自己创建窗口类之后运行为什么闪一下就没有了

Question

在 CMainFrame（）中的precreatewindow中WNDCLASS wndcls；
         wndcls.cbWndExtra=0;
wndcls.cbClsExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_HELP);
wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
wndcls.hInstance=AfxGetInstanceHandle();
wndcls.lpfnWndProc=::DefWindowProc;
wndcls.lpszClassName=_T("Style");
wndcls.lpfnWndProc=NULL;
wndcls.style=CS_HREDRAW|CS_VREDRAW;
RegisterClass(&wndcls);
cs.lpszClass=L"Style";

Answer 1

LRESULT CALLBACK WindowProc(HWND   hwnd,
                             UINT   msg,
                             WPARAM wParam,
                             LPARAM lParam)
{switch(msg)
{
case WM_CREATE:
   {
      }break;
   case WM_DESTROY:
   {
    PostQuitMessage(0);
  
   }break;
default:
         DefWindowProc(hwnd,msg,wParam,lParam);
  
}
return (1);
}
int WINAPI WinMain(HINSTANCE hInstance,
       HINSTANCE hPrevInstance,
       LPSTR lpCmdLine,
       int nShowCmd)
{ 
MSG msg;
HWND hwnd;//创建窗口类WNDCLASSEX wndcls;wndcls.cbClsExtra=0;
wndcls.cbSize=sizeof(WNDCLASSEX);
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_ARROW);
wndcls.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndcls.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WindowProc;
wndcls.lpszClassName="Well";
wndcls.lpszMenuName=NULL;
wndcls.style=NULL;
//注册窗口类
if(!RegisterClassEx(&wndcls))
   return (0);//创建窗口if(!(hwnd=CreateWindowEx(NULL,"Well","well的窗口",NULL,100,100,300,300,NULL,NULL,hInstance,NULL)))
   return (0);//显示窗口ShowWindow(hwnd,nShowCmd);//更新窗口
UpdateWindow(hwnd);//消息循环while(true)
{   if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))
   {
   
    if(msg.message==WM_QUIT)
     break;
   
    TranslateMessage (&msg);
    DispatchMessage (&msg);
   }
}return msg.wParam;
}