https://www.it610.com/article/1290488507772510208.htm
代理下载的脚本
https://mirror.nju.edu.cn/videolan-ftp/vlc/3.0.17/win32/
ok的demo
https://blog.csdn.net/xiaolong1126626497/article/details/115174182
qt布局
https://blog.csdn.net/llk15884975173/article/details/120323353
布局重要
setStretch