例1_1

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(
       HINSTANCE hInstance,
       HINSTANCE hPrevInstance,
       LPSTR lpCmdLine,
       int nShowCmd
       )
{
 HWND hwnd;
 MSG msg;
 char lpszClassName[]="窗口";
 WNDCLASS wc;
 wc.style=0;
 wc.lpfnWndProc=WndProc;
 wc.cbClsExtra=0;
 wc.cbWndExtra=0;
 wc.hInstance=hInstance;
 wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
 wc.hCursor=LoadCursor(NULL,IDC_ARROW);
 wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
 wc.lpszMenuName=NULL;
 wc.lpszClassName=lpszClassName;
 
 RegisterClass(&wc);
 
 hwnd=CreateWindow(
  lpszClassName,
  "windows",
  WS_OVERLAPPEDWINDOW,
  CW_USEDEFAULT,
  0,
  CW_USEDEFAULT,
  0,
  NULL,
  NULL,
  hInstance,
  NULL
  );
 
 ShowWindow(hwnd,nShowCmd); 
 UpdateWindow(hwnd);
 while (GetMessage(&msg,NULL,0,0))
 {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
 }
 
 
 return msg.wParam;//好像是判断代表你这个程序是否获取过消息
 
}

LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{

// int wmId,wmEvent;
 
 switch (message){
/*  case WM_COMMAND:
   wmId=LOWORD(wParam);
   wmEvent=HIWORD(wParam);
   switch (wmId)
   {
   case IDM_ABOUT:
    DialogBox(_hInst,"ABOUTBOX",hWnd,(DLGPROC)About);
    break;
   case IDM_EXIT:
    DestroyWindow(hWnd);
    break;
   default:
    return (DefWindowProc(hWnd,message,wParam,lParam));
   }
   break;
*/  
  case WM_DESTROY:
//   PostQuitMessage(0);  //该函数会返回一个wm_quit消息进入线程列队中等待getmessage抓到它在退出程序
   break;
  case WM_LBUTTONDOWN:
   MessageBox(hWnd,"hello",0,0);
   break;
/*  case WM_CLOSE:   //所谓的屏蔽close
   break;
*/  default:
   return DefWindowProc(hWnd,message,wParam,lParam);
   
 }
 return 0;
 
}