MFC流方式对文件的读写

void CTxtView::OnFileWrite()
{
 // TODO: Add your command handler code here
 CFile file("c:\\1.txt",CFile::modeCreate||CFile::modeWrite);
 CArchive ar(&file,CArchive::store);
 CString str="123";
// ar<<str;
// ar.Flush();
 file.Write("123",3);
 ar.Close();
 file.Close();
}

void CTxtView::OnFileRead()
{
 // TODO: Add your command handler code here
 CString ch;
 CFile file;
 CFileException fe;
 if (!file.Open("c:\\1.txt",CFile::modeRead,&fe))
 {
  fe.ReportError();
  return;
 }
 CArchive ar(&file,CArchive::load);
 ar>>ch;
 MessageBox(ch);
 ar.Flush();
  ar.Close();
  file.Close();
  }