VC++ MFC文件拷贝显示进度条，选择需要复制的文件、选择需要复制到的路径，开始复制文件时即可显示进度条，进度条上显示有数字百分比，适时显示复制进度。-VC++ MFC file copy shows the progress bar, select files to be copied, the choice of paths need to be copied to the beginning, copying a file to display a progress bar, progr