m_pMainWnd->ShowWindow(SW_SHOW); 

m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);

m_pMainWnd->SetWindowPos(NULL,x,y,Width,Height,SWP_NOMOVE);

BOOL CDzyApp::InitInstance()
{
  AfxEnableControlContainer(); 
  …… 
  // The one and only window has been initialized, so show and update it.
  m_pMainWnd->SetWindowPos(NULL,0,0,750,555,SWP_NOMOVE);//设置窗口的初始大小为750*555
  m_pMainWnd->ShowWindow(SW_SHOW); 
  m_pMainWnd->UpdateWindow(); 
  return TRUE; 
}

m_pMainWnd->CenterWindow( GetDesktopWindow() );

CenterWindow( GetDesktopWindow() );

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{ 
  if (CFrameWnd::OnCreate(lpCreateStruct) == -1) 
  return -1; 
  …… 

  // TODO: Delete these three lines if you don't want the toolbar to 
  // be dockable 
  m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY); 
  EnableDocking(CBRS_ALIGN_ANY); 
  DockControlBar(&m_wndToolBar); 

  CenterWindow( GetDesktopWindow() ); //使窗口打开时处于屏幕正中

  return 0; 
}

BOOL CTextEditorDoc::OnNewDocument() 
{ 
  if (!CDocument::OnNewDocument()) 
    return FALSE; 
  // TODO: add reinitialization code here 
  // (SDI documents will reuse this document) 
  SetTitle("未命名.txt");  //设置文档标题
  return TRUE; 
}

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs) 
{ 
  if( !CFrameWnd::PreCreateWindow(cs) ) 
    return FALSE; 
  // TODO: Modify the Window class or styles here by modifying 
  // the CREATESTRUCT cs 
  m_strTitle = _T("文本整理器");  //设置程序标题
  return TRUE; 
}

AfxGetMainWnd()->SetWindowText("文档标题"+" - "+"程序标题");