void CDlgDlg::OnButton7()
{
 CWnd * pEdit = GetDlgItem(IDC_EDIT1);
 if( NULL != pEdit)
 {
  CString str ;
  pEdit->GetWindowText(str);
  CFile file ;
  file.Open("d:\\1.txt",CFile::modeCreate|CFile::modeNoInherit|CFile::modeWrite);
  file.SeekToEnd();
  file.Write((LPCTSTR)str,str.GetLength());
  file.Close();
 }
}