8,窗口類注冊：
atom registerclass(
  const wndclass *lpwndclass   // address of structure with class
                               // data
);

9，創建窗口：
hwnd createwindow(
  lpctstr lpclassname,  // pointer to registered class name
  lpctstr lpwindowname, // pointer to window name
  dword dwstyle,        // window style
  int x,                // horizontal position of window
  int y,                // vertical position of window
  int nwidth,           // window width
  int nheight,          // window height
  hwnd hwndparent,      // handle to parent or owner window
  hmenu hmenu,          // handle to menu or child-window identifier
  handle hinstance,     // handle to application instance
  lpvoid lpparam        // pointer to window-creation data
);

10,顯示和更新窗口窗口：
bool showwindow(
  hwnd hwnd,     // handle to window
  int ncmdshow   // show state of window
);
bool updatewindow(
  hwnd hwnd   // handle of window
);

11,消息循環：
msg msg;
while(getmessage(&msg,...))    //從消息隊列中取出一條消息
{
 translatemessage(&msg); //進行消息（如鍵盤消息）轉換
 dispatchmessage(&msg); //分派消息到窗口的回調函數處理,（os調用窗口回調函數進行處理）。
}

其中：
//**the getmessage function retrieves a message from the calling thread's message queue and places it in the specified structure.
//**if the function retrieves a message other than wm_quit, the return value is nonzero.if the function retrieves the wm_quit message, the return value is zero. if there is an error, the return value is -1.

bool getmessage(
  lpmsg lpmsg,         // address of structure with message
  hwnd hwnd,           // handle of window
  uint wmsgfiltermin,  // first message
  uint wmsgfiltermax   // last message
);

//the translatemessage function translates virtual-key messages into character messages. the character messages are posted to the calling thread's message queue, to be read the next time the thread calls the getmessage or peekmessage function.
bool translatemessage(
  const msg *lpmsg   // address of structure with message
);

//the dispatchmessage function dispatches a message to a window procedure.
long dispatchmessage(
  const msg *lpmsg   // pointer to structure with message
);

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