多线程进度条(真正的多线程实现) 通过进行间通信，实现的真正的多线程进度条 数据处理与进度条界面处于不同的进程，真正实现进度条的多线程 -ultithreaded progress bar (true multithreading) By performing communication, to achieve real progress multithreading Data processing and the progress bar interface in a di