用平台SDK编写的程序，表明了Windows程序运行原理及程序编写流程，句柄原理，示范了窗口产生过程，消息队列，回调函数，窗口关闭与应用程序退出.-Platform SDK with the preparation of the procedures, indicating that the Windows program to run the principle and procedure of the preparation process, handle the principle of the process demonstrated the window, message queues, callback function, the window to close and exit the application.