Connaitre le nom des Ports Com disponibles

uses registry;
...
procedure TForm1.Button1Click(Sender: TObject);
var
reg : TRegistry;
st : TStrings;
i : integer;

begin
reg := TRegistry.Create;
reg.RootKey := HKEY_LOCAL_MACHINE;
reg.OpenKey('hardware',false);
st := TStringList.Create;
reg.GetValueNames(st);
for i := 0 to st.Count -1 do begin
Memo1.Lines.Add(reg.ReadString(st.Strings[i]));
end;
st.Free;
reg.CloseKey;
reg.free;
end;