net/a/5bc3de452b717711c924f9a8/zh-cn][https_www.twblogs.net_a_5bc3de452b717711c924f9a8_zh-cn]

[https://blog.csdn.net/YiXiao1997/article/details/86721536][https_blog.csdn.net_YiXiao1997_article_details_86721536]

[Link 1]: http://www.mlzhilu.com/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FzZGZnNjU0MQ_size_16_color_FFFFFF_t_70]: /images/20211220/9d8bb1417d1f40b5a7fd5ccbf05af432.png
[https_www.twblogs.net_a_5bc3de452b717711c924f9a8_zh-cn]: https://www.twblogs.net/a/5bc3de452b717711c924f9a8/zh-cn
[https_blog.csdn.net_YiXiao1997_article_details_86721536]: https://blog.csdn.net/YiXiao1997/article/details/86721536