多线程 进度条 并行运行 自动更新进度 MFC VC++编程-Run in parallel multi-threaded progress bar automatically updates the progress of MFC VC++ programming

mfc实现带进度条的文件拷贝功能，可以显示拷贝进度-mfc VC++ MFC file copy shows the progress bar, files to be copied, the choice of paths need to be copied to the beginning, copying a file to display a progress bar, progress bar displayed on a digital display percentage, th