1）窗體上放一個button，一個memo；

2）button的click事件中寫如下程式碼： 

procedure TfrmMain.Button1Click(Sender: TObject);
var
  reg: TRegistry;
  ts: TStrings;
  i: integer;
begin
  reg := TRegistry.Create;
  reg.RootKey := HKEY_LOCAL_MACHINE;
  reg.OpenKey('hardware\devicemap\serialcomm', false);
  ts := TStringList.Create;
  reg.GetValueNames(ts);
  memo1.Lines.AddStrings(ts);
  for i := 0 to ts.Count - 1 do
  begin
    Memo1.Lines.Add(reg.ReadString(ts.Strings[i]));
  end;
  ts.Free;
  reg.CloseKey;
  reg.free;
end;