...get the installed keyboard layouts?

procedure GetKLList(List: TStrings);
var
  AList : array [0..9] of Hkl;
  AklName: array [0..255] of Char;
  i: Longint;
begin
  List.Clear;
  for i := 0 to GetKeyboardLayoutList(SizeOf(AList), AList) - 1 do
    begin
      GetLocaleInfo(LoWord(AList[i]), LOCALE_SLANGUAGE, AklName, SizeOf(AklName));
      List.AddObject(AklName, Pointer(AList[i]));
    end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  GetKLList(ListBox1.Items);
end;

procedure TForm1.ListBox1Click(Sender: TObject);
begin
  with Sender as TListBox do
    ActivateKeyboardLayout(Hkl(Items.Objects[ItemIndex]), 0);
end;

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