异常捕获

  showmessage('进入方法？这里是dll里LoginElecReq');
  try
  ShellExecute(Application.Handle, 'Open','prjGhMzPrePayPrint60.exe', PChar(pChargeSN), nil, SW_SHOWNORMAL);
  except
  on E:Exception do 
    showmessage(E.ClassName+':'+E.Message);
  end