对话框全屏显示

BOOL CDemoDlg::OnInitDialog()
{
 CDialog::OnInitDialog();

 // Add "About..." menu item to system menu.

 // IDM_ABOUTBOX must be in the system command range.
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
 ASSERT(IDM_ABOUTBOX < 0xF000);

 CMenu* pSysMenu = GetSystemMenu(FALSE);
 if (pSysMenu != NULL)
 {
  CString strAboutMenu;
  strAboutMenu.LoadString(IDS_ABOUTBOX);
  if (!strAboutMenu.IsEmpty())
  {
   pSysMenu->AppendMenu(MF_SEPARATOR);
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
  }
 }

 // Set the icon for this dialog.  The framework does this automatically
 //  when the application's main window is not a dialog
 SetIcon(m_hIcon, TRUE);   // Set big icon
 SetIcon(m_hIcon, FALSE);  // Set small icon
 
 //删除WS_CAPTION和WS_BORDER风格
 ModifyStyle(WS_CAPTION, 0);
 ModifyStyle(WS_BORDER, 0);

 //获得屏幕长度和高度
  int cx = GetSystemMetrics(SM_CXSCREEN);
  int cy = GetSystemMetrics(SM_CYSCREEN);

 //设置对话框位置和大小
  SetWindowPos(NULL, 0, 0 , cx, cy, SWP_NOZORDER);

 CRect rect;
 GetDlgItem(IDC_TEXT)->GetWindowRect(rect);
 GetDlgItem(IDC_TEXT)->MoveWindow(cx / 2 - rect.Width() / 2, cy / 2, cx / 2, cy / 2);

 return TRUE;
}