PySimpleGUIQt实现文件下载进度条触发AttributeError问题求助

PySimpleGUIQt未实现标准Tkinter版PySimpleGUI提供的write_event_value跨线程通信接口，这是你报错的直接原因。同时你的原代码还存在启动即重复触发下载、小文件下载时chunk_size为0、进度计数可能溢出等潜在问题。

import requests
import threading
import queue
import PySimpleGUIQt as sg
from math import floor
from tqdm import tqdm

# 初始化跨线程通信队列
progress_queue = queue.Queue()

header = {"Authorization": "token ghp_*****************************************",
          "Accept": "application/vnd.github.v4.raw"}
link_up = 'https://raw.githubusercontent.com/[user]/[repo]/[branch]/[file name]'

def download_file(link, f_name):
    resp = requests.get(link, headers=header, stream=True)
    total = int(resp.headers.get('content-length', 0))
    # 修复小文件时chunk_size为0的问题，最小设为1
    ceil_value = max(floor(total / 100), 1)
    with open(f_name, 'wb') as file, tqdm(desc=f_name, total=total, unit='iB', unit_scale=True, unit_divisor=ceil_value,) as bar:
        x_i = 0
        for data in resp.iter_content(chunk_size=ceil_value):
            size = file.write(data)
            bar.update(size)
            # 用队列替代write_event_value发进度
            progress_queue.put(('Next', min(x_i, 100)))
            x_i = x_i + 1
    # 发送下载完成信号
    progress_queue.put(('Finished', None))

sg.theme("DarkBlue")

progress_bar = [
    [sg.ProgressBar(100, size=(40, 20), pad=(0, 0), key='Progress Bar'),
     sg.Text("  0%", size=(4, 1), key='Percent')],
]

layout = [
    [sg.Button('Download')],
    [sg.Column(progress_bar, key='Progress')],
]
window = sg.Window('Title', layout, size=(520, 80), finalize=True, use_default_focus=False)

file_name = 'upload-launcher.exe'
# 去掉启动就自动开下载的冗余逻辑，避免未点按钮就开始下载
downloading = False

while True:
    # 给read加100ms超时，定期检查队列消息
    event, values = window.read(timeout=100)
    if event == sg.WINDOW_CLOSED:
        break

    if event == 'Download' and not downloading:
        downloading = True
        count = 0
        window['Progress Bar'].update(current_count=0, max=100)
        window['Percent'].update(value=f'  0%')
        thread = threading.Thread(target=download_file, args=(link_up, file_name), daemon=True)
        thread.start()
    
    # 检查队列里的进度消息
    while not progress_queue.empty():
        msg_type, msg_val = progress_queue.get()
        if msg_type == 'Next':
            count = msg_val
            window['Progress Bar'].update(current_count=count)
            window['Percent'].update(value=f'{count:>3d}%')
        elif msg_type == 'Finished':
            downloading = False
            print('Download Finished')
            sg.popup('下载完成', keep_on_top=True)

window.close()

• 用Python标准库queue.Queue实现跨线程通信，替代PySimpleGUIQt不支持的write_event_value方法
• 给window.read增加超时参数，定期拉取队列中的进度更新消息
• 增加下载状态锁，避免重复点击下载按钮触发多个下载线程
• 修复小文件场景下chunk_size为0的异常，进度值做上限限制避免超过100%
• 移除程序启动时自动触发下载的冗余逻辑，将下载完成提示移到实际下载结束节点

内容的提问来源于stack exchange，提问作者Ifan_Ifan