MFC中，编写单文档界面程序，当用户用鼠标单击程序窗口用户区时，在当前目录下，一只写方式创建一个名为“myfile.txt”的文件，并向其写入字符“hello，this is a file”-MFC, write a single document interface program, when the program window with the mouse click the user area, in the current directory, a write mode create

cmd命令：copy_b，将多个文件以二进制合并，得到一个文件。MFC开发成窗口界面，易使用。-cmd command: copy_b, merge multiple files in binary, get a file. MFC developed into a window interface, easy to use